I just installed a new aux water pump and what difference it makes in temperature at idle. I bought the 1985 300D June of 07 and removed the aux water pump and replaced it with a plastic 90 deg elbow. I noticed the air from the vents would cool off after idling. So I bit the bullet and bought a new pump from Auto Parts Warehouse. The pump came today and I ordered it on Friday.

I conducted a little test to see how much increase in temperature I would get with the pump.

-engine idling at temperature
-outside temp 28 F
-all doors and windows open
-climate control set to "EC"
-temperature wheel set to max temperature

I unplugged the electrical connect to the pump and waited 5 minutes and got a reading of 102 F out of the driver's side vent. Then I plugged the pump in and waited 5 minutes and got a reading of 122 F. I noticed the engine temperature dropped from 85C to 79C.

I drive about 15 miles to work and it is a lot of stop and go. I never get above 45 mph. This should reduce heatup time and improve comfort level.

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1985 300D Turbo Diesel 268,000 miles
1998 F150 4x4
2004 Honda Van
1970 Olds 455

http://www.peachparts.com/shopforum/...ine=1198976376

Thats the only time its useful. 102*f is still pretty warm.

you should put a 1 amp fuse inline with your new pump....could take out your acc or worse

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VegStew
1983 300SD 70,000 WVO Powered miles
1990 300D In driveway with Head Off - Cracked

I did install the 1 amp fuse when I put the pump in. My ACC was fried when I got the car. I fixed the circuit board traces.

Thanks for reminder on the fuse. I would not want to fry the ACC unit again.

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1985 300D Turbo Diesel 268,000 miles
1998 F150 4x4
2004 Honda Van
1970 Olds 455

http://www.peachparts.com/shopforum/...ine=1198976376

Since it can take the rest with it.