How to Replace a Blazer A/C Valve

An air conditioner valve varies the coolant flow depending on a vehicle's needs. If more air is needed, the valve expands wider so more coolant can be supplied to the evaporator. The valve opening will close to reduce the coolant flow if it is not needed. A sensor bulb monitors the vehicle's cooling needs. If the AC begins having problems, you may need to replace the valve in your Chevrolet Blazer to get it working properly again. The steps vary slightly depending on your vehicle, but the process is basically the same.

Instructions

1

Disconnect the Blazer's AC lines that lead to the evaporator with a wrench.

2

Remove the screws that secure the lower half of the evaporator. Loosen the water drain tube with a wrench.

3

Unscrew the airbag harness with a wrench and pull it out through the opening. After the airbag is removed, you can unscrew the bolt that holds the lower half of the evaporator. Pull out the evaporator.

4

Loosen and remove the screws and clips that keep the evaporator closed. Open the evaporator to reveal the valve. Remove the valve with a wrench.

5

Lubricate the O-ring for the new valve. Side it where the old one was and replace the valve.

6

Replace the evaporator and the air bag. Try out the air conditioner to see if this fixed the problem.