Question about 1998 Jeep Grand Cherokee
It sounds to me as if you have a mode door that is broken inside the heater box...the only way to really tell that is to take it to your mechanic and have them scan the heater control module and extrct codes...one code should should mode door range too large...then you will have an idea...your mechanic should also perform a blend door recalibration...again, values will come up on the screen...as long as you some values you're okay...if there is a blend door, you will see one door at like 560 degrees, while other doors will be at 90, 45, 60 etc....as long as they stay reasonable and aren't excessive like the first one...good luck...the recalibration just might work to clear all codes and to get your heater working again...if not, then you will need to pull your dash and heater box....dealerships charge 10.0 to 12.0 hours labour just for that...sorry dude.
try the blend door recalibration first...take it to your mechanic...try that.
Posted on Nov 19, 2009
This is usually due to a vacuum leak. Check under the hood near the firewall and make sure there are no broken/disconnected vacuum lines. Most likely your problem is here. If you have no visible leaks underhood, you will have to make you way under the dashboard and check there. If everything is fine, the final loss of vacuum will be in the "blend door actuator", which is a vacuum operated motor. The underdash stuff is not easy to do, so unless you're up for it, have someone else do it for you.
Posted on Nov 19, 2009
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Posted on Jan 02, 2017
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