Retaining heat use during EOC

[teoman]

Departure time has a big influence on my morning commute of 17 km.

At 5:55am it takes 18 minutes and 4.5 l/100 km. At 8 am it takes 6.5 l/100km and an 1 hour.

[funkhoss]

Originally Posted by Daox

I'm not sure about the rest of you, but around here it has sure cooled off quickly. [...]

12V coolant pump



I'm very open to other ideas for retaining heat use with the engine off, but this seems to be the simplest I can think of.

The next step would be how to turn it on only when the engine is not running. I don't really have any thoughts on that so far, so I would love to hear you guy's thoughts on how we could do this.

Thanks, Daox, for this great idea! I, too, get tired of having mostly cold air in the wintertime due to EOC. So, I bought two of these pumps and installed one in each of our cars. I'm very happy to report that it works! No more cold air!

I wired the auxiliary coolant pump into the 12v ignition ON circuit (with a fuse) using a relay that I installed and connected to the fuel pump circuit. When the fuel pump runs, the auxiliary coolant pump turns off; otherwise, when the key is on the auxiliary pump is running. In the summer, I can just disconnect the auxiliary pump from the relay to keep it from running.

The only catch I discovered is that the pump linked above is designed for 3/4" hose, not 5/8"--so I had to use adapters in order to connect it to the 5/8" heater core hose on both cars.

Again, I just wanted to report that this works very well indeed. Thanks again for the excellent idea!

-Funkhoss

[Daox]

That is awesome Funkhoss! Thanks for reporting back. I'm really glad to hear it worked so well. Also, thanks for the heads up on the pump inlet and outlet size.