Join Date: Oct 2008
Location: Gold Coast, Queensland, Australia
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Had similar overheating problem with my '97 528i:
1)Started getting hot at idle, traffic lights etc - diagnosis: new fan hub - $180
2)OK for a few weeks, started getting hot at idle again- everything checked again, cracked head-$3600 for re-manufactured head (fitted)
3)OK for one week then temp gauge started going to 3/4 mark for a minute or so before returning to normal- new thermostat, by this stage no $ -going onto a bill
4)Temp gauge still moving at random engine speeds; back into shop- diagnosis low speed auxiliary fan not working and I suggest faulty coolant temp sender- possibility but never heard of before.
5)Engine temp taken with external laser gauge with car gauge showing hot-74 deg celsius rising to 100- normal temps.
6)Fitted after-market digital temp unit reading head temps Maximum temp reached 86 deg celsius
7)New Dual temp sensor fitted (in side of head under inlet manifold) and new low speed resistor pack in aux fan- all problems solved after 6 months.
8)The next thing we would have looked at would have been the-in dash gauge itself
9)if anyone is interested in the digital unit I installed simply google "engine watchdog TM2"
it's available here in Australia, but they will send it any where in the world, even reading in deg F
AN EXTREMELY SENSIBLE AND USEFUL BIT OF EQUIPMENT AS IT IS EQUIPPED WITH A SETTABLE ALARM THAT GOES OFF AT HIGH TEMP.
Last edited by tezza07; 04-03-2009 at 08:31 PM.
Reason: left out some vital info