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Old 07-19-2004, 10:29 AM
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Join Date: Jul 2004
Location: Annapolis, MD
Posts: 650
300SD running hot. What's next?

I replaced the waterpump just in case, and put in an Autozone thermostat (I know, I was impatient and haved since ordered an OEM) due to high temps. In stop and go traffic with the AC on in 80 degree weather I was getting to 110 and shutting down the AC and even turning on the heat.

I removed the radiator (only 6 years old) and thoroughly hosed it out - it was very clean. I used a hose to run water back through the engine. I cleaned all the fins on the radiator and condensor. Removed and checked operation of fan clutch.

Sitting at idle for 20 minutes with the ac on (fan comes on), temp goes up to 100 in 80 degree weather.

I finally removed the thermostat and drove to work this am. Never even got to 80c on the gauge - about what I expected. On the drive home today, I'll see how hot it gets, but I'm pessimistic. I did a search on burping, but the consenus seems to be that after a while, it will burp itself.

One odd thing is that the coolant in the resevoir is never even warm. The lower radiator hose is much cooler than the upper. The radiator is hot at the top, becoming cooler at the bottom - I would assume that means the radiator is working, no?

When the thermostat comes in, I'll give it a try, but in the mean time, any ideas? By the way, a screw broke off of the t-stat housing (apparently common). I was able to drill it out a retap (english threads - gad) and put in a new screw.

My wife's new 300SD sits and smirks at me while I'm figuring out all these problems on mine. Pampered ***** (the car).

Thanks for the help!
__________________
1984 300Sd 210k

Former cars:
1984 300D 445k (!!) (Strider) Original (and not rebuilt) engine and transmission. Currently running on V80 ( 80% vegetable oil, 20% petroleum products). Actually not, taking a WVO break.
1993 300d 2.5 275k. Current 120/day commuter
1981 300SD 188k (Hans) Killed by a deer
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