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Re: 87 GMC Sierra R3500 7.4L TBI vacuum diagram
Quote:
Originally Posted by DieselSJ
It supplies vacuum to the modulator on the trans and the A/C controls. One port would be capped if you have a manual trans and the other would be capped if you have no AC/Heater controls.
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I’ve both, the port for the auto tranx is connected,
the AC port is capped, so where does it go or connect?
Thanks
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1972 GMC Sierra C2500, V8-350
1986 GMC Sierra C2500, V8-454
1986 GMC Sierra C2500, V8-LS1
1986 GMC Sierra K2500, V8-350
1987 GMC Sierra R3500, V8-454
1997 GMC Sierra K2500, V8-454
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