overheating
Moderator: martauto
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325icab
- E30 Zone Newbie
- Posts: 110
- Joined: Mon Apr 18, 2005 11:00 pm
- Location: leicester
jus a quick question i hav just put my head back together after the last 1 cracked, but it is still overheating. iv changed the thourmostat now and the waterpump 2 years ago. there is no water going through the pipes, i hav a feeling the pumps gone, can any1 confirm this
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Brianmoooore
- E30 Zone Team Member
- Posts: 49359
- Joined: Mon Jan 10, 2005 11:00 pm
325 M20's can be right ba***rds to bleed. You sometimes have to release air from the top heater pipe as well as the front air bleed.
Pump isn't exactly hi-tec, it's a pulley on the front and a rotor at the rear. Doesn't normally give any problems on the M20, (unlike M50), except for leaking of course.
Take out the thermostat and check it in near boiling water, and check that water flows freely through the rad.
Finally, are you sure it's overheating? Could be just a dud brown temp sensor.
Pump isn't exactly hi-tec, it's a pulley on the front and a rotor at the rear. Doesn't normally give any problems on the M20, (unlike M50), except for leaking of course.
Take out the thermostat and check it in near boiling water, and check that water flows freely through the rad.
Finally, are you sure it's overheating? Could be just a dud brown temp sensor.
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Karan
- Married to the E30 Zone
- Posts: 8004
- Joined: Mon Jan 10, 2005 11:00 pm
- Location: Cheshunt, Hertfordshire
may be worth just whacking a new rad in........ 
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Borderbmw
- E30 Zone Regular
- Posts: 452
- Joined: Mon Mar 07, 2005 11:00 pm
- Location: Scottish borders
A little tip i learnt when i was an apprentice was to drill a 1/8" (3mm) hole in the frame of the themostat,so that air can travel round before its open,just make sure a thermostat that sits sideways that the hole is at the top. makes bleeding systems a lot easier and quicker.
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Karan
- Married to the E30 Zone
- Posts: 8004
- Joined: Mon Jan 10, 2005 11:00 pm
- Location: Cheshunt, Hertfordshire
cool idea...Borderbmw wrote:A little tip i learnt when i was an apprentice was to drill a 1/8" (3mm) hole in the frame of the themostat,so that air can travel round before its open,just make sure a thermostat that sits sideways that the hole is at the top. makes bleeding systems a lot easier and quicker.
