1991 BMW 525i Overheating

1991 BMW 525
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PJULIAN
  • MEMBER
  • 1 POST
My BMW is overheating. Radiator has been flushed and I replaced the thermostat. There is no problem with the return. Does the aux fan kick on when the temp goes up, plus she overheats in about 5 minutes.
Apr 8, 2006 at 6:37 AM
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SUNWINMAN
  • MEMBER
  • 3 POSTS
Hello buddy,

please make sure that coolant is not leaking and once u filled the coolant hope u have done the coolant bleeding also to remove the air.

If the engine heats up when the car is idling,then there is a problem with the fan clutch.

with regards,
sunwinman
Jul 8, 2006 at 7:35 PM
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2CARPRO JACK
  • ✓Experienced Mechanic
  • 11,533 POSTS
the aux fan should come on when the engine gets hot.Have it chemical tested for a blown head-gasket so you dont chase your tail replacing parts
Jul 24, 2006 at 6:00 AM
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Suggested Repair

Confirm the auxiliary fan comes on as the engine gets hot, and have the cooling system chemically tested for a blown head gasket before replacing more parts.

Conversation Summary

The owner of a 1991 BMW 525i reports overheating within about five minutes after the radiator was flushed and the thermostat replaced, and asks whether the auxiliary fan should come on. A reply suggests checking for coolant leaks, bleeding air from the system, and considering the fan clutch if it overheats at idle. The expert says the auxiliary fan should come on when the engine is hot and recommends a chemical test for a blown head gasket.

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