1993 BMW 525i noisy valve or pump

Tiny
TKPETE
  • MEMBER
  • 1993 BMW 525I
  • 6 CYL
  • 2WD
  • MANUAL
  • 17,000 MILES
The heater valve and pump are attached to the firewall on the driver's side. The combined unit makes a noticeable whinning/whirring sound, so I'm sure it's either sticking or slowing down, but I can't tell if its the valve or the pump that needs service/replacement.
How can I troubleshoot it to determine the problem?
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Friday, September 11th, 2009 AT 1:31 PM

1 Reply

Tiny
DR. HAGERTY
  • MEMBER
It's the pump.
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Saturday, September 12th, 2009 AT 9:42 AM

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