Hello all:

I have a heating problem with my '99 Cirrus,6 cylinder, 2.5L. When I come to a stop at a stop light, or any other stop that keeps me at idle for a minute or longer, the air coming out of my vents goes from nice and hot to cold. If I put her in neutral and rev...then it will get warm again. If I wait, then take off, ...warm again. I have plenty of coolant in the system.
Could the thermo be getting stuck closed?

Any help would be greatly appreciated.


Thanks in advance......................rob

 

low coolant then look for a leak.

 

Hey Tech!

Thanks so much. I had said that I thought I had plenty of coolant, but I was going by the overflow tank. I took the cap off over at the engine, and it took almost the whole jug of coolant. I wonder why my overflow tank shows a couple of inches worth all the time?

I will look for the leak, and thanks again. After filling the system back up, heat works all the time.

Much appreciated.

.............rob

 

I have a 2000 Cirrus and the same problem, I checked the overflow tank and the area where the hose from engine enters the tank was never drilled out. I drilled and tapped and installed a brass fitting but I still have very little water going to my heater core. What next.

 

Check the hoses going to the heater core to make sure they are not obstructed. Check the heater core itself to make sure it's not blocked. After 15 years, things can start to plug up.

If you decide to try to flush all or part of the system, do it carefully. The system was designed for about 15-16 psi of pressure. Household water pressure can be several times that and can blow seals and cause havoc.