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12-15-2023, 12:02 AM
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#1 |
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Registered User
Join Date: May 2021
Location: Seattle
Posts: 14
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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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12-15-2023, 01:08 AM
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#2 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,978
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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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12-15-2023, 01:23 AM
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#3 |
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Registered User
Join Date: Jan 2001
Location: Orem, Utah
Posts: 8,264
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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 1972 K/5 Blazer CST 4WD 1963 Corvair Monza Spyder Turbo convertible 1995 Camaro Z/28 |
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12-15-2023, 01:39 AM
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#4 |
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Registered User
 
Join Date: Dec 2014
Location: Edmonton Alberta
Posts: 1,758
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Re: Condensation in cab
Generally speaking indicates a heater core issue, even in modern vehicles.
__________________
DAVE Edmonton, Alberta 1959 Apache 1967 K20 1968 C20 1970 C10 1972 GMC 2500 1981 C10 |
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12-15-2023, 01:53 AM
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#5 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,978
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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:
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12-15-2023, 01:33 PM
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#6 | |
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Registered User
Join Date: Oct 2020
Location: Kathleen, GA
Posts: 753
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Re: Condensation in cab
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12-15-2023, 10:07 PM
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#7 | |
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Registered User
Join Date: May 2021
Location: Seattle
Posts: 14
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Re: Condensation in cab
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12-15-2023, 10:09 PM
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#8 | |
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Registered User
Join Date: May 2021
Location: Seattle
Posts: 14
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Re: Condensation in cab
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12-15-2023, 10:10 PM
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#9 | |
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Registered User
Join Date: May 2021
Location: Seattle
Posts: 14
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Re: Condensation in cab
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12-15-2023, 10:30 PM
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#10 |
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Senior Member
Join Date: Dec 2009
Location: TN.
Posts: 9,871
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Re: Condensation in cab
Are the Fresh air vents opened or closed?
Do they have debris or leaves in them?
__________________
________________________________________________________________________________________ ____________________________________________ The early bird gets the worm, But the second mouse gets the cheese 85 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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