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Old 09-11-2014, 04:57 AM
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2003 x5 4.4, thermostat or fan clutch

I had my radiator replaced and my expansion tanks,
after about 15-20 min of driving around town my gauge goes to 3/4, and sometimes goes back, if i turn on my heater it goes back to normal for a while then goes back to 3/4,

before i replace both, i would like some ideas,

Thanks
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Old 09-11-2014, 07:28 AM
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thanks trader,
i tried the newspaper method and i was able to stop it when the car was at tempature,
i also held the upper radiator hose and felt the hot coolant come out the engine,
ill do me test and report my finding later today
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Old 09-11-2014, 09:50 AM
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Check that the shop correctly bled air from the system (milk hoses, use air vent, set heater to full hot setting, etc.). I'd also lean towards a thermostat issue but if this new conditions is ENTIRELY since the radiator replacement - this might indicate the cooling system has residual air in the system.
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Old 09-11-2014, 01:06 PM
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You also want to check the water pump. You can look for around the water pump shaft and housing for weeps. I gauge a BMW water pump by mileage. They could start to go anytime after 75k on average. In some cases the impellers wear and they don't leak and don't circulate enough coolant.

If you car's temp only rose when at a stop I would look at the fan clutch.

The radiators if maintained are pretty good, usually if they get clogged do to poor maintenance it will always run hot.

All the over flow tanks crack and leak but wont cause it to run hot.

Don't let the problem go on for a long time or if you have a water cooled alternator like me it will wipe that out too.
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Old 09-11-2014, 06:53 PM
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The symptoms you describe point towards a thermostat needing to be replaced.
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Old 09-13-2014, 03:28 AM
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Check the bottom of the rad. If the tops hot and the bottoms cold it's the thermostat. Just had the exact same with mine 300 miles from home.
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