My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
it is always running at the very end of the green band in the
winter and last summer was on the H line. After driving it I can
hear the coolant bubbling in the system and the radiator cap will
have it's vent popped. I have replaced the water pump, fan
clutch, hoses, temperature sending unit, temperature gauge in
spedo cluster, 15# radiator cap, thermostat housing, thermostat
(using 160 now, only way to "keep it in the green") and had
radiator steam cleaned. It still seams to be running hot even in
Kansas City's 20-30 F weather we are having now. I don't see any
coolant in the oil and there doesn't seem to be any burn off.

I did have to run a wire direct from the sending unit to the
gauge - my Painless harness has a break in the temp wire (not
that it matters). I do not have a fan shroud. I have run out of
things to replace and I am still running hot. My only thoughts
are that my aftermarket products are causing to much heat in the
combustion chamber or to much carbon build-up inside the engine.

Thoughts?

Also - I am planning on the 4.0 head swap in the near future -
any suggestions on where to get a head and what casting I should
look for?

Thanks for looking
Brad

P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
headers, GM HEI distributor, stock heat range spark plugs, aprox
95,000 miles.

 

Put the fan shroud back on, the shroud will make a big difference at idle
and low speed.
-Brian

"brad smith" <bradley_k_smith@hotmaill.com> wrote in message
news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
: My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
: it is always running at the very end of the green band in the
: winter and last summer was on the H line. After driving it I can
: hear the coolant bubbling in the system and the radiator cap will
: have it's vent popped. I have replaced the water pump, fan
: clutch, hoses, temperature sending unit, temperature gauge in
: spedo cluster, 15# radiator cap, thermostat housing, thermostat
: (using 160 now, only way to "keep it in the green") and had
: radiator steam cleaned. It still seams to be running hot even in
: Kansas City's 20-30 F weather we are having now. I don't see any
: coolant in the oil and there doesn't seem to be any burn off.
:
: I did have to run a wire direct from the sending unit to the
: gauge - my Painless harness has a break in the temp wire (not
: that it matters). I do not have a fan shroud. I have run out of
: things to replace and I am still running hot. My only thoughts
: are that my aftermarket products are causing to much heat in the
: combustion chamber or to much carbon build-up inside the engine.
:
: Thoughts?
:
: Also - I am planning on the 4.0 head swap in the near future -
: any suggestions on where to get a head and what casting I should
: look for?
:
: Thanks for looking
: Brad
:
: P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
: headers, GM HEI distributor, stock heat range spark plugs, aprox
: 95,000 miles.
:
:

 

Put the fan shroud back on, the shroud will make a big difference at idle
and low speed.
-Brian

"brad smith" <bradley_k_smith@hotmaill.com> wrote in message
news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
: My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
: it is always running at the very end of the green band in the
: winter and last summer was on the H line. After driving it I can
: hear the coolant bubbling in the system and the radiator cap will
: have it's vent popped. I have replaced the water pump, fan
: clutch, hoses, temperature sending unit, temperature gauge in
: spedo cluster, 15# radiator cap, thermostat housing, thermostat
: (using 160 now, only way to "keep it in the green") and had
: radiator steam cleaned. It still seams to be running hot even in
: Kansas City's 20-30 F weather we are having now. I don't see any
: coolant in the oil and there doesn't seem to be any burn off.
:
: I did have to run a wire direct from the sending unit to the
: gauge - my Painless harness has a break in the temp wire (not
: that it matters). I do not have a fan shroud. I have run out of
: things to replace and I am still running hot. My only thoughts
: are that my aftermarket products are causing to much heat in the
: combustion chamber or to much carbon build-up inside the engine.
:
: Thoughts?
:
: Also - I am planning on the 4.0 head swap in the near future -
: any suggestions on where to get a head and what casting I should
: look for?
:
: Thanks for looking
: Brad
:
: P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
: headers, GM HEI distributor, stock heat range spark plugs, aprox
: 95,000 miles.
:
:

 

Put the fan shroud back on, the shroud will make a big difference at idle
and low speed.
-Brian

"brad smith" <bradley_k_smith@hotmaill.com> wrote in message
news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
: My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
: it is always running at the very end of the green band in the
: winter and last summer was on the H line. After driving it I can
: hear the coolant bubbling in the system and the radiator cap will
: have it's vent popped. I have replaced the water pump, fan
: clutch, hoses, temperature sending unit, temperature gauge in
: spedo cluster, 15# radiator cap, thermostat housing, thermostat
: (using 160 now, only way to "keep it in the green") and had
: radiator steam cleaned. It still seams to be running hot even in
: Kansas City's 20-30 F weather we are having now. I don't see any
: coolant in the oil and there doesn't seem to be any burn off.
:
: I did have to run a wire direct from the sending unit to the
: gauge - my Painless harness has a break in the temp wire (not
: that it matters). I do not have a fan shroud. I have run out of
: things to replace and I am still running hot. My only thoughts
: are that my aftermarket products are causing to much heat in the
: combustion chamber or to much carbon build-up inside the engine.
:
: Thoughts?
:
: Also - I am planning on the 4.0 head swap in the near future -
: any suggestions on where to get a head and what casting I should
: look for?
:
: Thanks for looking
: Brad
:
: P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
: headers, GM HEI distributor, stock heat range spark plugs, aprox
: 95,000 miles.
:
:

 

Double check that you don't have the reversed water pump made for
the serpentine belt.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

brad smith wrote:
>
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.

 

Double check that you don't have the reversed water pump made for
the serpentine belt.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

brad smith wrote:
>
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.

 

Double check that you don't have the reversed water pump made for
the serpentine belt.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

brad smith wrote:
>
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.

 

My 84 did the same thing after a 3" body lift and removing the shroud... I
had to modify the shroud to amke it fit after the body lift... but it now
runs cool...

Dennis Gann


"brad smith" <bradley_k_smith@hotmaill.com> wrote in message
news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.
>
>

 

My 84 did the same thing after a 3" body lift and removing the shroud... I
had to modify the shroud to amke it fit after the body lift... but it now
runs cool...

Dennis Gann


"brad smith" <bradley_k_smith@hotmaill.com> wrote in message
news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.
>
>

 

My 84 did the same thing after a 3" body lift and removing the shroud... I
had to modify the shroud to amke it fit after the body lift... but it now
runs cool...

Dennis Gann


"brad smith" <bradley_k_smith@hotmaill.com> wrote in message
news:5%DVb.30285$2h.25705@twister.rdc-kc.rr.com...
> My 4.2 in my '81 CJ-7 is running hot. According to my Temp gauge
> it is always running at the very end of the green band in the
> winter and last summer was on the H line. After driving it I can
> hear the coolant bubbling in the system and the radiator cap will
> have it's vent popped. I have replaced the water pump, fan
> clutch, hoses, temperature sending unit, temperature gauge in
> spedo cluster, 15# radiator cap, thermostat housing, thermostat
> (using 160 now, only way to "keep it in the green") and had
> radiator steam cleaned. It still seams to be running hot even in
> Kansas City's 20-30 F weather we are having now. I don't see any
> coolant in the oil and there doesn't seem to be any burn off.
>
> I did have to run a wire direct from the sending unit to the
> gauge - my Painless harness has a break in the temp wire (not
> that it matters). I do not have a fan shroud. I have run out of
> things to replace and I am still running hot. My only thoughts
> are that my aftermarket products are causing to much heat in the
> combustion chamber or to much carbon build-up inside the engine.
>
> Thoughts?
>
> Also - I am planning on the 4.0 head swap in the near future -
> any suggestions on where to get a head and what casting I should
> look for?
>
> Thanks for looking
> Brad
>
> P.S. 258 w/ Holley 2bbl 500cfm carb, Clifford intake, headman
> headers, GM HEI distributor, stock heat range spark plugs, aprox
> 95,000 miles.
>
>