Vintage Air System not too cool????!!!!

Every FSM I have read (from memory) has a performance testing chart in the heating and a/c section. They usually call for windows closed, Max a/c (resirc air), High (INSIDE) fan, and engine idle turned up to 1000-1100 rpm. If the system is equipped with an electric fan it should be on all the time when the ac is on. The chart will match ambient temp With a normal range of high and low side pressures and duct outlet temp.

It sounds like you have a 45 degree drop from ambient to duct temp. with the condenser fan cycling, and the engine idling. That my friend is kicking but, big time.

What are your duct temps going down the road???


Like stated above, set up your fan to run continuously with ac on.

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