Thread: heater not blowing hot air

My wife's car, 2005 GP v6 (non-s/c), has a heater blowing cold air. We've done two complete radiator flushes. I added the green mixture instead of DexCool the second time around. I've replaced the thermostat and have checked all of the hoses for leaks. The hoses going to and from the heater core are very hot. When flushing the radiator, both times, I flushed out the heater core as well. Once I do a radiator/heater core flush, the heater works perfectly. About a month later, the issue comes back.

Any thoughts?

Originally Posted by 01GTP

Are both hoses still hot when it is blowing cold air?

I will double check that today. Normally, both hoses are hot to the touch but I don't recall checking when it is blowing the colder air.

Originally Posted by 01GTP

It cold still be clogging up. If a heater core is really plugged a flush might only help for a short period of time.

How can that be resolved?

Originally Posted by 01GTP

Are both hoses still hot when it is blowing cold air?

Both hoses were warm to touch, definitely not as hot as the hose coming from the radiator.

Originally Posted by RobzSS

You need to bleed the air out of the system. There is a bleed valve on top of the thermostat housing. Open it until you see coolant coming out, then close it. Make sure you have heater blowing full blast.

How do you come to this conclusion?

On the day after my previous post, I drove my wife's car to work. When getting onto the interstate, I gunned it and got up to 70 fairly quickly and heard gargling noise in the interior of the cabin. I figure it came from the heater core so this is why I think I may have air in the system. Does that help the diagnose the issue?

Originally Posted by mfowler12

How do you come to this conclusion?

On the day after my previous post, I drove my wife's car to work. When getting onto the interstate, I gunned it and got up to 70 fairly quickly and heard gargling noise in the interior of the cabin. I figure it came from the heater core so this is why I think I may have air in the system. Does that help the diagnose the issue?

the gurgling means you DO have air in the system.

Bleed it before you get hot pockets in your engine and damage something.

there are 2 motors that are under your dash that control whether hot air is released into your car. they are stuck. very common problem. i just fixed this in my car. cost me $32. pm for more info

Dont necro and post the same thing four times...