No heat in 2015 Peterbilt 579. I turn the deep frost on to max and it will cook you out of the truck. When I turn it to just regular defrost I get nothing but cold air. The actuators appear to be working to opening the doors to change from foot to defrost to chess vents. But nothing will come out other than cold air. Just don’t understand why I have heat on max defrost only.
If this post sounds funny or looks funny in the spelling, I’m using voice to text. Sorry
No heat in 2015 Peterbilt 579
Discussion in 'Peterbilt Forum' started by calvinbabb, Jan 8, 2022.
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I have all positions get air when their prospective selection is made on the climate control but is cold. So those doors are working. I get cold air on defrost normal. But if I hit defrost max it’s hot. When I turn off the max, I can feel the warm air come from any vent just briefly until that air cools again. Almost like the blend door is closing on anything other than max defrost.
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Hummmm check the heater core lines. Are they warm to the touch? Also check your coolant level.
Also could still be one of the actuators sticking but the one doe the defrost opening or being forced open by the warm airflow.Attached Files:
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