Car overheats when idling but cools down when running.

[MIguel07]

So pretty much how the title states. The car overheats when it just sits there idling, but when I start driving it the temps drop down to normal. The temps do fluctuate when its running though. I see temps from 175 to 200 when running. what could it be?

 

[Slippery Nut]

So pretty much how the title states. The car overheats when it just sits there idling, but when I start driving it the temps drop down to normal. The temps do fluctuate when its running though. I see temps from 175 to 200 when running. what could it be?

I've got a 2000 GT that had a similar problem. It ended being a bad head gasket.

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[speedoflife]

Does the fan turn on?

 

[97snakebite]

check your fan connector and report back

 

[Roots-type]

could be the radiator becoming clogged

 

[Four Door SVT]

could be the radiator becoming clogged

Or condenser, are you running a/c?

 

[cj428mach]

Id look at your fan. The symptoms you're describing are an Air flow problem, thats why when you're out driving the problem goes away.

 

[Roots-type]

Or condenser, are you running a/c?

I was talking about being internally clogged, but debris is also a possibility

Id look at your fan. The symptoms you're describing are an Air flow problem, thats why when you're out driving the problem goes away.

The fan is the first and easiest thing to check, but an internally clogged radiator will show these symptoms as well. Exact same thing happened to my mom's '01 several years back.

 

[BlksvtCobra01]

Id look at your fan. The symptoms you're describing are an Air flow problem, thats why when you're out driving the problem goes away.

This ^. See if your fan turns on.


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[MIguel07]

Thanks for the response guy! I will first check if the fan turns on tomorrow.
I will keep you guys updated

 

[Goose17]

Overheat while not moving and cools down when moving is definitely a fan thing. This happened to my GT500. The fan motor was dead.

 

[96gt02]

same thing happened to my mach, it was the fan

 

[Zemedici]

hey. I think its the fan.

@Deceptive what do you think?

 

[Roots-type]

such a quick thing to check I'm surprised OP hasn't returned.

 

[gimmie11s]

After all, if it weren't for the Termi, electric radiator fans would not exist.

 

[97snakebite]

Where that update???? Taking beats!! Guarantee the connector is ugly On the power side

 

[MIguel07]

Yup the fan isn't turning on. The fuse isn't blown though

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[MIguel07]

Also the connectors look good

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[MIguel07]

Hey guys so I finally got time to work on my car. Fuses were good connectors were good. Took the fan out and got it tested and was also good. Any other ideas?

 

[MIguel07]

Also forgot to mention this didn't start happening till I changed my intercooler.