I have a 2008 Chevy cobalt it has been overheating to 112-115 F how long will it take to have water pump replaced and thermostat?

80

Asked by Nov 10, 2015 at 11:50 PM about the 2008 Chevrolet Cobalt LT1

Question type: Maintenance & Repair

12 Answers

86,685

115 degrees F is not overheating. 115 centigrade is running quite hot. Which is it?

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80

Ok 115 c

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86,685

If it is running hot I would start with an engine flush and new coolant and replace the thermostat and hoses. A new radiator might be called for but if the water pump is not leaking then I would not change it.

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Best Answer Mark helpful
80

Replaced radiator has a brand new one

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Thermostat is easy. Is the fan running ? Does it overheat only in stop-and-go or still overheat at 60mph? Thats 240F

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80

Both at stop and go and at 60mph

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80

Yes fan running

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OK, so that blows my thoughts. Back to Full_of_Regrets ... really is best answer

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Only other thing I can think of is a very lean fuel/air mix will cause overheating. If the CEL is not on, man, I'm stumped

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86,685

Did you replace the radiator because it was over heating or did the overheating start after the new radiator? How many miles are on the car? Make sure you did not pick up a plastic bag that is blocking air flow to the radiator.

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72,515

A collapsing lower radiator hose will cause this as well. Check the routing of the serpentine belt. If the water pump is spinning opposite the direction it's supposed to you'll have overheating problems. On some GMs the water pump is supposed to spin the opposite direction of the engine. HTH. -Jim

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4,465

You probably trapped air in the system when you refilled it after replacing the radiator. Make sure the system has been properly bled and is actually full. If you can't get the air out of the system have a shop with the proper vacuum tool do it for you. If the thermostat is not new replace it just to be sure. That's cheap insurance, and they don't last forever. Sounds to me like everything else is working fine.

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