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300D overheating
My 1992 300D has run hot since I moved to Arizona. I've replaced the radiator, thermostat, cleaned the A/C condensor and have a 50/50 mix with wetter water. When I run uphill on I-17 at 75 mph the temperture goes straignt to 115-120C. Turning off the air conditioner keeps the temp from going to 120. Is this normal? I've been reading on this site about "citric flush" which my local mechanic has never recommended. Any ideas??
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#2
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What about your electric auxiliary fan, or belt driven fan clutch?
The aux fan should come on at or around 105c, if not, check the temp sensor, they do go bad! |
#3
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one idea.... you could sell it to me cheap. then, i'll let you know how it runs in nuevo mexico. LOL.
another idea, have you blown the radiator and condenser out with air? get all the bugs and and dirt out you can. don't use water, it will just make mud. check your thermostat to see if it's opening all it should. where is the temp sensor for the electric fan located???
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Current money-pits: 96 Passat TDI 78 300D 100k miles(60miles/day)FOR SALE 91 Jetta Diesel 250k miles (80miles/day) 82 Toyota Diesel pickup 150k miles; out of service for a little while with a valve problem. All on BelenBioDiesel Past diesels: 01 Golf TDI 81 Isuzu P/U 85 Jetta 89 KW 425 cat 85 Pete 400 cat (currently still running the west coast with over 1.5 million miles) 81 KW 400 Cummins 77 Freightliner CO ???? Cummins (Buttercup) 57 180D lots of miles(gone but not forgotten) |
#4
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Quote:
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#5
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Ideas
Quote:
Aux. Fan Resistor Auxiliary Fan Assembly Engine Temp. Sensor Fan Clutch... Water Pump A/C ACC Temp Sensor A/C Temp. Switch
__________________
ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
#6
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Quote:
75mph produces a lot of 'ram air' effect, so I don't think the auxiliary fan adds much to the airflow. Ditto the engine-driven fan. The cooling is determined by the radiator effective area and the water pump flow rate. Quote:
It sounds like it is not overheating, it is just running at the hot end of allowable. Given high ambient temperature and high horsepower requirements, it is to be expected. By the way, what does the temperature gauge read when you are going downhill? It should drop back to 80-85C... Best Regards, Jim |
#7
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300D overheating
Thanks for the help. The temp drops bak to 80C when the car goes downhill. Temperature is a factor, but the car will get hot going up hill in cool weather without the A/C. My local mechanic--very good--says this high temperature is normal. I'm wondering if I need to flush. Everything else has been replaced or checked.
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#8
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Quote:
I think you can trust your mechanic. Watch it for a while. A flush won't hurt, but it may not help, either... Best Regards, Jim |
#9
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Does Auxiliary Water Pump useful for reducing overheat?
Can I replace the expansion plastic tank with a bigger one on my 300E86? What is compatible? |
#10
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only thing
left is the water pump. i would prob change that. be sure to get the origninl style with the cast impeller blades.
tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
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