Hi. My other half's Mini Cooper (51) starts overheating almost as soon as its warmed up. It is fine when moving but as soon as we sit at lights the fan kicks in and up goes the temperature gauge. But it doesn't smoothly go up and down, it bounces up then holds, then up and holds, then up to maximum and the red light flashes. I tried the usual and added coolant but to no avail. I checked the oil which was a little low so topped that up. Still the same symptoms. This evening I sat watching the temp gauge go up after the fan kicks in. Then if I rev the engine the temperature drops to normal. I wait 30 seconds and the temp gauge starts rising and again I rev the engine and it drops again. Seems like nothing I've ever heard of before so I thought the best thing to do was to ask you guys.
I'm having the exact same problem. I've got an R53 (52 plate), last week in traffic the red temperature light flashed and then stayed on. Whenever I got going again it diasappeared - only seemed to overheat when idling. Called the RAC who agreed it was a coolant problem, refilled it and idled it for 10mins and the light didn't come back on and the guy couldn't see a leak. Today, the same thing happened, so I filled the coolant back up and I heard it gush out of somewhere and there was a big puddle on the floor! Whatever it is, looks like I'm going to have to take it to a garage
No interior heating is due to an lock and no water/coolant in your heater matrix......best not to drive the car until fixed or you will overheat and damage engine or blow the head gasket.
Could be leaking radiator, hose, water pump or thermostat.
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