Question about Jeep Cars & Trucks
The heater was all fine before I had the spark plugs serviced. It was blowing out cold air, then a little bit warm air, then went back to cold air again. Tried all settings. Could it be the mechanics forgot to hook up something that they took off when service the spark plugs? Thanks.
My guess would be that the thermostat is stuck in the open position causing this problem.
Posted on Nov 01, 2012
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Posted on Jan 02, 2017
Can't tell you exactly what is wrong but the one thing you said is of concern...Map sensor should not be full of oil. If it is, I'd want to know why. In finding the reason for that, you may also find the reason why you are having a problem.
Jeep uses two kinds of engine crank venting. you either have a pcv valve or an orifice controlled system. If either are obstructed it can overpressure the crankcase and cause all kinds of problems.
Years of experience tells me this isn't something I can guess at and be 100% sure I have the right answer but based on what you said, I'd look there first!
Posted on Feb 07, 2010
Jeeps are notorious for having broken temperature control (Blend Air) doors. A malfunctioning Blend Air Door actuator probably caused it to break. The dash will have to be removed to replacethe door and the door actuator.
Posted on Jan 16, 2011
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