2003 BMW 525 overheating

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.

5 Replies

MHPAUTOS

MECHANIC
31,938 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

RRAUL

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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

RRAUL

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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

MHPAUTOS

MECHANIC
31,938 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

RRAUL