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Old May 24th, 2014, 12:33 PM
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coolant

Need help with coolant, water temperature getting up to 105/108 c, the fan is kicking in but the radiator and bottom hose staying cold. I thought thermostat so changed the housing, still the same, why would a fan start when nothin to cool. 2007 R56.
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Old May 24th, 2014, 01:12 PM
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A very good very efficient radiator will be hot at the top and cool at the bottom, it shows its taking away the heat properly?
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Old May 24th, 2014, 10:48 PM
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Had a finding today. Took for 5 mile drive, pull in drive, temp at 107c, checked bottom hose, cold, shut engine off and electric pump kicked in and after only a few moments the radiator and bottom hose start to warm up and then get hot. So coolant is moving around the system but not until engine shut down.
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Old May 24th, 2014, 11:11 PM
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If your thermostat is ok you either have an airlock or your waterpump is shot or fanbelt slipping badly.
Driving normally your engine temp should sit around 90 to 95 but will rise in queuing traffic etc, if its reaching 105 whilst driving along you have a problem also if its reaching 105 & the radiator is cold then the coolant isnt circulating. You haven't got an electric pump the noise you are hearing is the fan
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Old May 25th, 2014, 02:40 PM
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If you changed the thermostat (and not just the housing), then the only thing left is the water pump.
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Old Jun 2nd, 2014, 07:11 PM
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Hi jackhd, i have read though your problem and I am a mini mechanic in the main dealer, I would recommend clearing the fault memory in the car, if a fault is stored for the map-thermostat it will go into a safe code making the fan to run a lot. Clear fault memory and re-test, let me know how you get on.
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