This truck has no AC , no dash speakers, no headliner, stock. Base model 78 Sierra with the 305
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Originally Posted by 1970pelle
The way I have always water tested as shown many years ago. If the vehicle has A/C, close everything up meaning all windows,vents. Turn A/C on high and on Recir. Engine running of course, then soap the body seals down with very soapy water. The A/C is building cabin pressure and will bubble at air gaps.
Also high mounted rear bed lamp gaskets will leak and run down both sides of the cab .
Ken
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