Question about 2004 Jeep Grand Cherokee

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Heat not working

My 2004 Jeep Grand Cherokee with 6 cyl engine has no heat. Car warms up and operates at normal temp but heat just blows cold. Fan works - any Idea what I can check.

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  • Anonymous Mar 31, 2014

    ENGINE STALLS UPON SLOWING DOWN OR AT FULL STOP

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If jeep is a limited model it has automatic temp control for the heater blend door, it is controled by a electric motor, and can be problematic with age,sometimes it makes a clicking noise when the blend door is stiff ,which then it must be lubed and freed up

Posted on Mar 08, 2009

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Either the heater core is plugged or partially plugged, the heater control valve is not opening completely or the thermostat isn't allowing the engine to warm as much as it should. Even though the engine seems warm enough, if the thermostat isn't working properly you may not be all the way up to temperature. 


Posted on Mar 05, 2009

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Most likely the internal blend doors are broken check a common defect on jeeps out the site www.heatertreater.net for more info

Posted on Dec 03, 2009

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1 Answer

2004 Jeep Grand Cherokee temp gauge high when heat is on


If your "check engine" light is turn on, I suggest scanned the PCM to know exactly what fault code is stored there. Additionally, could be some problem with the "temp sending unit".

Keep us updated.

Jan 23, 2012 | 2004 Jeep Grand Cherokee

1 Answer

My jeep is not getting warm. The temp gauge is not even getting to the middle temp where it is supposed to be. The heat doesn't blow warm from the vents even on high and all the way hot.


Two reasons that the temp won't come up...Most common is that your thermostat is stuck open. There are tests to check that but the stat is inexpensive and relatively easy to replace. Use a 195 degree (f) and make sure that you put the new one in the same way the old one came out (spring end into the engine) make sure all gasket material has been removed or it will leak and use 50/50 mix of coolant to replace any lost while working. (system does not need to be drained to do that job but you will loose some) re-fill with heater on full heat, engine running.
The other possibility is that your electric fan is always on. If the fan is running with the engine cold, replace the relay (usually found behind and below R/F headlight, accessible from under vehicle with a little work.)

Dec 13, 2010 | 2004 Jeep Grand Cherokee

1 Answer

My 1998 Jeep Grand Cherokee is over heating and I have already replaced the water pump. Someone told me it might be the heat censor. Could this be right and if so how much is it going to cost me.


Be careful, with engine at normal oper. temp. feel both upper and lower radiator hoses, they should both feel the same, warm to hot, if not the same temp. replace the thermostat.Heat sensor either work's or not, if it reads hot, engine is hot, or will not work at all.

Sep 01, 2010 | 1998 Jeep Cherokee

1 Answer

2000 Jeep Grand Cherokee, heater wont blow heat!


Check the thermastat or your cooling fan to make sure all is working good. If your engine cant warm up, you will not produce any heat inside the car

Feb 04, 2010 | 2000 Jeep Grand Cherokee

1 Answer

My heater fan turns on before the car has warmed up. It blows cold air? Any ideas why?


After warmup it still blows cold, or only when cold? Normally the fan will operate independently of engine temp except in some climate controlled vehicles. As long as it blows warm air after engine is at temp that's a good thing. the heater uses hot water from the engine. Obviously the heater can't be warm before the engine is. If it's cold after the engine is hot, there are vacuum controlled "motors" on top of the heater box under the dash that move doors that control heat. Either one of the control motors or one of the doors have stuck or failed. Many also have a control valve on one of the heater hoses under the hood as well. If the engine comes up to temp then the thermostat is good (should be at about 210f) Only remaining item is the core itself which may be internally or externally obstructed.
All this being said, if it's good when the engine is up to temp, leave it alone...it's fine.

Nov 30, 2009 | 1996 Jeep Grand Cherokee

1 Answer

No heat bought heater treater what does code 14 mean?


1st, what is 'heater treater?' Is this something you add to the cooling system? Is your engine temp gauge in the normal range, or is the jeep running at the cold end of the temp. gauge? Is the fan for the heat/and a/c working? There are several reasons you may not have heat.
1.make sure coolant level is ok, low level will cause a no heat condition.2. If engine is not warming up properly (running at the cold side of temp gauge), you may have a thermostat that's stuck open, not allowing the engine to reach operating temp-result, no heat.3. If you can hear the fan blowing for the heat-a/c, but not feel it blowing at the vents, your 'blender door' (opens and closes to allow heat-a/c to enter the cabin) may be stuck closed. I had a Jeep (4L engine, but older than yours) which had a valve in the heater hose line that once froze up (stuck closed) and resulted in a no heat situation. If the heater treater is something you add to the radiator, I wouldn't waste the $ to use it, as it probably won't help this problem. Your codes: I could find no code 54, #14 is 'B' camshaft position sensor -timing over advanced, or system performance bank 1.

Nov 17, 2009 | 2001 Jeep Grand Cherokee

3 Answers

My 02 Jeep Grand Cherokee stright 6 cyl keeps over heating!!!


Usually the electric fan(s) are temperature activated. I would look into the temp switch. If you're not sure what it is, go to the auto parts place and ask for one. This way you can look at it then hunt for it under the hood. It usually screws into the engine in the cooling system. Also, make sure the fan has a good ground. Check for power to the fan when the engine warms up. If you have a/c, turn it on and the fan should come on whether the engine is warm or not.

Hope this helps. Good Luck

Mar 13, 2009 | 2002 Jeep Grand Cherokee

2 Answers

No heat


sounds like an air lock joe

Nov 22, 2008 | 2001 Jeep Grand Cherokee

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