Hi,

I have no heat on my 1990 W124 2.5TD. Sometimes the heater blower motor does come on after a very long time (20 minutes) and sometimes it does not come on at all. It seems that I hear some ticking sound in the dashboard area.

When the heater blower motor comes on sometimes, the heat seems to work. I changed the heater valve and auxillary water pump last year.

Anything I should check? I appreciate any guidance. Thanks.

Best Regards,
Louis