Installing Headliner Insulation in a Truck

It’s getting hot here in July and my 1990 Chevy truck’s AC hasn’t been converted to R134a refrigerant yet. And it’s out of refrigerant. So I’m noticing all the ways in which the interior gets heated up. The other day I was sitting in the sun waiting for someone and I realized heat was radiating off the inside of the truck’s roof. The front part was cool to the touch because it is double-layered metal, but the back part was another story. It was nearly too hot to touch and it felt like it was pumping out heat into the interior.

That’s what it looked like before I added the insulation. I used a roll of insulation I found at Home Depot. It was $10 for a 2 ft x 10 ft roll. I cut it down to 18 inches x 45 inches to fit the area I wanted to insulate. I then used 3M spray-on headliner adhesive to make it stick to the metal.

I wish I would have measured the temperature before and after. It’s a drastic improvement. I left the truck sitting in a parking lot in similar conditions for about the same amount of time as the day I noticed the heat. The interior insulation was barely warm to the touch when I came back out.

The stock headliner would have accomplished this insulation, but it’s made of pressed cardboard-like material and had fallen apart over the years. I plan on adding an aftermarket headliner from LMC at some point, but this insulation will just add to the affectiveness of the headliner when I get it.

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