Heater Blowing Cold air
06-12-2009, 11:48 PM
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Model: Cherokee
Heater Blowing Cold air
the heater in my 1990 jeep cherokee seems to be blowing cold air, and everyone is telling me its my heater core but not only have a checked it i have also replaced it and it still gives me the same result 
... What should i be doing to find out what is wrong with my jeep
... What should i be doing to find out what is wrong with my jeep
Last edited by cnewitt; 12-24-2009 at 03:19 PM.
06-13-2009, 12:14 AM
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Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
Is your radiator full of coolant? Thermostat OK? Temp gauage coming up to 200 degrees or so? No air pockets in the system? Good radiator cap?
Heater hoses hooked up correctly? Are they getting hot? Water control valve working?
Good insulation on heater case blend doors? Blend doors working properly?
Temp control panel working properly?
Heater hoses hooked up correctly? Are they getting hot? Water control valve working?
Good insulation on heater case blend doors? Blend doors working properly?
Temp control panel working properly?
06-17-2009, 02:02 PM
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Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
If you have Jeep dealership in your area, that hasn't gone out of business yet, call them. Check local parts houses. Or go find one in a salvage yard.
06-17-2009, 02:28 PM
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Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
It's the water control valve on the hose over the fan motor, passenger side, vacuum activated. Try to vacuum it directly from the intake manifold, and see what happens. U probably have a leak where the pipeline enters the vacuum tank (behind the bumper) where it goes through the frame under the light housing.
Google "1990 cherokee vacuum diagram" for the diagram.
Google "1990 cherokee vacuum diagram" for the diagram.
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06-18-2009, 10:52 AM
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Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
Thats true, but the OP didn't say that his Jeep was that way. If it was, he probably wouldn't be too worried about a cold heater, right?
Either he or someone else could read your post, do the mod as you suggested, and then spend many hours and $$$$ trying to "fix" the A/C.
My point is, be careful what you post.
Either he or someone else could read your post, do the mod as you suggested, and then spend many hours and $$$$ trying to "fix" the A/C.
My point is, be careful what you post.
06-18-2009, 02:05 PM
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Year: 1985
Model: Cherokee
Engine: 2.5L Carb
If he is worried about cold air coming from the heater...than I helped him solve his issue....
He doesn't make any mention anything about a/c
He doesn't make any mention anything about a/c
06-18-2009, 03:14 PM
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Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
The great majority of Cherokees came with A/C and doors.
Therefore, friendly advice should be tailored to the normal, majority setup.
Just sayin'.
07-27-2009, 05:45 PM
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Model: Cherokee
Thank you all for your replies, and while looking at all this i learned thats its not my heater blowing cold air ... nothing works.... its only blowing the temp of air from outside the car, doesnt matter what im on, what may cuase this issue?
Last edited by cnewitt; 07-28-2009 at 11:03 AM.