Test- can generic weather seal replace GM'* OEM heater core seal kit?
The purpose of this thread is to see if rubber foam weatherseal can be a substitute of GM'* heater core seal kit. GM'* heater core seal kit is very expensive, and very few small town GM dealers stock it. The seal kit goes around the heater core to protect from shock, vibration and possibly air drifts.
The generic weatherseal is sold at many hardware stores and big stores like Lowe'*. It runs about $8 for 10 feet of 1 1/4 wide and 7/16" thick. The weatherseal says all seasons on its package, but does not pinpoint maximum temperatures. The GM kit seals for around $36 retail, and from the pictures contains about 2 feet of product.
My test is to see if the weather strip can sustain a temperature of 225 degrees and then 350 degrees in a oven for five minutes.
The test of 350 degrees showed some degration of the foam, but not real bad. Very little smoke, of which I think was the adhesive. I tested the 350 degree first at my Wife had some food already in the oven. At 250 degrees at 15 minutes, no issues of smoking or major change in shape, it was a little softer.
Car engines run around 200 degrees. Based on this test, I think the rubber foam weatherseal is a safe substitution for the GM heater core seal kit.
2001 Bonneville SSEi, 219,000 miles.
Whats in my driveway:
1998 Chevy S10 4x4 ZR2, 1999 Olds Bravada, 2001 Pontiac Bonneville SSEi, 2007 Ford F-350 regular cab 2WD, 2008 BMW 335i coupe (Wife'* replacement for her Bonneville). The Bonneville is my favorite of all the cars in the driveway.