QuestionI have a 1997 chevy suburban. Ac unit in the front works ok. A/C blows cold air. The back part of the suburban does not cool the back fan motor works fine it blows hard but blows hot air while the front blows cold air. Why would that be?
AnswerHello Dwayne
We are a UK company and not familiar with your vehicle. The following is a guide only and may help you
Does the rear system have a separate evaporator and expansion valve ?
If so with the system running get underneath the vehicle and locate where these are, they will be from the center of the vehicle rearwards under the passenger or driver sill or right at the back underneath the luggage compartment
Locate the point where they enter the vehicle and get your hand on the pipes, one should be cold and one should be warmer (the thin one)
If they are the same temperature the expansion valve is not working properly, before you go stripping it make sure the vehicle has the right amount of gas. Only an approved a/c center will be able to tell you this. Low gas is the most common reason for poor rear a/c.
If there is a separate rear control for the heater and a/c there will also be a control to shut off the hot water supply to the rear heater. This is a common failing on the Chevrolet Day Van for example.If the separate rear control is electronic there could be a problem with a temperature sensor if you have one.
If there is no separate control and expansion valve for the rear the cold air from the front is only ducted to the rear coming out on the rear passenger feet, usually in the tunnel behind your gear shift.
Make sure the flap is opening to allow this to happen.
See how you get on with this and let me know if you need more help
