2003 BMW 525 overheating

Tiny
RRAUL
  • MEMBER
  • 2003 BMW 525
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
When the radiator builds up pressure there is a crackle in or around the thermostat area. I release the pressure thru the pressure vaulve the whose feels like it has no pressure and the radiator starts heating up. What do you think that this could be? Can it be the thermostat or the water pump? Please let me know. Thanks.
Saturday, January 5th, 2008 AT 10:26 PM

5 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

Thank you for your donation.

I would start by replacing the thermostat and having the radiator cleaned professionally. Ensure that the system is bleed of air correctly including the heater system.

Mark (mhpautos)
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Sunday, January 6th, 2008 AT 12:45 AM
Tiny
RRAUL
  • MEMBER
  • 8 POSTS
Were do you check the heater system? You dont thick the water pump is bad?
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Sunday, January 6th, 2008 AT 1:43 AM
Tiny
RRAUL
  • MEMBER
  • 8 POSTS
Were do you check the heater system? Doyou think the water pump is bad?
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Sunday, January 6th, 2008 AT 1:46 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

When bleeding the cooling system, just make sure the heater is on hot so air can bleed out of the heater core, when engine temp is stable, just feel both heater hoses and make sure that they are both hot to touch, and the heater is blowing hot air. I would no be considering a water pump at this stage of the investigation of your problem.

Mark (mhpautos)
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Sunday, January 6th, 2008 AT 2:11 AM
Tiny
RRAUL
  • MEMBER
  • 8 POSTS
Thanks!
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Sunday, January 6th, 2008 AT 2:48 AM

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