Question about 2003 Jeep Grand Cherokee

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I have a 2003 cherokee laredo that keeps blowing air out of the defroster vents. Occasionally it goes back to the fron vents, but soon switches back to defrosters. The air is cold, so no problem with that.

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  • Richard Scordino May 12, 2010

    There are vacuum operated doors inside the heater box. likely either on of the doors is sticking, one of the "motors" are bad or the vacuum supply to them has been compromised.

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If you have a manual control , you may a a vaccum leak at the firewall under the hood. when you give it gas and the vents go from the floor to defrost . listen for hissing, and cracked / broken vaccum lines

Posted on May 13, 2010

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1 Answer

2002 jeep laredo interior vents won't blow except


The mode control on your heater panel uses engine vacuum to operate the doors in the heater box. when the system loses vacuum, it defaults to the defrost setting. find the small plastic vacuum line that penetrates the firewall and leads to the engine intake manifold. Check the hose that attaches the line to the engine for cracking or looseness. If that is OK, trace the line back into the cabin. It should lead to the control panel. Check any tees or couplings for leakage. If it's good all the way to the mode control switch, it is likely the connection to the switch or the switch itself is leaking. With the engine running, listen carefully to the switch for hissing. It is also possible that the defrost door actuator is bad. If you can find the door, try applying vacuum directly to the actuator to see if it operates to shift the flow. If it doesn't, replace the actuator.

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You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.

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