Question about 1999 Jeep Grand Cherokee

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Heating system I have a 1999 jeep gran cherokee with dual climate control system but when i turn on the heater, it blows cold air towards the passenger side but the driver side get heat. Can anyone tells me what's the problem is?

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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

Posted on Feb 09, 2009

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