Gary sent me a diagram for the 76 GMC's vacuum lines. Is that the same as the 78? Used my inspection camera to examine my dash heater A/C box. All clean. Then checked the R-12 pressure with the system working. Really cold with lots of volume. Now the problem. There are two vacuum diaphrams that you can see to the left in a 77-78 GMC glove box. Mice got both tubes to the point that I can't tell the color of the tubs. I think there are 6 of these diaphams. As is. The heater/A/C doesn't go to any defrost. Even as a default. Next. How do you get the panel out that surrounds the glove box? Bob Dunahugh 78 Royale
Dash heater/A/C vacuum lines
- Thread starter Bob Dunahugh
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