Addition coolant pump install ideas/suggestions/problems?

[iblackwe]

I was thinking of installing a second coolant pump into the system because I have noticed that at long intersections i can watch the temperature gauge creep while idling. I have thought of tuning to increase my idle to 1000rpm to get better flow but I am not sure that would help either? But if anyone has done that I wouldn't mind knowing the results!

I have the Bosch pump from the AWIC setup and was thinking of buying another pump to install on the cold side of the radiator to keep the coolant flowing.

Has anyone done this? Does anyone know if there will be any issues with the thermostat if that pump is constantly trying to push coolant through it? Would it be smart to wire it in with the radiator fans to kick on when they do?

Just food for thought, let me know if anyone has ideas for this!

Thanks!

[matteo92065]

I would like to know more about your temp readings.
Is this all based on the Subaru gauge, or an aftermarket gauge? I believe the Subaru gauge has a huge dead zone, where the needle will not move for a specified temperature range. When it does eventually move high, it is HOT.
My Subaru gauge will not move at a light (or anywhere else), but if I watch the Accessport coolant temperature it will go from 185ish to 200ish? before the fan(s) kick on. Then the temp will drop right back down. I think my car will safety idle indefinitely. My engine is mostly stock 06 WRX.

We installed a Meziere (https://www.meziere.com/Products/Cooling-System-Products/Pumps-Electric/Remote-Mount/Electric-Pump-Remote-High-Flow-55-GPM.aspx) coolant pump on another 818 and I don't see any difference in flow compared to my car. This car has not been driven yet, just idled, so I can't speak of any other advantages/disadvantages.

It kinda sounds like you have air in the system still. Is that a possibility?

The Bosch pump will probably restrict the flow at higher rpm with its small ports.

[iblackwe]

Yea that's similar to my case, it's based off the Stock Subaru gauge and the fans kicking in. I notice that the fans with kick in and then the temp gauge creeps up fairly rapidly to above half when running temp is below half.

Shouldn't have any air in the system, I did Wayne's mod, tapping into the coolant track and diverting a line to the turbo coolant reservoir and I t runs at the proper temperature when in motion

I was wondering what you would think of tuning the car to have an high idle then? Say 1000 rpm or so, potentially getting more coolant circulating at a stop?

Thanks,
Ian

[Wayne Presley]

I would say that all is functioning properly, sitting at a light the radiator has no air flow so of course the temp will increase until the fans come on and restore air flow. 200°F is a non issue. Drive and enjoy the car

[Harley818]

mine operates the same as Matteo's. When it sits and idles, it slowly climbs to 205/206 using Accessport, then as soon as the fans kick on it drops like a stone to 185-ish, the fans shut off and will continue to do it all over again.
Subaru gauge reads in the middle with little change the whole time.
I agree with Wayne.... drive and enjoy.....

[ssssly]

Yea that's similar to my case, it's based off the Stock Subaru gauge and the fans kicking in. I notice that the fans with kick in and then the temp gauge creeps up fairly rapidly to above half when running temp is below half.

Shouldn't have any air in the system, I did Wayne's mod, tapping into the coolant track and diverting a line to the turbo coolant reservoir and I t runs at the proper temperature when in motion

I was wondering what you would think of tuning the car to have an high idle then? Say 1000 rpm or so, potentially getting more coolant circulating at a stop?

Thanks,
Ian

Does the temp continue to rise after the fans kick on?

If the temp goes back down after the fans kick on, no need to do anything.

However in this post it sounds like you hear the fans kick on, but then the temp continues to rise.

If that is the case you have a problem somewhere. The stock Subaru fans move more than enough air through the radiator to keep the temp to 185 at idle (unless it is extremely hot outside, over 100 degrees).

Even with the coolant tank reroute, you could very well still have an air bubble and that is the most often culprit with elevated idle temps. That or when someone puts extremely heavy weight oil in an engine with stock bearing clearances. That will also get you wonky oil pressure and temp reading though.