Mercedes 320

elect70, May 5, 8:12pm
The heater wont work the 2 valves are opening but no hot water flow & i notice the engine seems to run at only about 70C should be up around 90 even after a hard run .

strobo, May 6, 2:08am
You checked the thermostat first ?and reverse flushed the cooling system and heater core in other words done a pre winter service?.always check thermostat first while doing a flush. Should be up around 90d/c you are correct. Then go from there!,The 320 has a myriad of common faults in its heater system just saying.

poppy62, Aug 11, 1:14pm
Check the heater valve under the wiper assembly it controls thr coolant flow from engine to heater.