Why heater stop working after replacing water pump?

Asked by Equinox_2073 Dec 11, 2020 at 04:20 PM about the 1996 Mercedes-Benz S-Class S 320 LWB

Question type: Maintenance & Repair

I have water pump on my 2000 Jaguar S-Type and 1996 Benz S-320 replaced
at different time. Each time the heater in each one stopped working. I advised
to replace heater-valve exchange in each of them. This was done on the 1996
one, still the heater is just blowing cold air. My question is what could be
responsible for this?

1 Answer

3,105

Low coolant, Stuck open thermostat, Air in the cooling system, or heater-valve exchange. Could be one of these.

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