2005 Tahoe will not get to operating temp in cold weather.

25

Asked by Dec 29, 2015 at 07:41 PM about the 2005 Chevrolet Tahoe LT 4WD

Question type: Maintenance & Repair

Last winter I hit a deer and radiator tranny cooler and basically all new front
end was replaced. Ever since the operating temp will not get above 180
degrees in the winter.

6 Answers

37,975

Need to make sure there is a 195 deg. thermostat in her.

2 out of 2 people think this is helpful.
25

Thanks for the quick reply. 4 different shops have worked on this issue but have not fixed the problem. Thermostat is brand new as well as the housing. Summertime the Tahoe will run at 210 only winter time the temp drops.

1 out of 1 people think this is helpful.
19,235

ALSO...IS THE FAN/S TURNING OFF AT SET TEMP...

2 out of 2 people think this is helpful.
Best Answer
56,855

Definitely sounds like a bad/wrong thermostat. If you have an older mechanic he may be installing a 180°F thermostat by mistake. That was standard across the board at GM. But computer controlled engines, like your Tahoe, require a 195°F thermostat. HTH. -Jim

1 out of 1 people think this is helpful.
25

Thanks for the answers. I've had 4 different shops try all the things you suggested. This problem is only in the winter. Summer the operating temp stays 210 when warmed up. Even at 30 above the temp is 180. Only when idling did it reach 210 but when I started driving the temp dropped.

1 out of 1 people think this is helpful.
56,855

One other possibility comes to mind. If there's a bypass valve incorporated in the thermostat housing it may be stuck open. Check for proper installation of the heater hoses as well. Somewhere coolant is sneaking past the thermostat. HTH. -Jim

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