Question about 2002 Jeep Grand Cherokee

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2002 Grand Cherokee heater warm on drivers side cold on passanger

My 2002 Grand Cherokee has climate control, the heat works OK on the drivers side but blows cold air on passenagers side. It's not a setting on the control.

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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)

Posted on Jan 23, 2009

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2002 jeep grand cherokee drivers heated seat quit working! elments or control module? swtich lights


Hi before making a suggestion, It would be nice to know if only the drivers sest is affected, or is the passanger side also affecte. This will permit in analysing if it is the element or the module. Thanks for the additional information

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I have a 2003 Jeep Grand Cherokee Overland with automatic climate control. The drivers side blows cold air constantly. It has no heat.


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Heating system


This is obviously a heater system control problem, I beleive this system is vaccuum controled with vacuum acuators that open and close doors in response to the climate control system comands.

Listen for the sound of escaping air from under the dash board, esp on the drivers side. Look for any unattached hoses under the dash. From there if you do not see anything obvious, you will have to obtain a schematic of the HVAC system, understand it's opearation and then start testing the vacuum control devices. maybe more than you want to do.

Goos Luck

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the main issue with this is either the thermostat or the climate control switch I do not know if your climate control switch is electronic or manual either way I would start out with the cheapest and go with the thermostat first good luck!

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I believe its the adjuster doors. It is electonically turned from cold to hot and doors are probably seized. Its a very expensive fix, cost me over 1000.

good luck, its the first of many heater problems.

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