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1989 GMC R3500 7.4L ac
Posted to GM HVAC on 6/15/2000

I retrofitted this system in 87. did not cool very good even with R12 & about the same with 134a. I have installed the new type [VVOT] orifice tube & adj cycle switch to cycle at [...] clutch air gap because of intermitten operation,clutch works ok now. coolin...

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car Vehicle Data

1989 GMC R3500

VIN 1GTHR33N8K
Engine7.4 L / 8 cyl
AffectedA/C
ConditionsLittle Cooling
Misc.Old Body Style
Message Closed

car Vehicle Data

1989 GMC R3500

VIN 1GTHR33N8K
Engine7.4 L / 8 cyl
AffectedA/C
ConditionsLittle Cooling
Misc.Old Body Style