Checking the Operation of the Shut-Off Valve

Checking The Operation Of The Shut-off Valve







Start the engine and run it at idling speed.







- Select maximum cold for both zones.
- Check that the temperature of the heat exchanger return line drops.

Does the temperature drop?

NO - Checking the Vacuum Hoses

YES - Continue with Checking The Operation Of The Shut-off Valve.

Check the operation of the air-blending flap. Note also that capacity will drop if the fresh-air filter is clogged.

After performing this procedure Final Check