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