Overheating BMW 528 - help!

Overheating BMW 528 - help!

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deutscher

Original Poster:

1,430 posts

224 months

Wednesday 11th October 2006
quotequote all
The wife's 528i (1996) has had an occasional, but regular, overheating problem over the many years we've had it.

The problem has always been caused by a failed thermostat. They seem to last about 30,000 miles, although one failed after about 5,000 miles.

Is this a known problem?

The car has just had its fourth one fitted, but overheated again the following day.

My money is on yet another faulty unit being fitted, but are there any other explanations?

Your views appreciated.

thong

414 posts

237 months

Wednesday 11th October 2006
quotequote all
deutscher said:
The wife's 528i (1996) has had an occasional, but regular, overheating problem over the many years we've had it.

The problem has always been caused by a failed thermostat. They seem to last about 30,000 miles, although one failed after about 5,000 miles.

Is this a known problem?

The car has just had its fourth one fitted, but overheated again the following day.

My money is on yet another faulty unit being fitted, but are there any other explanations?

Your views appreciated.

they are known to suffer with stat problem's,but you do seem to be getting though to many.

stevesingo

4,864 posts

227 months

Wednesday 11th October 2006
quotequote all
It may be fitted with a water pump that uses a plastic impeller. Over time the vanes on the impeller fall off and you loose cooling.

Steve

deutscher

Original Poster:

1,430 posts

224 months

Friday 13th October 2006
quotequote all
Thanks for the advice guys.

Turned out that the failure of the previous thermostat and subsequent overheat blew out the radiator and damaged the water-pump seals. Nett result: had to replace the radiator and water-pump as well!

We've had the car from new and it's now done 175,000 miles so I suppose I can't complain too much about two water-pumps, three rads and four thermostats over this time.