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Low coolant light keeps coming on?

Robin Whitworth Statzer

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Robin Whitworth Statzer New Member

Robin Whitworth Statzer

Posted
Posted

Our 2001 Tahoe has a low coolant light that keeps coming on. We just had the head gaskets done, the radiator is only 2 years old (it's the 3rd one) and we just put in a new coolant reservoir. Any ideas why this keeps happening? We top off the reservoir and the light will stay off for a few weeks, but eventually comes back on. TIA!

Coby7 Senior Enthusiast

Coby7

Posted
Posted

When you replaced the tank did you replace the sensor? The surface of the sensor might be contaminated from the head gasket incident make sure the pick-up surface is clean. May need to soak it in vinegar for 10 minutes.

Coby7 Senior Enthusiast

Coby7

Posted
Posted

Did he apply dielectric grease to the pins prior to installation?

Colossus Senior Enthusiast

Colossus

Posted
Posted

Ditto on the sensor. Have it tested. Even though it is newer, it can still have gone bad. Might need to hook up a GM Scan tool/Tech II to toggle the sensor or check the readings of that sensor via the Tech II, A good independent repair facility should have the tool. Probably save you some $$$ vs taking it to the stealership.

Swimmer8366 Enthusiast

Swimmer8366

Posted
Posted

Sounds like your losing coolant that it's not a sensor problem if your adding coolant to get it to go off check your water pump.

 

Sent from my Z981 using Tapatalk

Swimmer8366 Enthusiast

Swimmer8366

Posted
Posted

Mine did this for months than the pump blew out completely put new pump in not a problem with coolant since.

 

Sent from my Z981 using Tapatalk

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