my heating on 1995 Dodge Spirit

the heat isnt working right, we changed the thurmastat and still all we get is just very little heat. what else could it be

by in Nashville, TN on January 09, 2010
2 answers
ANSWER by on January 09, 2010
Plugged heater core, or more likely the system that controls the heat, look at the heater control valve, make sure it is operating OK.
ANSWER by on March 11, 2011
I had the same poor heat problem with my 1995 Doodge Spirit 2.5 engine. I had a plug heating core. I took a 1/3 HP sump pump and put it in a bucket. I put in two cans of radiator cleaner and fill the bucket half way. Enough to cover pump. I disconnected both hoses from the heating core. The output hose from the pump to one input to the core. The other outlet from the core to the bucket. I ran the pump for 15 minutes and then reverse the hoses to run the cleaner in the other direction for 15 minutes. Then I let it sit for a hr with out the pimp running. Then I turn it on again for afew minutes. Then I connected up the heating core to the engine hoses. I started the car and I had heat. BUT when using a sump pump your risking blowing the seams in the heating core wide open as the sump pump pressure is much higher than the core is made to handle. But for me the risk was worth it as it fix the problem and far cheaper then a garage replacing the core.
Related Items:
my heat only comes out of the defrost..vaccuum hose off?