'09 Traverse No Heat

[jayg]

Originally Posted By: Merkava_4
It's probably a blend door actuator. I had to replace mine one time, but it was a piece-a-cake because it was right behind the glove box.


It may the the blend door for no heat but where is the coolant going?

 

[MarkM66]

Originally Posted By: jayg
Originally Posted By: Merkava_4
It's probably a blend door actuator. I had to replace mine one time, but it was a piece-a-cake because it was right behind the glove box.


It may the the blend door for no heat but where is the coolant going?


Exactly. I need to check the water pump myself more closely. Dealer said it wasn't leaking.

If not, I need to have it checked for a head gasket leak or something.

 

[Drew99GT]

It's obviously losing coolant which is causing air pockets in the cooling system. We had the same issue on our 2007 Impala (loss of coolant and intermittent heat), albeit with a different engine, but same symptoms. Turned out the head gaskets, water pump, and water crossover gaskets were all leaking which is common on earlier GM 3.5L V-6s.

 

[Drew99GT]

Check this out:

http://www.traverseforum.com/index.php?topic=3315.0

 

[Merkava_4]

Originally Posted By: jayg
It may the the blend door for no heat but where is the coolant going?


A small coolant leak isn't gonna affect the heater's ability to provide heat.

A quick way to test that blend door is to put the A/C on Vent and move the Temperature to red. If it blows cold air in the red the same as it does in the blue, there's a good possibility the blend door for the heater isn't opening.

 

[Drew99GT]

Originally Posted By: Merkava_4
Originally Posted By: jayg
It may the the blend door for no heat but where is the coolant going?


[font:Verdana]A small coolant leak isn't gonna affect the heater's ability to provide heat.



On many cars it will because air pockets form in the heater core.

 

[MarkM66]

Originally Posted By: Drew99GT
Check this out:

http://www.traverseforum.com/index.php?topic=3315.0



Thanks. Mine doesn't have driver and pass controls. But looks like there are similar issues.

Why do I have more confidence in my '04 Pontiac Vibe with 220k miles on it then I do with this Traverse with only 50k?

 

[MarkM66]

Originally Posted By: Drew99GT
Originally Posted By: Merkava_4
Originally Posted By: jayg
It may the the blend door for no heat but where is the coolant going?


[font:Verdana]A small coolant leak isn't gonna affect the heater's ability to provide heat.



On many cars it will because air pockets form in the heater core.


I think you may be right. After filling the overflow, and allowing it to cool down, I guess the fluid was drawn back into the radiator allowing it to blow hot air again.