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Old 03-26-2020, 04:48 PM   #1
PrestonIII
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1994 SL2
1994 SL2
Default 94 SL2 HCE Foggy glass inside

I've had 3 1st gen SL2's and all 3 have had issues wherein the inside glass fogs up during wet weather, and the defroster has almost no effect. The defroster will clear about 80% of the windshield, and the rear defroster cleans horizontal lines across the rear glass, with fog between them.

Has anyone else had this problem, and has anyone found a way to fix it?

There's a factory recall that points to cleaning out the A/C drain and clearing the plenum drains at the base of the windshield below the windshield wipers. It even tells you how to set the HVAC controls to maximize drying the glass.

Since there was a recall, I'm betting this is/was a common problem. And I'm betting someone else has more info about it.

Any ideas?

Preston

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Old 03-27-2020, 10:45 AM   #2
hholbein
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1997 SW2
Default Re: 94 SL2 HCE Foggy glass inside

In addition to clearing the AC evaporator drain, do you have any undetected leaks? Check your spare tire and passenger floor area. Hopefully, you don't have a sunroof, since that is another source of water leakage.

If there are leaks, the water evaporates when it gets a bit warmer and it's hard for the heater to effectively clear all the moisture condensing on the windows.

I think in general the heat is pretty good in these cars, and so is the blower motor -- unless your fan motor is getting really old and worn out or the squirrel cage is filthy.

Let us know what you find.

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Old 03-27-2020, 12:01 PM   #3
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Default Re: 94 SL2 HCE Foggy glass inside

Try the A/C button. Doubtful it'll work as '90's era GM A/C wasn't worth installing any more than 90's era GM ABS but A/C is a great way to remove moisture when it actually works.

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Old 03-29-2020, 07:47 PM   #4
PrestonIII
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Default Re: 94 SL2 HCE Foggy glass inside

I do have a sunroof, and it does leak, though not a lot. There is plenty of moisture in the car to the point that it sometimes smells musty in there from the damp carpets.

My A/C works well and it's R134. It will clear the windshield, at the expense of freezing me out of the car due to the low ambient temps, the humidity in the air, and the cold from the A/C. Beside's which, GM's recomendation in their recall bulletin specifies better defogging without the A/C. I think the reason for that is that the evaporator just gathers the humidiy in itself, and puts it back into the air as it moves around.

About the only cure that comes close is to roll all 4 windows down about 3-6 inches and drive. . . . fast. Some folks call that 4-60 air conditioning. The buffeting in my ear drums and the noise is prohibitive though. Oh, and opening the sunroof works as well. But you can't do that in the rain, and you freeze too.

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Old 03-29-2020, 10:13 PM   #5
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2003 L-Series 3.0L Sedan
Default Re: 94 SL2 HCE Foggy glass inside

Are you aware of using ac with as much heat as you want in cold weather to help defrost while still providing heat? Ac use serves two purposes - dehumidify and create cold air. Adjusting the temperature control just adds as little or as much heat as needed while still dehumidifying airflow thru the hvac box.

...
VCX NANO

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Old 03-29-2020, 10:17 PM   #6
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Default Re: 94 SL2 HCE Foggy glass inside

^^ very correct

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Old 03-30-2020, 01:49 AM   #7
mattwithcats
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2002 SL2
Default Re: 94 SL2 HCE Foggy glass inside

I have found dirty glass tends to fog up more than clean...

Bucket of hot water, generous squirt of Dawn, and a brown 3M scrubbing pad.

Not the green one, the brown one. Green scratches chrome, and paint...

https://www.3m.com/3M/en_US/company-...8709316&rt=rud

Use small circles on glass, rinsing often. Wipe with lint free cloth...

...
2002 Silver SL2, manual, 5th gear swap (.605), 80,000 miles, black badges,
205/60R15 "H" rated tires, 5mm spacers rear...
Pennzoil Maximum Power 0W-30, Champion COS3600...
NGK BKR6E-11 spark plugs

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