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1990 BMW 525i pressure test?

Tiny
RED9227
  • MEMBER
  • 1990 BMW 525I
Engine Cooling problem
1990 BMW 525i 6 cyl 250000 miles

Hi how do I pressure test the cooling system after I replace the hose? Thanks again
:)
Sunday, August 23rd, 2009 AT 10:28 AM

1 Reply

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Well, one way would be to obtain a cooling system pressure testing pump and the appropriate adapters. Or to fill the system, open the bleeder screw on top of the thermostat housing and fill the system until all the bubbles stop and close the bleeder, top the system off, cap it and start it up with the heater to full hot. Find the leak b4 you put coolant in, just use water until you're sure it's fixed, then drain the system and refill with coolant/water mixture.
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Sunday, August 23rd, 2009 AT 2:26 PM

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