Re: 2005 Grand Cherokee heater fan control failure
 

Hi Don,
Air-conditioning compressor normally cycles off and on. There are both a
high pressure and low pressure safety switches that are designed to save the
pump if one happens. You may be low on Refrigerant R134a, that may be
checked with a gauge: http://www.----------.com/temp/r12gauge.jpg The low
side should read a little higher than R12. This real should be done by a
licensed tech.
God Bless America, Bill O|||||||O
mailto:--------------------


"Don Pritchett" <dpritchett@optonline.net> wrote in message
news:yvoYh.19$2f5.18@newsfe12.lga...
> On my 2005 (of course out of warranty) Grand Cherokee, I'm experiencing
> intermittent failure of the HVAC fan low speed circuit and, it appears the
> HVAC compressor clutch activation. It won't work for a while, then, it
> "heals" itself.
>
> I see in the owners' manual that there are 2 relays and 1 fuse associated
> with HVAC controls, I'm betting on one of the relays......would this
> indicate an overload of some kind?
>
> Any suggestions would be appreciated!
>
> Thanks,
>
> Don
>
>



--
Posted via a free Usenet account from http://www.teranews.com

Re: 2005 Grand Cherokee heater fan control failure
 

a scan for fault codes would be the best first step then you would have a
better idea whats up

Don Pritchett wrote:

> On my 2005 (of course out of warranty) Grand Cherokee, I'm experiencing
> intermittent failure of the HVAC fan low speed circuit and, it appears the
> HVAC compressor clutch activation. It won't work for a while, then, it
> "heals" itself.
>
> I see in the owners' manual that there are 2 relays and 1 fuse associated
> with HVAC controls, I'm betting on one of the relays......would this
> indicate an overload of some kind?
>
> Any suggestions would be appreciated!
>
> Thanks,
>
> Don

Re: 2005 Grand Cherokee heater fan control failure
 

a scan for fault codes would be the best first step then you would have a
better idea whats up

Don Pritchett wrote:

> On my 2005 (of course out of warranty) Grand Cherokee, I'm experiencing
> intermittent failure of the HVAC fan low speed circuit and, it appears the
> HVAC compressor clutch activation. It won't work for a while, then, it
> "heals" itself.
>
> I see in the owners' manual that there are 2 relays and 1 fuse associated
> with HVAC controls, I'm betting on one of the relays......would this
> indicate an overload of some kind?
>
> Any suggestions would be appreciated!
>
> Thanks,
>
> Don

Re: 2005 Grand Cherokee heater fan control failure
 

a scan for fault codes would be the best first step then you would have a
better idea whats up

Don Pritchett wrote:

> On my 2005 (of course out of warranty) Grand Cherokee, I'm experiencing
> intermittent failure of the HVAC fan low speed circuit and, it appears the
> HVAC compressor clutch activation. It won't work for a while, then, it
> "heals" itself.
>
> I see in the owners' manual that there are 2 relays and 1 fuse associated
> with HVAC controls, I'm betting on one of the relays......would this
> indicate an overload of some kind?
>
> Any suggestions would be appreciated!
>
> Thanks,
>
> Don

Re: 2005 Grand Cherokee heater fan control failure
 

a scan for fault codes would be the best first step then you would have a
better idea whats up

Don Pritchett wrote:

> On my 2005 (of course out of warranty) Grand Cherokee, I'm experiencing
> intermittent failure of the HVAC fan low speed circuit and, it appears the
> HVAC compressor clutch activation. It won't work for a while, then, it
> "heals" itself.
>
> I see in the owners' manual that there are 2 relays and 1 fuse associated
> with HVAC controls, I'm betting on one of the relays......would this
> indicate an overload of some kind?
>
> Any suggestions would be appreciated!
>
> Thanks,
>
> Don

Re: 2005 Grand Cherokee heater fan control failure
 

philthy wrote:
> a scan for fault codes would be the best first step then you would
> have a better idea whats up
>
> Don Pritchett wrote:
>
>> On my 2005 (of course out of warranty) Grand Cherokee, I'm
>> experiencing intermittent failure of the HVAC fan low speed circuit
>> and, it appears the HVAC compressor clutch activation. It won't
>> work for a while, then, it "heals" itself.
>>
>> I see in the owners' manual that there are 2 relays and 1 fuse
>> associated with HVAC controls, I'm betting on one of the
>> relays......would this indicate an overload of some kind?
>>
>> Any suggestions would be appreciated!

The compressor clutch will disengage if the system is under or
over pressure. Check the electrical connectors on the pump
(high side limit) and the accumulator (low side limit) and make
sure they are clean.


--
DougW

Re: 2005 Grand Cherokee heater fan control failure
 

philthy wrote:
> a scan for fault codes would be the best first step then you would
> have a better idea whats up
>
> Don Pritchett wrote:
>
>> On my 2005 (of course out of warranty) Grand Cherokee, I'm
>> experiencing intermittent failure of the HVAC fan low speed circuit
>> and, it appears the HVAC compressor clutch activation. It won't
>> work for a while, then, it "heals" itself.
>>
>> I see in the owners' manual that there are 2 relays and 1 fuse
>> associated with HVAC controls, I'm betting on one of the
>> relays......would this indicate an overload of some kind?
>>
>> Any suggestions would be appreciated!

The compressor clutch will disengage if the system is under or
over pressure. Check the electrical connectors on the pump
(high side limit) and the accumulator (low side limit) and make
sure they are clean.


--
DougW

Re: 2005 Grand Cherokee heater fan control failure
 

philthy wrote:
> a scan for fault codes would be the best first step then you would
> have a better idea whats up
>
> Don Pritchett wrote:
>
>> On my 2005 (of course out of warranty) Grand Cherokee, I'm
>> experiencing intermittent failure of the HVAC fan low speed circuit
>> and, it appears the HVAC compressor clutch activation. It won't
>> work for a while, then, it "heals" itself.
>>
>> I see in the owners' manual that there are 2 relays and 1 fuse
>> associated with HVAC controls, I'm betting on one of the
>> relays......would this indicate an overload of some kind?
>>
>> Any suggestions would be appreciated!

The compressor clutch will disengage if the system is under or
over pressure. Check the electrical connectors on the pump
(high side limit) and the accumulator (low side limit) and make
sure they are clean.


--
DougW

Re: 2005 Grand Cherokee heater fan control failure
 

philthy wrote:
> a scan for fault codes would be the best first step then you would
> have a better idea whats up
>
> Don Pritchett wrote:
>
>> On my 2005 (of course out of warranty) Grand Cherokee, I'm
>> experiencing intermittent failure of the HVAC fan low speed circuit
>> and, it appears the HVAC compressor clutch activation. It won't
>> work for a while, then, it "heals" itself.
>>
>> I see in the owners' manual that there are 2 relays and 1 fuse
>> associated with HVAC controls, I'm betting on one of the
>> relays......would this indicate an overload of some kind?
>>
>> Any suggestions would be appreciated!

The compressor clutch will disengage if the system is under or
over pressure. Check the electrical connectors on the pump
(high side limit) and the accumulator (low side limit) and make
sure they are clean.


--
DougW