Rewiring Heater pump to NOT run all the time? Been Done?

[Holdmybeer]

Check your heater plumbing circuit.

The pump is running to keep hot closed loop coolant circulating. The heater core will not provide any cooling benefits to the engine but if not running the pump restricts coolant flow it was cause problems.

If the heater coolant lines circuit are independent of the other engine cooling, I would definitely go the route you are thinking. No reason to run something 100% for no reason.

[996scott]

I would be really interested in this as well. I have replaced my pump once already and a little uneasy waiting for it to happen again.

[KnoxMojo]

If you don't care about heat, just pull your hoses and run a barb fitting between the 2 and unplug your pump. That is what you do when you have a leak anyway. Wiring a local switch to behind the seat wouldn't be hard. Just run it inline with the pump for on off. Running to the dash would be harder of course. You can also buy the pump housing off amazon for under $100. Don't ask for the link use google search or amazon for sureflo and off brand replacements will come up there are aftermarket.

[996scott]

I know almost nothing about electrical stuff but I would think that you could unplug the electrical connection from the circulating pump and then tap into the wiring that turns on the blower and connect that to the pump as well. That way when you turn on the heater the blower AND the pump will both turn on? Or am I way off base?

[Holdmybeer]

I would want them on 2 different switches.
Like Knox said, leave the fan switch on the dash but add a switch under the seat for just the pump. This way you have ambient air without the pump and heat with the pump.

However, make sure the pump coolant line are aux hose loops and not part of the main
trunk system. Otherwise, you are going to add restriction to the cooling loop by not spinning the heater pump and could overheat the engine.