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re: Car overheating while idle.

Posted on 4/15/16 at 1:48 am to
Posted by Jalbow3
Trussville
Member since Oct 2008
4077 posts
Posted on 4/15/16 at 1:48 am to
Your thermostat could be stuck open. You should probably start there.
Posted by iamAG
Member since Aug 2015
3517 posts
Posted on 4/15/16 at 2:29 am to
Checking the thermostat is a stupid place to start. It's more than likely not that at all. I'd bet 99 percent that it's his fan. It's an easy fix and is a very common break. Just an fyi. When you troubleshoot you start with easy and work from there. That means the fan should be checked first. Troubleshooting is a lost art now days.
Posted by dbeck
Member since Nov 2014
29453 posts
Posted on 4/15/16 at 2:38 am to
quote:

Your thermostat could be stuck open. You should probably start there.

Why would it overheat if the thermostat was stuck open and coolant was running through the radiator constantly?

What could be causing overheating during idle only (in order of likelihood):

1) Fan clutch is sticking
2) Fan is bad
3) Fan isn't getting power or signal to turn on
Posted by Kingpenm3
Xanadu
Member since Aug 2011
8978 posts
Posted on 4/15/16 at 9:21 am to
quote:

Your thermostat could be stuck open. You should probably start there.



This. If the water isn't flowing, nothing is cooling. But it is probably stuck closed.

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