[3dplane]

My heater core is restricted so I'm only getting barely noticable heat due to insufficient circulation. Flushing my heater core makes it a little better for a day or two then back to practically no heat.

I simply don't have the time right now to replace my heater core for this concern and I just did not want to use any chemicals in case it eats the radiator or my heater core.

So I had this idea to obtain an electric auxiliary coolant pump and hook it inline with the heater core to help circulation and see what happens.

Pump (used) ebay $40 to the door plus about $12 at auto parts store for a few 5/8" to 3/4" heater hose adapters and hose clamps. ( I had hose pieces)

Tested the pump's power draw: Dry,unloaded an amazingly little 185mA!!!(less than 0.2 Amps)
Submerged in a bucket of water 1.2Amps.
Installed in the car, engine on or off 0.9 amps!

Before installation I had one heater hose disconnected at the firewall and had a helper start the car for a moment to see where the coolant is shooting out to determine direction of flow. (car's heater core inlet hose goes to the middle of pump and discharge port of pump (on it's side) goes to heater core inlet on car)

Not only do I have a working heater now but once up to operating temp I can EOC with the key turned back on for blower operation and the heat "never" goes away during my coasts.

I tested how long would it take for it to run the heat out of the shut off engine and I lost patience after four minutes. It have not dropped noticable temperature (sitting on my yard).

I thought some of you in the colder climates doing lots of EOC might want to think about giving it a shot if you lose your heat during EOC! I'm very happy with it especially that it draws less than one amp plus my blower of course!
Hooked it up to a switch on my dash.
Barna