TRC Actuator and Air Conditioning Solenoid Question

[Kilian]

I have a 1983 3/4 ton with 350 V8 and heavy duty emissions that has the throttle return control (TRC) system with a vacuum actuator at the carb. I want to add air conditioning to the truck, which would mean adding the AC solenoid to the carb to increase engine speed above idle when AC is on. I think both of these items mount in the same place on a quadrajet, is this true? Any one have a truck with both TRC and AC and have both items on the carb? Thanks!

 

[Ricko1966]

If you have the TRC and it is functional it may very well do both functions,that's how Pontiac did it through 1967. You'd need to see what vacuum your e give idles at with AC on and how many inches of vacuum.it takes to keep the throttle positioned seated.

 

[75gmck25]

My ‘75 has no solenoid to increase the idle with A/C on (factory A/C and no evidence it ever had a solenoid) and it does not cause any issue. I do run the vacuum advance on full manifold vacuum, so I get a little idle speed increase from the vacuum advance.