Truck A/C question

[cajunduckslayer33]

Sounds like either a pressure switch or dirty condenser coil. I would try to spray and clean condenser coil. Seems like the head pressure is climbing when car is stopped because of insufficient airflow. Then when you drive again you are forcing air across coil.

[Bad Boy]

I had the same issue with an 87 Toyota Truck. One way to test the dirty condenser theory is to leave it idleing at home and put a box fan blowing through the grill. If it cools off it could be one of two things. Either the condenser is dirty or the fan clutch Is week. Too test the fan clutch try stopping the fan with your hand when the motor is at normal running temp. The blades are plastic and will not hurt you. If you can stop the fan by hand your fan clutch is bad and not pulling enough air through the condenser when stopped this will cause the head pressure to rise and your AC will stop cooling.

[duckman1911]

Originally Posted by Bad Boy

I had the same issue with an 87 Toyota Truck. One way to test the dirty condenser theory is to leave it idleing at home and put a box fan blowing through the grill. If it cools off it could be one of two things. Either the condenser is dirty or the fan clutch Is week. Too test the fan clutch try stopping the fan with your hand when the motor is at normal running temp. The blades are plastic and will not hurt you. If you can stop the fan by hand your fan clutch is bad and not pulling enough air through the condenser when stopped this will cause the head pressure to rise and your AC will stop cooling.

Yeah if the fan clutch isn't bad and locks up like it should it will hurt you bad. Never grab a fan. Ever. Vicus fan clutches. They are filled with viscus grease. It's soft and slips when cold.
When it warms up enough it gets hard and grabs fast. Don't put your hand in a fan. Please.