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Thermostat and Water pump replace -

Thermostat and Water pump replace

by Bestparts .ca on July 22, 2019 Categories: Bestblogs

I need a thermostat replaced do I need to replace the water pump as well?

Typically, the scenario is the reverse: that is the water pump fails and the question is should the thermostat be replaced at the same time that the water pump is replaced. The answer is absolutely because the thermostat itself can be damaged if there is an episode of overheating and, of course, a water pump failure is often associated with overheating. However, if the thermostat itself is the failure, it is only recommended to replace the water pump if it requires a lot of labor to get to the thermostat AND the water pump happens to be adjacent to the thermostat housing. In practical terms, that means that if the water pump is rendered accessible because you are replacing the thermostat then, yes, as a form of cheap insurance against future breakdown, you should go ahead and change the water pump as well, while you are in there. However, if the water pump is not made "accessible" while replacing the thermostat then there is no need to replace the water pump at this time if it is functioning and not leaking. The OEM thermostat is recommended. Sometimes aftermarket thermostats do not work as intended or fit properly. If you desire that a mechanic handle the replacement, please request thermostat replacement and a certified mechanic from Your Mechanic will perform the replacement and install the water pump, as well, if you desire. If you have further questions or concerns, do not hesitate to re-contact Your Mechanic as we are always here to help you.

On some cars the water pump is driven by the timing belt so it’s a good idea to replace the pump while the belt is being changed. Given that the pumps and thermostats do wear out I would say yes. And a pump replacement at a later date is going to require re-doing the entire job and the additional labor to drain the coolant and replace the pump while the whole rest of the timing setup is off the car is “marginal”. Same goes with the thermostat. In order to replace it you have to drain at least part of the coolant and depending on the vehicle maybe most of it. A thermostat itself is a very cheap part so while you have the water pump off, with the coolant drained, it’s a cheap way to do the thermostat as well.

Of course that gets to the whole “while I’m in there, I should do x,y, and z” scenario where a reasonably priced job all of a sudden costs a fortune. For example, on my wife’s old Acura MDX to change the timing belt I had to remove one of the motor mounts. It was good but already out, should I replace it? How about all of the V belts that were already off? Flush the coolant out? Sure, why not.

But my bottom line is that if the pump is driven by the timing belt replace it and the thermostat as well. If it’s not driven by the timing belt replace it on the recommended service interval of the manufacturer or if it starts to fail.