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#1
06-20-2006, 09:47 PM
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W123 300D overheating
My 85 300D has heated up to 120C and the coolant started to overflowed out of the reservior. I bought a thermostat during the winter for replacement, since the temperature took forever to get to 80C. Now that I replaced the thermostat, I filled the coolant reservior with water (for a flush). Started the car, the temperature gauge reached 80C very quickly, and still climbs up. It went up to 110C and still started to climb up. I turned off the car, and drained the water out of the radiator. The water was not hot, and it was like the same water(cold) that I put into the reservior. There are no water passing through the upper radiator hose. It seems like there's no water going to the engine to cool it down. Any suggestions?
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#2
06-20-2006, 10:56 PM
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Remove the upper hose from the radiator and add as much coolant to the hose as you possibly can get in. Quickly reconnect the hose to the radiator. Turn the heat on high with the temperature dial all the way up to the click stop.
Run the engine and see how it does. If it does not overheat, take it for a 10 minute drive with the heat on full (put the blower at low so you don't get completely toasted). Bring it back, shut it down overnight, and refill the reservoir in the morning. Keep an eye on the reservoir for the next several days. It will likely drop a bit each day.
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#3
06-20-2006, 11:26 PM
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What Brian is describing is "Burping". Opening up the coolant system, usually causes some air to become trapped and require this procedure.
Not to be callous, but did you verify the thermostat is facing the right direction? This can cause the same thing.
__________________
Sam 84 300SD 350K+ miles ( Blue Belle )
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#4
06-20-2006, 11:27 PM
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did you test the thermostat before replacing it? they can be defective- it's a cheap-o part... if it's not opening, that would give your results.
also sounds like it could be airlock- b.c. has the right idea for that. also, 20 year old temp sensors can be faulty.
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Cannondale ST600 XL Redline Monocog 29er 2011 Mini Cooper Clubman 2005 Honda Element EX www.djugurba.com www.waldenwellness.com
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#6
06-21-2006, 10:25 AM
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Just wanted to verify your description of the thermostat. The "spring" side should be towards the engine.
Also, if I recall correctly, there is a little "detent" for how the gasket fits on the thermostat. The gasket fit may be in error since it has been some time and I've slept since then.
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Sam 84 300SD 350K+ miles ( Blue Belle )
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#7
06-23-2006, 02:36 AM
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It seems like I fixed the problem with your help. At first, there was no heat. I idle for a good 15 minutes, but there was still no heat. I got pissed and revved the engine, heat started to come out! Now, the car runs at 90 - 95C.
I'm just curious, does the main clutch fan speed up at a certain temperature or no? Should the aux fan kick in too (assuming that it works, which mine doesn't)?
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#8
06-23-2006, 10:07 AM
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That is not uncommon. There probably is still a little air in the system. For the next couple of days, keep an eye on your coolant level and top it off.
The main fan clutch becomes "more engaged" with temperature increase. It kind of free spins until the right temp. From what I have read here, the aux. fan comes on with a couple of scenarios. One is with coolant temp. of 105C and the other is with the air conditioning.
__________________
Sam 84 300SD 350K+ miles ( Blue Belle )
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