- 175
- 103
- 43
- Location
- Wisconsin and Illinois
My truck had aftermarket AC systems installed which includes heat.
The heat blows well including on the defrost setting on the windscreen.
But when the truck is traveling at speed I can feel very cold air getting through the defrost vents up top.
How is this possible? Where is that cold air coming from?
Is there some outside air intake tied into the defrost vents???
The air intake on the AC unit is from passenger footwell as there is no outside air intake option.
The heat blows well including on the defrost setting on the windscreen.
But when the truck is traveling at speed I can feel very cold air getting through the defrost vents up top.
How is this possible? Where is that cold air coming from?
Is there some outside air intake tied into the defrost vents???
The air intake on the AC unit is from passenger footwell as there is no outside air intake option.