Quick

"jkm7680" (jkm7680) 01/10/2016 at 10:38 • Filed to: None

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19

Coolant temp gauges goes from halfway mark, down to 1/3 while driving on highway. What does this mean?

Thanks pls halp

MM54 > jkm7680 01/10/2016 at 10:40

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Thermostat is stuck open

Uug > jkm7680 01/10/2016 at 10:43

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Thermostat

whoarder is tellurium > jkm7680 01/10/2016 at 10:43

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Also agree: likely thermostat.

Do you have good heat output at idle?

Twingo Tamer - About to descend into project car hell. > jkm7680 01/10/2016 at 10:50

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Thermostat or maybe cooling fans coming on when they shouldnt

DoYouEvenShift > jkm7680 01/10/2016 at 10:52

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Tstat is probably sticking open. Should set a code aftet a while. P0128 or something like that. Or if its a VW code, it will say W4729fndkdk or something of that nature lol

MultiplaOrgasms > jkm7680 01/10/2016 at 10:53

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Your Auto Union is cold as iceeeee.

Jayhawk Jake > jkm7680 01/10/2016 at 10:58

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Audi operating as expected: something is broken

GeorgeyBoy > jkm7680 01/10/2016 at 11:01

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Plastic parts have cracked.

If only EssExTee could be so grossly incandescent > MultiplaOrgasms 01/10/2016 at 11:02

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It’s willing to sacrifice our loooove.

SirDrivesAlot (now with hybrid powerrrr) > jkm7680 01/10/2016 at 12:03

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Thermostat is what I was going to say, but MM54 beat me to it.

jkm7680 > DoYouEvenShift 01/10/2016 at 12:17

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No codes stored, except 02 sensors.

EL_ULY > jkm7680 01/10/2016 at 12:38

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Temp sensor is suuuper easy to replace. Theu are like $15 also

Spaceball-Two > jkm7680 01/10/2016 at 13:24

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T-stat

KusabiSensei - Captain of the Toronto Maple Leafs > jkm7680 01/10/2016 at 14:00

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Do you have chocolate milkshake in the oil sump and coolant overflow tank? Is the coolant tank puking its guts out? Are you blowing white smoke?

If so, you have a bad head gasket!

Otherwise... Yeah... It’s probably a stuck thermostat. I changed both of the tstats on the Duramax yesterday.

KusabiSensei - Captain of the Toronto Maple Leafs > DoYouEvenShift 01/10/2016 at 14:02

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You don’t always get a code if the thermostat sticks on cold start. Instead the ECU will stay in open loop mode. If it is egregious enough you may get one.

That was the mode of failure on my Silverado.

DoYouEvenShift > KusabiSensei - Captain of the Toronto Maple Leafs 01/10/2016 at 16:27

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Oh yeah, some PCMs are pickier than others.

brianbrannon > jkm7680 01/10/2016 at 16:33

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Low coolant most likely

Shour, Aloof and Obnoxious > jkm7680 01/10/2016 at 17:55

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Radiator fan not spinning. So water doesn't get cooled as much until you start moving at highway speeds.

jkm7680 > brianbrannon 01/10/2016 at 18:04

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Not that. Coolant level is fine.