Posted: Wed Jul 20, 2011 5:53 pm Post subject: 06 Impala Cooling system wierdness
06 Impala, just rolled over 251,000kms (155,000 miles)
It's been REALLY hot here lately up in the great white north 113 deg today and could hit almost 120 tomorrow.
Last week it was really hot too and I noticed the temp gauge creeping up over the halfway mark which made me raise an eyebrow.....after turning it off for a few minutes and getting back in the car the temp gauge had shot up over the 3/4 mark while sitting, after revving the engine it would go back to normal....but while coasting the needle would hover over the halfway mark.
I open the hood and find the cap to the coolant reservior open so I shut it and it ran fine after that. So I thought it fixed it because the system wasn't pressurized or something.
FF to today one of the hottest days of the year it starts creeping up again in slow traffic, then back to normal at highway speeds (airflow obviously)
So I thought it was the cap off again, nope, cap is perfectly situated with no leaks in the system or under the car. It runs like it did the day I got it it's just the temp issue.
This car has NEVER creeped over the halfway mark before so it's making me suspicious. Could it be low on coolant? I checked it and the level is completely normal. I had a flush 2 years ago as well.
Is it just this hot weather?
What are your thoughts?
Are your fans coming on?
Have coolant in the puke tank?
The '06 temp gauge is as nonlinear as they get. Mine gets to center fast even in winter and just sits there. When the fans cycle on & off the needle barely moves, < a needle width. It would get my attention if the needle went above half scale.
The '00-'05 is a much better gauge, it actually moves.
that's the first thing I checked, and yep, everything seems normal except for the gauge. When I rev the engine it moves back to the middle.
Same as you my temp gauge has never gone past the middle mark since I've owned it.
Might want to have an exhaust gas analyzer check for CO at the coolant fill cap.
Take the fill cap off and run engine and sniff for CO in coolant. Just to make sure the head gaskets are ok.
no CO = good head gasket
CO in coolant = problems
You did say the fans cycle ok, right?
Fans are electric, no clutch.
Thermostat opening all the way? Top rad hose should be hot, bottom rad hose not as hot as the top hose.
Is cooling system full? With engine cold remove the coolant fill cap, it should be full.
Dexcool and distilled @ 50/50 % is best but put what you have directly in the engine. You can start the engine and add coolant directly in the engine then put the cap on before the engine gets hot.
If the problem persists recheck for leaks then get the head gaskets checked as described in prior post.
so just to be safe, the coolant reservior at the back of the engine bay on the passenger side is supposed to 1/2 full........and the coolant cap bolted on the side of the engine is supposed to be full to the top......
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