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Old 05-24-2021, 04:29 PM
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Join Date: Jan 2021
Location: Honolulu
Posts: 44
W123 Coolant Leak and Running Hot

Hey all,

So my '83 240D has been running perfectly for the last few months with no overheating issues or leaks, however yesterday while sitting in a drive through I watched the temp gauge climb to about 105 C. Kept an eye on it and once I drove away it cooled off back to normal operating temp. Then this morning there were two small puddles of coolant under the car. Some coolant ran down the exhaust dripped and there was another small puddle under the thermostat housing and water pump. There was fresh coolant on the hoses connected to the thermostat housing, so I tightened down the clamps as they seemed looser then they should be. Coolant level seems ok however. Is it possible the water pump is going out? Not leaking from the water pump as far as I can tell. I just don't see how losing only a little coolant through a loose thermostat housing hose could cause it to get hot so quickly. Thermostat was replaced about 6 months ago, no idea when the water pump was last done.
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