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#1 |
Registered User
Join Date: May 2021
Location: Seattle
Posts: 13
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Condensation in cab
My cab is getting really wet inside on the roof and windshield. The door seals are new and I checked they’re sealing properly and there’s no leaks, carpet is dry everywhere, but somehow moisture is getting in, there is so much condensation on the roof, it gets really wet, I have to towel it off.
Anyone have any experience with this? I was told by a mechanic to put dynamat on the roof and it will stop, but that sounds odd to me. |
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#2 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,936
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Re: Condensation in cab
I'm assuming by your handle that you have a '71 C20. How is the driprail seal? Is it all chipped out and rusted?
I live in western WA and know how wet it can be, and we've had a LOT of rain lately. Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#3 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,901
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Re: Condensation in cab
Do you have leaves blocking the cowl drain holes under the vents?
Also check the bottom of the windshield, the cowl area, and the firewall for rust.
__________________
I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#4 |
Senior Member
![]() Join Date: Dec 2014
Location: Edmonton Alberta
Posts: 1,330
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Re: Condensation in cab
Generally speaking indicates a heater core issue, even in modern vehicles.
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DAVE Edmonton, Alberta 1959 Apache 1967 K20 1968 C20 1970 C10 1972 GMC 2500 1981 C10 |
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#5 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,936
|
Re: Condensation in cab
Oh, and do you have clearance lights on the roof?
Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
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#6 |
Senior Member
![]() Join Date: Oct 2020
Location: Kathleen, GA
Posts: 636
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Re: Condensation in cab
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#7 |
Registered User
Join Date: May 2021
Location: Seattle
Posts: 13
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Re: Condensation in cab
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#8 |
Registered User
Join Date: May 2021
Location: Seattle
Posts: 13
|
Re: Condensation in cab
I don’t think it’s the heater core, no coolant smell or leaks, the cab seems tight I don’t understand where it comes from. Even with a waterproof cover and tarp over it condensation still builds up.
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#9 |
Registered User
Join Date: May 2021
Location: Seattle
Posts: 13
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Re: Condensation in cab
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#10 |
Senior Member
![]() Join Date: Dec 2009
Location: TN.
Posts: 8,069
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Re: Condensation in cab
Are the Fresh air vents opened or closed?
Do they have debris or leaves in them?
__________________
________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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