Air trapped in Engine Block help please

Tiny
ATHLON1
  • MEMBER
  • BMW 318
I was driving my car and check engine light came on and my car overheated. I checked my radiator cap and it was partially opened with coolant coming out. I had a problem with air bubbles in my cooling system and I had a mechanic fix it. What is the step by step procedure to bleed the air out of my 1993 bmw 318i?
Sunday, September 30th, 2007 AT 7:21 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
BLEEDING COOLING SYSTEM:

Always bleed air from cooling system after replacing coolant. Set heater for maximum heat. Remove radiator cap. Loosen drain plug and remove drain bolt (if equipped) from engine block. Drain coolant reservoir. Fill coolant reservoir to MAX mark with 50/50 water-coolant mixture. Loosen bleed bolt and fill radiator up to base of filler neck. Close bleed bolt when coolant flows out without bubbles. Tighten bleed bolt. With radiator cap removed, start and operate engine to normal operating temperature. Add coolant if necessary and check for leaks.
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Monday, October 1st, 2007 AT 12:25 AM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,603 POSTS
Razmataz is right about everything except that the
M42 motor in the 318 has no bleeder screw
just loosen the cap and run until you get the air out
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Monday, October 1st, 2007 AT 4:31 PM

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