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holden

Adding a circulation pump with 2 heaters, relay switch? How?

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holden

I've searched and seen references to the use of the relay but have no idea how to make this work and what kind of relay I should purchase?

2 heaters, one circulation pump. I want to have the fans for the heaters independently switched. One will be at front on dash, other control at rear.

I want to have the circulation pump come on regardless of which heater is turned on. Obviously if both heaters are on, the circ pump should be on too!

How to I make the connections? Thanks in advance.

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FastFreddy

I've searched and seen references to the use of the relay but have no idea how to make this work and what kind of relay I should purchase?

2 heaters, one circulation pump. I want to have the fans for the heaters independently switched. One will be at front on dash, other control at rear.

I want to have the circulation pump come on regardless of which heater is turned on. Obviously if both heaters are on, the circ pump should be on too!

How to I make the connections? Thanks in advance.

You would need two relays. Each switch to the heaters would activate a relay each.

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SmoothWaterMan

Skip the switch, wire the pump to run when the engine is running.

Peter

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FastFreddy

Skip the switch, wire the pump to run when the engine is running.

Peter

Thats a good idea. Even if its hot out the heaters won't put out much heat since the fans arent running. Much simpler!

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Parrothead

You can run the pump when engine running true, but will still need a two switches and two relays. FAN%20SCHEMATIC.jpg

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Parrothead

This is a simle schematic the wire that says PCM (fan relay one) is where your switch would go. You would splice off the positive feed to the fan to the circ pump if you do not run all times while engine running.

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tvano

Skip the switch, wire the pump to run when the engine is running.

Peter

i thought that the purpose of the circulation pump was to gain heat from the hot block while the engine was off.

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