Question about 2001 Jaguar S-Type

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My heater doesn't work

My AC works great, but the heater doesn't work at all.

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I got similar problem on a 1998 XJ8 a few weeks ago. It turn out to be a dead auxiliary coolant pump. This is an electric pump that help pumping the hot coolant into the heater core when the engine is at low revs. The main engine coolant pump is not sufficient to provide enough coolant throughput to the heating system on some cars, so a auxiliary electric pump is required. If this is your problem, you might still get a little hot air when driving at high speed. If this is your problem and are a do-it-yourself, you can even save the price of a new pump by just replacing the auxiliary pump carbon brushes. They are most likely completely worned after 13 years of service. My brushes have a 4x4mm section, yours might be different. If you do not find exact size, carbon brushes can be cut and/or sanded to size.

Posted on Dec 31, 2013

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Posted on Jan 02, 2017

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