Question about 2001 Jeep Grand Cherokee

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2001 Grand Cherokee Heat on one side cold air on the other side?

When I turned the heater on my side set at 72 was blowing good warm air. The passenger side set at 72 also was blowing cold air. I turned the temp. controle on my side to 68 It turned cold. But when I turn the dile on passenger side it dosen't change?This is a limited with duel tempeture for each driver and passenger. Gene in KY.

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  • MRichInCalif Nov 26, 2008

    I have the same problem (2001 Jeep GC & passenger side blows cold as driver's side blows warm) but my mechanic just called & is appalled 'cos it looks like a $900 job to him & he is used to bringing in the final total at much, much less on repairs. He said it looks like he'll have to pull the entire dash. Is this an expensive job normally? Any suggestions? Thanks.

  • Anonymous Jan 14, 2009

    I have a 2000 model that only blows cold air on the passenger side while blowing warm on the drivers side. I'm pretty handy but am not sure if this is a do it yourself fix or not. Thoughts???

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The blend door on the passenger side has broken. Jeep has made a replacement section for the heater box assembly so you don't have to buy the whole thing. You will need to remove the heater/A/C box to replace the part. I have done quite a few of these repairs to fix the problem

Posted on Nov 22, 2008

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Common Jeep problem. Blend doors are either jammed or broken. Dashboard removal is require to repair.

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Why would my 2002 Jeep Grand Cherokee only blow luke-warm to cold air when the fan is on high? First the heat went on the highest setting, so i used the second highest. Then it started to coll as...


Sounds like you need a blower motor resistor located down under dash on pass side next to blower motor. This is a comon problem and I have changed many of them. thats just the fan speed problem. Ive seen the blend doors break easily on those jeeps. thats inside the heaer core box and moves the flap from hot air to cold air. If it is stuck halfway -or mostly to cold- you may only get luke warm air. If they had the heater core out-maybe they possibly broke it.

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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.

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I have a 2001 Jeep Grand Cherokee. Originally blew only cold air no matter what the heat settings were at. Then blower stopped working. Discovered wires were corroded and replaced them as well installed...


either bad recirc doors or a possible bad heater core. Open the hood and when the car is warmed up to mid point on the temp gauge look on the passenger's side firewall under the hood. You will see 2 black rubber hoses running through the firewall. Feel each hose and if one of the 2 are cold then you have a bad heater core. Otherwise most likely the recirc door.

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Apr 30, 2009 | 2001 Jeep Grand Cherokee

1 Answer

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generally this is caused by a "blend door " motor (actually a vacuum control) not working. I don't have a diagram on this but if you watch the motors mounted to the heater box under the dash, and operate the control, you likely will find one not moving (check all positions including a/c)

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