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defrost

sonoma driver

By sonoma driver
in Ask A GM Technician

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sonoma driver Enthusiast

sonoma driver

Posted
Posted

When i drive i have the defrost on and the coldest setting and it still fogs up. There are no leaks in my system for sure. But I have noticed in my owners manual that the air compressor will not work below 40*F. I am thinking that since I was driving in 20*F weather the air compressor would not dry the air properly and just send unfiltered air to the window.

 

 

 

sry if this is confusing but I have to drive and wipe my window every 5 min until it gets warmed up and then it takes about 10 min for me to wipe it

mmmikkke Senior Enthusiast

mmmikkke

Posted
Posted
If it's 20 degrees outside, why would you have it on the coldest setting?

 

 

 

Sonoma driver has at least one other thread on this defroster topic. I think he's still learning how to navigate through the threads and posts.

 

--

 

SD, I'm stumped. But I bet there are alot of other forum readers who have better ideas.

 

Grasping at straws, I'd check to see if the recirculate door is working. Maybe somehow you're not getting any outside air. Could be that the recirculate actuator is stuck in the recirculate position, preventing new (dry) air from entering the passenger compartment.

 

Also you should try to figure out why your temp never gets above 150. That's not good for the engine oil or the engine.

sonoma driver Enthusiast

sonoma driver

Posted
  • Author
Posted

to gm tech if I have it on heat then it makes it so i have to wipe more often

 

from what i noticed is that the temp gauge goes between 100(being the lowest temp) and 220(being the middle temp)

but the thermostat works I have tested it repalced the sensor as well. Plus I know it goes over that since my mpg is about 20

Trouttrooper Enthusiast

Trouttrooper

Posted
Posted

Do you know for sure if the compressor is turning on? You should be able to hear and see it kicking on and off with the hood up. I would suspect it isn't working. Have the AC level checked. If it's low it might not be letting the compressor turn on.

 

Do you by chance have a leaky door or spilled water in the cab? If there's a lot of moisture inside it can take a loooong time to drive it out of the air.

sonoma driver Enthusiast

sonoma driver

Posted
  • Author
Posted

I know it kicks on because i hear it.

 

As for the leaky door or lots of moisture it could be that I am big for a reg cab compact truck (6'2")and most of the time I have some one else with me about the same size so I think that may be a problem to how long it takes

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