Need heat!

[DallasTahoe]

98 Yukon, heat blows hot when driving but not when I’m at a light or idling, just kind of warm, it’s 26 degrees in Dallas right now, so kinda like to be warm lol. It’s full of antifreeze and the fan does blow like it should. I don’t want to take any antifreeze out, anything I can do?


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[OR VietVet]

Basics first. Is the coolant full? How old is the thermostat? How old is the water pump? I would be worried that there is impeller problems at the back of water pump. Check for good flow thru the heater core by checking the heat of both core hoses and see if the temps are close to the same. Possibly a heater control valve having a vacuum problem at idle.

https://www.rockauto.com/en/moreinfo.php?pk=84579&cc=1305076&jsn=2238

https://www.rockauto.com/en/moreinfo.php?pk=679484&cc=1305076&jsn=2249

https://www.rockauto.com/en/moreinfo.php?pk=1021536&cc=1305076&jsn=2272

 

[DallasTahoe]

Everything is pretty much new, I think I made my cooling system too efficient, runs really cool in the summer with the ac on in 100+ heat


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[OR VietVet]

What degree thermostat is in it and does it have the little weep hole in the thermostat plate for bypass?

 

[OR VietVet]

Did you do the radiator too? New radiator?

 

[Fless]

What temp does a scan tool say the coolant temp sensor is reporting when it's warmed up?

 

[DallasTahoe]

What degree thermostat is in it and does it have the little weep hole in the thermostat plate for bypass?

190


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[DallasTahoe]

Did you do the radiator too? New radiator?

Yep


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[DallasTahoe]

What degree thermostat is in it and does it have the little weep hole in the thermostat plate for bypass?

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[OR VietVet]

Your, too efficient, analogy may be spot on. Try using a piece of cardboard and put in front of the radiator on the grill and tie it off some how. Then drive it and watch the engine temp to make sure it does not get too high. See if is warmer at stops. Is the fan clutch new as well?