I'm in a fog LOL

[Porsche304]

Hey, When I drive my 84 944 the fuel/temp and the tach gauges fog up on the inside, but not the speedo? I have to drive the car a least 10 miles are so, before they fog.
My windshield is not fogging,so I think it is not a heater core leak,as I am not losing any coolant? Anybody else had this problem? Thanks for your time, Casey

[jjeffries]

Likely either water leak (e.g., sunroof drains or water ingress through rust under battery) or heater core, which could be leaking enough to create moisture without noticeably lowering the coolant level. A coolant system pressure test might be prudent but could accelerate the failure of something that’s now marginal. But better to discover that in your garage than on the open highway.

Best of luck,
John

[Porsche304]

Originally Posted by jjeffries

Likely either water leak (e.g., sunroof drains or water ingress through rust under battery) or heater core, which could be leaking enough to create moisture without noticeably lowering the coolant level. A coolant system pressure test might be prudent but could accelerate the failure of something that’s now marginal. But better to discover that in your garage than on the open highway.

Best of luck,
John

Thanks I will check it out.

[ERAU944]

You can pull the little plastic plug out of the tip of the plastic gauge cover and let them breathe... but if there's a moist environment in the car they're still going to fog up. Find a way to get really dry air in there and you may be able to make them stop.

[Porsche304]

Originally Posted by ERAU944

You can pull the little plastic plug out of the tip of the plastic gauge cover and let them breathe... but if there's a moist environment in the car they're still going to fog up. Find a way to get really dry air in there and you may be able to make them stop.

Thanks for the info. I drove the car today and no fog, so we will wait and see what will happen. Thanks again

[ERAU944]

No problem! If they fog again from moisture in the car, pop the plug out of the front and take a computer duster spray and spray gently towards the bottom of the gauge face (put the straw all the way in if you can.) The idea is to force the dry air into the guts of the gauge and push the moisture back out the hole. It may take a few tries but I think that may be your best bet without disassembling the gauges. The plastic bezels can be removed and reinstalled, but it is a PAIN and very time consuming, especially if you don't want to ruin the bezel.