Question about Cars & Trucks
Need to find manual or info on why when on heat the air is cool on the other side getting to flows when I need only HEATER
Posted by Anonymous on
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Posted on Jan 02, 2017
I am having/had the same problem. My rear heater has not worked the last 2 winters, still trying to figure that one out. But I think I solved the front heat problem myself. The heater was blowing cold air while idling and hot air when the car was moving.
I jacked up the front of the vehicle, took the cap off of the reserve tank for the radiator, turned the car on and ran the heat (AC off) for 15 minutes. This is supposed to release any air bubbles in the coolant system and I did see air bubbles emerge as I was watching (this might be normal occurance, I'm far from a mechanical expert). Anyway, this did not immediately solve the problem, still blowing cold air as it sat there idling after 15 minutes. Dejected, I put the cap back on, lowered the vehicle and resigned myself to taking it to a dealer.
But a funny thing happened the next day, the coolant level was a lower (no leaks on the floor) so I filled up, and sure enough, when I started the car and let it warm up a little, hot air started coming out of the heater!!!
As far as my wife knows, I fixed the problem for the price of a bottle of coolant, so I am a hero...but at first I thought it didn't work. Here we are a month later and still blowing warm air and haven't had to replace any more coolant...the internet is a wonderful thing!
Hope this works for you, and I hope I can figure out my rear heater problem as well.
Posted on Jan 30, 2009
Hello and welcome. this is caused by a bad temp door actuator for the drivers side temp door. it is stuck on cold. the temp door actuator will need to be replaced to repair this concern. here is a picture. it is mounted to the drivers side of heater a/c case, behinde the dash.
Posted on Sep 21, 2010
SOURCE: Bought my jag late Spring,
The blend door(s) is (or are) not functioning correctly.
Here are instructions on how to remove and replace the various blend door actuators:
Re-Circulation Blend Door Actuator
Instrument Panel Blend Door Actuator
Defrost Vent/Register Blend Door Actuator
Footwell Vent/Duct Blend Door Actuator
Cold Air Bypass Blend Door Actuator
Posted on Oct 23, 2010
Uplanders with the 3.9 engine are prone to no heat at idle speeds. Probably weeping head gasket. Air bubble trapped. Dealers will remove rad cap and let it sit at about 25 deg. angle for a couple hours. Good for awhile.
Posted on Nov 23, 2010
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