Why heater stop working after replacing water pump?
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?