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#1
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I got a lot of good suggestions from my last post (1-16-00), but I still have the high temp problem. Up until 3 weeks ago, the temp in my 85 300D (202,650) never rose above 95* (in Summer with A/C on). Now it is running 85*-90* with heat on and up to 100* with heat off.
This is what I've done in the past week>>> 1. Replaced thermostat with 80* MB OEM unit (installed with arrow up!) 2. Replaced Expansion tank cap. 3. Flushed system 3 times 4. Replaced Radiator today with brand new radiator (not a rebuild). I also replaced the expansion tank and water pump about 9 months ago. Even with the new radiator, the car is still running a good 10*C hotter than it did only three weeks ago. I feel I just wasted $ on a new radiator as I am seeing no temp improvement over the old radiator. While flushing the system, I did so with the thermostat out. After 35 minutes, the temp never got above 50*C and the defrost was barely blowing warm. Questions: 1. Could it be a bad thermostat (even though I just replaced it) 2. Could it be a bad waterpump that is not showing visible or audible signs of wear. (I never have felt a surge when squeezing the upper hose at operating temp) 3. Could it be a bad temp sensor? (how do I troubleshoot?) 4. Is it gremlins? Thanks so much for replying with suggestions. |
#2
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As you have found, this is a hard one. You could have a bad gauge and or sender. You easily could have a faulty new thermostat. New doesn't mean good. There is an arrow on the thermostat that has to be clocked a certain direction. The other thing is that more than one degree of thermostat is available for your engine. Are you sure that you have the correct one.?
------------------ Benzmac: 1981 280GE SWB 1987 16V ASE CERTIFIED MASTER AUTO TECHNICIAN SERVICE MANAGER FOR 14 BAY FACILITY MERCEDES SPECIALIST 8 YRS PARTNER IN MERCEDESSHOP.COM |
#3
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Does your car have a thermally activated cooling fan? It could be slipping or sleeping.
And yes, audit your temp gauge and sender. Did you replace the cooling system components simultaneously, or one at a time? |
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