COOLING SYSTEM

10

Asked by Apr 23, 2016 at 12:23 AM about the 2007 Pontiac Torrent Base AWD

Question type: Maintenance & Repair

I recently had my head gasket replaced on
my 2007 Pontiac Torrent 3.4L AWD.  The
shop also replaced the radiator because
they said it was bad.  Ever since I noticed the
distinct smell of coolant inside the cabin.  
The vehicle ran OK for a couple months but
the smell never went away.  The heater
eventually went out and stopped blowing
heat.  The engine also began overheating.  
We replaced the heater core and tstat.  Now
the engine overheats and the heater still
blows cold.  The radiator hoses get hot  and
the fans turn on when temp is hot.  I'm
wondering if the shop may have installed the
head gasket wrong.  Any ideas?

6 Answers

72,315

This sounds like it was the heater core leaking. When you noticed the engine getting hot was the coolant level checked? So a possibility is you did not purge the air from the cooling system when refilling it. Air pockets would cause the engine to run hot, and no heat threw the heater.

1 of 1 people found this helpful.
10

The cooling system has an expansion tank with a pressure cap. The expansion tank functions somewhat differently than a conventional recovery tank. It is designed to separate any trapped air in the coolant. The radiator does not have a pressure cap. I ran the motor until it came up to temp. The radiator hose from the tstat housing was hot. I checked coolant level in expansion tank and noticed it was beginning to bubble over so I put the cap back on. I thought this would be OK since the tank has an overflow tube. Is there a specific method to burp the cooling 'system?

72,315

Sounds like you where doing just fine. But the thermostat needs to open for it too push any air out of the system. It should suck the coolant out of the expansion tank once the thermostat opens. If it just keeps pushing it out, then something is wrong. The expansion tank is high in the system, keep the cap off, coolant may spill out, but it should quit doing so and suck the coolant back into the radiator. Also have the heater set on hot, this will let it circulate threw the heater core.

1 of 1 people found this helpful.
10

What do you think about a flush and fill? I bought a kit but i am not sure where the tale is supposed to splice in.

1 of 1 people found this helpful.
10

Oops. "T" valve.

72,315

Flush would be good to try. There aut to be directions with the kit. The "T" usually goes into one of the heater hoses.

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