Automatic Climate Control System heating performance and operation of pump valve unit, testing: Notes

NOTE:

This test covers the operation of the pump valve unit, as well as right and left heat regulating valves -N175- and - N176-, and coolant pump -V50-.
If a difference from the specifications is found, perform electrical test. See AUTOMATIC CLIMATE CONTROL SYSTEM, ELECTRICAL .
If there are complaints of heating system performance and if during testing, no malfunction of pump valve unit is found, check coolant hoses (from engine and from heater core to pump valve unit) for proper installation. See PUMP VALVE UNIT, REMOVING AND INSTALLING and COOLING SYSTEM, CHECKING FOR LEAKS .