Qball, got the same issue with my 2002 GP, took it by a local mechanic and he told me it's the dual climate control plate with all the controls. said to get one from a salvage yard, they go for 75 dollars used and 300 new. Was going to ask the same question but you beat me to it looking for confiramtion on this. Ours also works most of the time untill you get on the highway and then it's always hot on the drivers side, mechanic said that's because it can't handle the electrical load.
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74 Formula
Below motor destroyed fall of 2023
469, 6X-4's, 72 Intake, Ramair Manifolds.
3 inch exhaust with x-pipe
Custom Roller Cam, 1.52 Roller Rockers
Quadrajet done by Cliff
3:42 gears
12.061 @ 110.74
12.092 @ 112.43
12.128 @ 111.71
461 stroker
Edelbrock 87 cc dport heads
Performer RPM
Same Ram Air manifolds, and quadrajet
75 Formula 400 / 4-SPD matching numbers
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