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2005 impala overheating problem
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jwd2256
New User
Apr 2, 2012, 5:14 PM
Post #1 of 4
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2005 impala overheating problem
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Car info:
2005 Chevrolet Impala, 3.8 Series II, 90,000 miles.
I'm having a problem with my 2005 Impala LS overheating. I took it to a Firestone Auto Care shop and they did a diagnostic test on it. What they told me was that i need to repair or replace my radiator, change thermostat, replace radiator cap, and they recommended that i changed the radiator hoses in a few months. I took my radiator to a radiator repair shop where they checked for leaks and cleaned the radiator out, then i put the radiator back in and replaced the thermostat and radiator cap. It still overheats though. The temperature gauge fluctuates a little while i'm driving and if i go up a parking garage the temperature gauge need goes almost up to the red zone. I would really appreciate any help
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Discretesignals
Ultimate Carjunky
/ Moderator
Apr 2, 2012, 6:25 PM
Post #2 of 4
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Re: 2005 impala overheating problem
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If you have the ac turned off and it is running hot, are the cooling fans running on high speed? Do they ever cycle off?
Did you remove the radiator cap and make sure there is enough coolant in the tank after the engine has cooled down overnight? Did you pressure test the system after the radiator repair to make sure you don't have any other leaks?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Apr 2, 2012, 6:28 PM)
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jwd2256
New User
Apr 2, 2012, 6:35 PM
Post #3 of 4
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Re: 2005 impala overheating problem
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Yes, if i have the AC turned off it still runs hot and the fans switch on when its hot and then turn off after. I did check the coolant level again and it was full still. I didn't pressure test the system because it costs $90 each time where i live. Firestone never said they found any leaks so i dont know.
If you have the ac turned off and it is running hot, are the cooling fans running on high speed? Do they ever cycle off?
Did you remove the radiator cap and make sure there is enough coolant in the radiator after the engine has cooled down overnight? Did you pressure test the system after the radiator repair to make sure you don't have any other leaks?
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Discretesignals
Ultimate Carjunky
/ Moderator
Apr 2, 2012, 6:45 PM
Post #4 of 4
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Re: 2005 impala overheating problem
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Yes, if i have the AC turned off it still runs hot and the fans switch on when its hot and then turn off after.
These fans are designed to run at two speeds. High and low.
If the fans come on and then go off while the engine is idling with the ac off, your not overheating. If the fans are running full blast and never shut off and your gauge is getting into the red, your overheating.
There could be a problem with the gauge. If you had a scan tool, you could monitor the engine coolant temperature. Fans on those will kick on low speed around 217 degrees F. If the engine temperature gets up to 230 degrees F, the PCM will turn the fans on high.
You can also use a laser thermometer aimed at the base of the coolant sensor to see if the temps jive with your gauge.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Apr 2, 2012, 6:48 PM)
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