The heater blows cold air
#1
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Model: Cherokee
The heater blows cold air
I have a 2001 Cherokee Sport with the 4.0L 6 cylinder motor. This is my first winter with the rig and the other day I noticed the heater isn't blowing cold air. I have tried to trouble shoot this a bit, all the fluids are topped off at the appropriate levels and when the car is warm the engine temperature is in the appropriate range. It seemed like the A/C clutch might not have been disengaging, so I pulled the fuses to the A/C system to take it offline but it still blew cold-warmish air. I figure it must either be the thermostat or the heater core. Anyone have any suggestions on the best way to trouble shoot this before I start taring my motor apart? Thanks.
#3
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Year: 1999
Model: Cherokee
Engine: 4.0
I have a 2001 Cherokee Sport with the 4.0L 6 cylinder motor. This is my first winter with the rig and the other day I noticed the heater isn't blowing cold air. I have tried to trouble shoot this a bit, all the fluids are topped off at the appropriate levels and when the car is warm the engine temperature is in the appropriate range. It seemed like the A/C clutch might not have been disengaging, so I pulled the fuses to the A/C system to take it offline but it still blew cold-warmish air. I figure it must either be the thermostat or the heater core. Anyone have any suggestions on the best way to trouble shoot this before I start taring my motor apart? Thanks.
What exactly do you want your AC/Heat system to do?
#4
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Year: 2001
Model: Cherokee
Engine: 4.0
Try flushing out the heater core. There are 2 hoses that go from the firewall along side the valve cover and into the thermostat housing. Stick a hose into one and flush all the crappy out.
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#8
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Year: 1996, 1990
Model: Cherokee
Engine: 4.0
I had that same problem in my "96. I just took the return side hose off the heater core at the fire wall, inserted a bike tire pump hose (with the end removed) and pumped hard a few times. It loosened the crud and allowed the fluid to flow through the heater core. Problem fixed and its been good for 2 yrs now.
#9
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Year: 2001
Model: Cherokee
Engine: 4.0L
I have the same problem with mine all of a sudden. Was working great a week ago and now it's warmish. Not hot. What's weird about mine tho is when I am driving it heats up good. When idling you can feel the temp cool down. I have noticed my temp gauge is a slight bit cooler than normal also. A few months ago I had replaced the thermostat and radiator. Did a flush on the system and added new hoses and fluid. Another weird thing it just recently did is my ac stopped blowing really cold too. I had just recharged the system a few months ago. Was working great. The cooler lines under the good are still ice cold tho. Just not in the cab. Anyone have any ideas? Lol
#11
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this.
if BOTH arent hot to the touch, it confirms the heater core blockage.
i have to do flush my heater core on my 98 every winter for the last 3 winters, im too lazy to change it out.
warm the motor, undo the hoses at the motor, flush the core, pour the rad flush chemical in, let it sit, flush and reverse flush
if BOTH arent hot to the touch, it confirms the heater core blockage.
i have to do flush my heater core on my 98 every winter for the last 3 winters, im too lazy to change it out.
warm the motor, undo the hoses at the motor, flush the core, pour the rad flush chemical in, let it sit, flush and reverse flush
#12
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Year: 2001
Model: Cherokee
Engine: 4.0L
this. if BOTH arent hot to the touch, it confirms the heater core blockage. i have to do flush my heater core on my 98 every winter for the last 3 winters, im too lazy to change it out. warm the motor, undo the hoses at the motor, flush the core, pour the rad flush chemical in, let it sit, flush and reverse flush
#13
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Year: 1998 Sport
Model: Cherokee
Engine: 4.0
Yes Sir! The garden hose should be fine unless the heater core is already bad and getting ready to leak. Not a whole lot you can do, If it leaks when you flush it was only a matter of time before it started to leak on it's own.
#15
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