Window fogging, humid rainy days..
12-02-2015, 08:32 PM
#1
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Window fogging, humid rainy days..
92, RS
It's a pain to drive in rainy weather (not that I want to) I almost never drive the car in bad weather. But those times I do...
Window fog. Sucks. Wipe off, comes back. Vents are blowing, Ac works, Heat works. So what else could it be? Settings on defrost...blowing on window.
It just doesn't seem powerful enough hot or cold.
Maybe the blower motor?. Vents not fully opening? Not sure.
It's a pain to drive in rainy weather (not that I want to) I almost never drive the car in bad weather. But those times I do...
Window fog. Sucks. Wipe off, comes back. Vents are blowing, Ac works, Heat works. So what else could it be? Settings on defrost...blowing on window.
It just doesn't seem powerful enough hot or cold.
Maybe the blower motor?. Vents not fully opening? Not sure.
12-02-2015, 09:14 PM
#2
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Car: 89 GTA/90 Iroc Vert
Engine: 5.7/5.0L
Transmission: 700R4 x 2
Axle/Gears: 3.27/2.73
Re: Window fogging, humid rainy days..
Quite possible damper not swinging all the way over to force all the air up to defrost vents. Damper is down in/near the heater coil box or right next to it. My 90 iroc damper is there .... Is air leaking out anywhere else /other vents while in defrost mode ?
when you slide the HVAC temp selector lever the cable should open/close waterflow to the heater coil. Also if you hear a hissing sound there is a vacuum valve in there that operates the actuators,. If Vac leak then maybe the issue. There was a repair vid on YT fixing the vac valve to better operate the actuators/dampers.
when you slide the HVAC temp selector lever the cable should open/close waterflow to the heater coil. Also if you hear a hissing sound there is a vacuum valve in there that operates the actuators,. If Vac leak then maybe the issue. There was a repair vid on YT fixing the vac valve to better operate the actuators/dampers.
12-03-2015, 11:29 AM
#3
Supreme Member
Re: Window fogging, humid rainy days..
Are you sure the heater core's not leaking? Just because you have heat doesn't mean it doesn't have a leak...
12-03-2015, 01:50 PM
#5
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Re: Window fogging, humid rainy days..
The heater core was replaced not long ago. No evidence of leaking. I'm leaning towards damper because it sure takes it's sweet *** time switching from settings or some type of vacuum.
I wish I could just throw a turbo blower motor in there and be done with it. heh
I wish I could just throw a turbo blower motor in there and be done with it. heh
12-03-2015, 08:15 PM
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Car: 88 IROC Z/28-under re-construction
Engine: 5.7 Tuned Port
Transmission: It's in there....
Axle/Gears: 9 bolt Borg-Warner
Re: Window fogging, humid rainy days..
Im voting heater core
12-05-2015, 12:52 PM
#7
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Re: Window fogging, humid rainy days..
There might be something else going on, the car was overheating a bit the other day.
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01-06-2016, 04:43 PM
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Car: 1987 Z28 coupe-hard top
Engine: 5.0 Ltr/305 ci 4 bbl carb
Transmission: 5 speed manual
Axle/Gears: RWD - Stock gears
Re: Window fogging, humid rainy days..
Was the replacement heater core a new AC-Delco OE, or a new aftermarket brand? OR was it repaired/used? Was it air tested prior to installation? Also heater core could have been damaged during installation. It does sound like it is seeping a little. You would not notice a leak under those circumstances. I would pressure test your cooling system first, to rule out the heater core. Good luck.
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