01 Jeep Grand Cherokee heater only blows freezing cold air?
a/c works fine. but the defrost, heater and seat heaters don’t work at all
7 Responses
seagull
03 Feb 2010
kloackster
03 Feb 2010
get your heating system back-flushed at a mechanics shop. it cost me about $100 when i had it done
da cool m1
03 Feb 2010
Your thermostat is bad. Take it to an auto mechanic. I am having the same problem.
tyesmomma
03 Feb 2010
I would check the fuses, the manual usually tells you what fuse goes for what part of the car.
jeepaholic
03 Feb 2010
the problems in your heater core its either (if you bought it used) taken out for some lame reason or its clogged up and if its clogged you need to take it to a mechanic so they flush the heater core to get the junk out of it or in general test it to see if you need a new one. your seat heaters are completely different from defrost and heater because that is an electric heater in a sense. also your a/c will work fine because your a/c doesnt have anything to do with the heater core. but definitly go have your heater core checked out and if they say its your thermostat they are wrong because all the thermostat does is regulate the flow of coolant into the engine which thus has absolutely no effect on your heating problem.
pcnut4u
03 Feb 2010
That’s a good one. Inside the hvac housing there are several doors that direct the airflow. One moves the air from defrost, floor or dash vents (mode door). Another one controls the mix from the heater core and the evap (blend door). The last one controls the where the air comes from, outside or inside (recirc door). It’s possible the blend door is not moving.
The heated seats not working would be a different issue because it is not connected to that system. Your best bet is to take it to a dealer for that one.
Glenn Kawesch
03 Feb 2010
Hi, Glenn Kawesch here,
I had that same problem and it cost me $1000 to fix it.
Good luck,
Glenn Kawesch
check your fuses