Air is bunk works great. In cab sux. The temp doesnt change. Always blows semi cool. When I turn the defrost on it will actually warm the cab but if I turn it to feet, chest, anywhere other than defrost, very little air come out. I have to run my bunk ac on high to keep the front tolerable. I've read, possible blend door actuator. Where is it located? I see 3 or four under the dash. Does anyone have a diagram for the 579 ac? Getting pretty aggravated with it.
2015 579 air conditioning
Discussion in 'Peterbilt Forum' started by calvinbabb, Apr 30, 2020.
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I'm wondering if the cabin filter is clogged up.
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I change it every 6 months. So no. Also have cleaned the coils.
Flat Earth Trucker Thanks this. -
Im having a similar issue on my 2016 579. All vents works except the front vents. I checked the fuses and they all seem fine.
Im guessing its a blend door actuator, but there are 5 of them, so I have no idea how to figure out which one it is.
Theyre around $100 each -
I know there was a service bulletin from peterbilt on our years due to blend door failure but was for the doors themselves.
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mhlvc Thanks this.
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