No heat!

[goldcrown61]

I have a 2008 Grand Prix. I have noticed the last year the heat coming out of the vent is luke warm. when I accelerate it gets warmer but at idle it cools off again. I have 73,000 miles on it. Is it time for a flush?

[Fivefingerdeathpunch]

I would flush the coolant, and pop in a new thermostat (195*).

[goldcrown61]

I will give that a try and let you know the results. Thanks for the reply!

[goldcrown61]

Well, I had the system flushed and thermostat replaced. Now that winter is here I am still at square one. Someone told me it could be the temperature control valve?

[bps02gtp]

Do a complete system flush and then do a reverse flush through the heater core. Blast a hose through both the things of the heater core. Make sure u have clean and the same amount of pressue coming through both ends. Then u should be good.

What happens is when u take off, the water pump pumps more pressure through and that's y its warmer until u slow down. Then its not pumped as hard and fast.

[goldcrown61]

Thanks for the advise. I will give that a try and let you know what happens.