95 Sahara coolant not circulating
 

Good Morning.

My 95 Sahara 4.0 has a circulation problem. As I type this it is at the
mechanic having a new water pump put on. I just spoke to him and he
agreed there was a circulation problem. I did the thermostat, and the
radiator is almost new. Could the impeller in the pump be damaged? He
said they don't fail very often. If it a blockage in the engine, how do
you remedy that? Would a system flush remove any obstructions? HELP!

Thanks,

Greg

Re: 95 Sahara coolant not circulating
 

There are 'two' versions of the waterpump. I have seen the correct box
have the wrong pump inside.

You need a waterpump that specifically says 'reverse rotation' on it.
It usually has a 'REV' cast into it's snout or at least an arrow
pointing counterclockwise.

It also is 'not' unusual to get a bad thermostat right out of the box.
At one point I was using a pot of hot water to test the damn things
before installing.

I have also been told, but don't know this for sure, that if you
manually 'try out' the new thermostat with your fingers, you can blow
the seal on the wax container or introduce an air bubble to it so it
won't work properly. As I say, this could be 'an old wives tale', I do
not know.

I have also seen a pump impeller let go from the shaft, but then it got
'way' hotter than you report. You 'must' still have 'some' circulation.

One other one is the bottom rad hose is supposed to have a spring inside
it or it can suck closed when hot restricting the flow.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)


jerryg wrote:
>
> Good Morning.
>
> My 95 Sahara 4.0 has a circulation problem. As I type this it is at the
> mechanic having a new water pump put on. I just spoke to him and he
> agreed there was a circulation problem. I did the thermostat, and the
> radiator is almost new. Could the impeller in the pump be damaged? He
> said they don't fail very often. If it a blockage in the engine, how do
> you remedy that? Would a system flush remove any obstructions? HELP!
>
> Thanks,
>
> Greg

Re: 95 Sahara coolant not circulating
 

There are 'two' versions of the waterpump. I have seen the correct box
have the wrong pump inside.

You need a waterpump that specifically says 'reverse rotation' on it.
It usually has a 'REV' cast into it's snout or at least an arrow
pointing counterclockwise.

It also is 'not' unusual to get a bad thermostat right out of the box.
At one point I was using a pot of hot water to test the damn things
before installing.

I have also been told, but don't know this for sure, that if you
manually 'try out' the new thermostat with your fingers, you can blow
the seal on the wax container or introduce an air bubble to it so it
won't work properly. As I say, this could be 'an old wives tale', I do
not know.

I have also seen a pump impeller let go from the shaft, but then it got
'way' hotter than you report. You 'must' still have 'some' circulation.

One other one is the bottom rad hose is supposed to have a spring inside
it or it can suck closed when hot restricting the flow.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)


jerryg wrote:
>
> Good Morning.
>
> My 95 Sahara 4.0 has a circulation problem. As I type this it is at the
> mechanic having a new water pump put on. I just spoke to him and he
> agreed there was a circulation problem. I did the thermostat, and the
> radiator is almost new. Could the impeller in the pump be damaged? He
> said they don't fail very often. If it a blockage in the engine, how do
> you remedy that? Would a system flush remove any obstructions? HELP!
>
> Thanks,
>
> Greg

Re: 95 Sahara coolant not circulating
 

There are 'two' versions of the waterpump. I have seen the correct box
have the wrong pump inside.

You need a waterpump that specifically says 'reverse rotation' on it.
It usually has a 'REV' cast into it's snout or at least an arrow
pointing counterclockwise.

It also is 'not' unusual to get a bad thermostat right out of the box.
At one point I was using a pot of hot water to test the damn things
before installing.

I have also been told, but don't know this for sure, that if you
manually 'try out' the new thermostat with your fingers, you can blow
the seal on the wax container or introduce an air bubble to it so it
won't work properly. As I say, this could be 'an old wives tale', I do
not know.

I have also seen a pump impeller let go from the shaft, but then it got
'way' hotter than you report. You 'must' still have 'some' circulation.

One other one is the bottom rad hose is supposed to have a spring inside
it or it can suck closed when hot restricting the flow.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)


jerryg wrote:
>
> Good Morning.
>
> My 95 Sahara 4.0 has a circulation problem. As I type this it is at the
> mechanic having a new water pump put on. I just spoke to him and he
> agreed there was a circulation problem. I did the thermostat, and the
> radiator is almost new. Could the impeller in the pump be damaged? He
> said they don't fail very often. If it a blockage in the engine, how do
> you remedy that? Would a system flush remove any obstructions? HELP!
>
> Thanks,
>
> Greg

Re: 95 Sahara coolant not circulating
 

Hi Mike, I am just finding out about this. Thanks again for the advice.
It is all making sense now. Thank you.

Greg
Mike Romain wrote:
> There are 'two' versions of the waterpump. I have seen the correct box
> have the wrong pump inside.
>
> You need a waterpump that specifically says 'reverse rotation' on it.
> It usually has a 'REV' cast into it's snout or at least an arrow
> pointing counterclockwise.
>
> It also is 'not' unusual to get a bad thermostat right out of the box.
> At one point I was using a pot of hot water to test the damn things
> before installing.
>
> I have also been told, but don't know this for sure, that if you
> manually 'try out' the new thermostat with your fingers, you can blow
> the seal on the wax container or introduce an air bubble to it so it
> won't work properly. As I say, this could be 'an old wives tale', I do
> not know.
>
> I have also seen a pump impeller let go from the shaft, but then it got
> 'way' hotter than you report. You 'must' still have 'some' circulation.
>
> One other one is the bottom rad hose is supposed to have a spring inside
> it or it can suck closed when hot restricting the flow.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
>
> jerryg wrote:
> >
> > Good Morning.
> >
> > My 95 Sahara 4.0 has a circulation problem. As I type this it is at the
> > mechanic having a new water pump put on. I just spoke to him and he
> > agreed there was a circulation problem. I did the thermostat, and the
> > radiator is almost new. Could the impeller in the pump be damaged? He
> > said they don't fail very often. If it a blockage in the engine, how do
> > you remedy that? Would a system flush remove any obstructions? HELP!
> >
> > Thanks,
> >
> > Greg

Re: 95 Sahara coolant not circulating
 

Hi Mike, I am just finding out about this. Thanks again for the advice.
It is all making sense now. Thank you.

Greg
Mike Romain wrote:
> There are 'two' versions of the waterpump. I have seen the correct box
> have the wrong pump inside.
>
> You need a waterpump that specifically says 'reverse rotation' on it.
> It usually has a 'REV' cast into it's snout or at least an arrow
> pointing counterclockwise.
>
> It also is 'not' unusual to get a bad thermostat right out of the box.
> At one point I was using a pot of hot water to test the damn things
> before installing.
>
> I have also been told, but don't know this for sure, that if you
> manually 'try out' the new thermostat with your fingers, you can blow
> the seal on the wax container or introduce an air bubble to it so it
> won't work properly. As I say, this could be 'an old wives tale', I do
> not know.
>
> I have also seen a pump impeller let go from the shaft, but then it got
> 'way' hotter than you report. You 'must' still have 'some' circulation.
>
> One other one is the bottom rad hose is supposed to have a spring inside
> it or it can suck closed when hot restricting the flow.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
>
> jerryg wrote:
> >
> > Good Morning.
> >
> > My 95 Sahara 4.0 has a circulation problem. As I type this it is at the
> > mechanic having a new water pump put on. I just spoke to him and he
> > agreed there was a circulation problem. I did the thermostat, and the
> > radiator is almost new. Could the impeller in the pump be damaged? He
> > said they don't fail very often. If it a blockage in the engine, how do
> > you remedy that? Would a system flush remove any obstructions? HELP!
> >
> > Thanks,
> >
> > Greg

Re: 95 Sahara coolant not circulating
 

Hi Mike, I am just finding out about this. Thanks again for the advice.
It is all making sense now. Thank you.

Greg
Mike Romain wrote:
> There are 'two' versions of the waterpump. I have seen the correct box
> have the wrong pump inside.
>
> You need a waterpump that specifically says 'reverse rotation' on it.
> It usually has a 'REV' cast into it's snout or at least an arrow
> pointing counterclockwise.
>
> It also is 'not' unusual to get a bad thermostat right out of the box.
> At one point I was using a pot of hot water to test the damn things
> before installing.
>
> I have also been told, but don't know this for sure, that if you
> manually 'try out' the new thermostat with your fingers, you can blow
> the seal on the wax container or introduce an air bubble to it so it
> won't work properly. As I say, this could be 'an old wives tale', I do
> not know.
>
> I have also seen a pump impeller let go from the shaft, but then it got
> 'way' hotter than you report. You 'must' still have 'some' circulation.
>
> One other one is the bottom rad hose is supposed to have a spring inside
> it or it can suck closed when hot restricting the flow.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
>
> jerryg wrote:
> >
> > Good Morning.
> >
> > My 95 Sahara 4.0 has a circulation problem. As I type this it is at the
> > mechanic having a new water pump put on. I just spoke to him and he
> > agreed there was a circulation problem. I did the thermostat, and the
> > radiator is almost new. Could the impeller in the pump be damaged? He
> > said they don't fail very often. If it a blockage in the engine, how do
> > you remedy that? Would a system flush remove any obstructions? HELP!
> >
> > Thanks,
> >
> > Greg

Re: 95 Sahara coolant not circulating
 

Insufficient coolant, poorly maintained coolant ,and/or the wrong coolant
can allow cavitation damage the impeller or eat through the impeller
material.

http://i112.photobucket.com/albums/n...g?t=1166286225


"jerryg" <Gregginn7@msn.com> wrote in message
news:1166285261.644578.283610@f1g2000cwa.googlegro ups.com...
> Hi Mike, I am just finding out about this. Thanks again for the advice.
> It is all making sense now. Thank you.
>
> Greg
> Mike Romain wrote:
>> There are 'two' versions of the waterpump. I have seen the correct box
>> have the wrong pump inside.
>>
>> You need a waterpump that specifically says 'reverse rotation' on it.
>> It usually has a 'REV' cast into it's snout or at least an arrow
>> pointing counterclockwise.
>>
>> It also is 'not' unusual to get a bad thermostat right out of the box.
>> At one point I was using a pot of hot water to test the damn things
>> before installing.
>>
>> I have also been told, but don't know this for sure, that if you
>> manually 'try out' the new thermostat with your fingers, you can blow
>> the seal on the wax container or introduce an air bubble to it so it
>> won't work properly. As I say, this could be 'an old wives tale', I do
>> not know.
>>
>> I have also seen a pump impeller let go from the shaft, but then it got
>> 'way' hotter than you report. You 'must' still have 'some' circulation.
>>
>> One other one is the bottom rad hose is supposed to have a spring inside
>> it or it can suck closed when hot restricting the flow.
>>
>> Mike
>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> 88 Cherokee 235 BFG AT's
>> Canadian Off Road Trips Photos: Non members can still view!
>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>> (More Off Road album links at bottom of the view page)
>>
>>
>> jerryg wrote:
>> >
>> > Good Morning.
>> >
>> > My 95 Sahara 4.0 has a circulation problem. As I type this it is at the
>> > mechanic having a new water pump put on. I just spoke to him and he
>> > agreed there was a circulation problem. I did the thermostat, and the
>> > radiator is almost new. Could the impeller in the pump be damaged? He
>> > said they don't fail very often. If it a blockage in the engine, how do
>> > you remedy that? Would a system flush remove any obstructions? HELP!
>> >
>> > Thanks,
>> >
>> > Greg
>

Re: 95 Sahara coolant not circulating
 

Insufficient coolant, poorly maintained coolant ,and/or the wrong coolant
can allow cavitation damage the impeller or eat through the impeller
material.

http://i112.photobucket.com/albums/n...g?t=1166286225


"jerryg" <Gregginn7@msn.com> wrote in message
news:1166285261.644578.283610@f1g2000cwa.googlegro ups.com...
> Hi Mike, I am just finding out about this. Thanks again for the advice.
> It is all making sense now. Thank you.
>
> Greg
> Mike Romain wrote:
>> There are 'two' versions of the waterpump. I have seen the correct box
>> have the wrong pump inside.
>>
>> You need a waterpump that specifically says 'reverse rotation' on it.
>> It usually has a 'REV' cast into it's snout or at least an arrow
>> pointing counterclockwise.
>>
>> It also is 'not' unusual to get a bad thermostat right out of the box.
>> At one point I was using a pot of hot water to test the damn things
>> before installing.
>>
>> I have also been told, but don't know this for sure, that if you
>> manually 'try out' the new thermostat with your fingers, you can blow
>> the seal on the wax container or introduce an air bubble to it so it
>> won't work properly. As I say, this could be 'an old wives tale', I do
>> not know.
>>
>> I have also seen a pump impeller let go from the shaft, but then it got
>> 'way' hotter than you report. You 'must' still have 'some' circulation.
>>
>> One other one is the bottom rad hose is supposed to have a spring inside
>> it or it can suck closed when hot restricting the flow.
>>
>> Mike
>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> 88 Cherokee 235 BFG AT's
>> Canadian Off Road Trips Photos: Non members can still view!
>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>> (More Off Road album links at bottom of the view page)
>>
>>
>> jerryg wrote:
>> >
>> > Good Morning.
>> >
>> > My 95 Sahara 4.0 has a circulation problem. As I type this it is at the
>> > mechanic having a new water pump put on. I just spoke to him and he
>> > agreed there was a circulation problem. I did the thermostat, and the
>> > radiator is almost new. Could the impeller in the pump be damaged? He
>> > said they don't fail very often. If it a blockage in the engine, how do
>> > you remedy that? Would a system flush remove any obstructions? HELP!
>> >
>> > Thanks,
>> >
>> > Greg
>

Re: 95 Sahara coolant not circulating
 

Insufficient coolant, poorly maintained coolant ,and/or the wrong coolant
can allow cavitation damage the impeller or eat through the impeller
material.

http://i112.photobucket.com/albums/n...g?t=1166286225


"jerryg" <Gregginn7@msn.com> wrote in message
news:1166285261.644578.283610@f1g2000cwa.googlegro ups.com...
> Hi Mike, I am just finding out about this. Thanks again for the advice.
> It is all making sense now. Thank you.
>
> Greg
> Mike Romain wrote:
>> There are 'two' versions of the waterpump. I have seen the correct box
>> have the wrong pump inside.
>>
>> You need a waterpump that specifically says 'reverse rotation' on it.
>> It usually has a 'REV' cast into it's snout or at least an arrow
>> pointing counterclockwise.
>>
>> It also is 'not' unusual to get a bad thermostat right out of the box.
>> At one point I was using a pot of hot water to test the damn things
>> before installing.
>>
>> I have also been told, but don't know this for sure, that if you
>> manually 'try out' the new thermostat with your fingers, you can blow
>> the seal on the wax container or introduce an air bubble to it so it
>> won't work properly. As I say, this could be 'an old wives tale', I do
>> not know.
>>
>> I have also seen a pump impeller let go from the shaft, but then it got
>> 'way' hotter than you report. You 'must' still have 'some' circulation.
>>
>> One other one is the bottom rad hose is supposed to have a spring inside
>> it or it can suck closed when hot restricting the flow.
>>
>> Mike
>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> 88 Cherokee 235 BFG AT's
>> Canadian Off Road Trips Photos: Non members can still view!
>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>> (More Off Road album links at bottom of the view page)
>>
>>
>> jerryg wrote:
>> >
>> > Good Morning.
>> >
>> > My 95 Sahara 4.0 has a circulation problem. As I type this it is at the
>> > mechanic having a new water pump put on. I just spoke to him and he
>> > agreed there was a circulation problem. I did the thermostat, and the
>> > radiator is almost new. Could the impeller in the pump be damaged? He
>> > said they don't fail very often. If it a blockage in the engine, how do
>> > you remedy that? Would a system flush remove any obstructions? HELP!
>> >
>> > Thanks,
>> >
>> > Greg
>