99 GMC Yukon no heat **SOLVED

Fless · Jan 12, 2025

The pic is a bit blurry but is that meltage (made-up word) around that pin?

the 18th letter · Jan 12, 2025

Fless said:
The pic is a bit blurry but is that meltage (made-up word) around that pin?

View attachment 447746

Yup. I cleaned it up and it’s working for now. I tried to switch the connection from the aftermarket but the knob pin goes all the way on the aftermarket, but not on the OEM.

GMCChevy · Jan 12, 2025

the 18th letter said:
I went for a ride today and I can hear the mechanism moving in the dash when I set temp from hot to cold and back. In addition, the air was see your breath cold with the temp set to cold. I felt the upper and lower radiator hoses and the uppers warmer than the lower. There’s a coolant leak as the reservoir was empty but radiator was still pretty much full.

Did you check the rad hoses or heater hoses? Rad hoses should have a difference like that the heater hoses shouldn't be as noticeable but both should be warm.

the 18th letter · Jan 12, 2025

GMCChevy said:
Did you check the rad hoses or heater hoses? Rad hoses should have a difference like that the heater hoses shouldn't be as noticeable but both should be warm.

I did not since cleaning the connection on the old switch resolved the issue and got the heat hot again.

99 GMC Yukon no heat **SOLVED

Fless

the 18th letter

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GMCChevy

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the 18th letter

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