Question about 1998 Jeep Grand Cherokee

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Only get heat out of floor vents. dash and defrost blows cool air

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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

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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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1 Answer

I have a 1975 k5 blazer and it blows cold air it worked fine last year but now it only blows cold air even on the defrost setting what can the problem be and how can I fix it?


A vent flap actuator probably needs to be replaced. It's what moves your vent flaps from heat to A/C or to plain "vent air" when you change settings.

The discussion in the link includes vent flap actuators. Unfortunately, they also include the infamous no low speed fan problem too.

Cannot get any air from dash vents while defrost and floor vents work fine...

Your particular actuator will be a different one than they found.
They're all a absolute pain to get at because they can be well buried in the dash. I would start looking under the dash on the passenger side, that's where most of the air control is. Cannot get any air from dash vents while defrost and floor vents work fine...

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1 Answer

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There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,

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Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.

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Heat wont blow through heater or defroster vents


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