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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 01-21-2013, 12:33 PM   #1 (permalink)
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Coolant hose trouble... need help identifying hose

bmw 325is 1989 m20


No leaks on the engine just got timing belt, water pump, crankseal, everythong was going fine heater and ac have always worked but a week after i got a new radiator cap this small hose burst and is dripping antifreeze on my hot engine..... never had that burnt antifreeze smell in my car which im positive is giving me cancer via my air vents so if someone could please help me figure this out

The hose is located dead center at the back of the engine running horizontal to the firewall and going into an inlet right beneath the fuel rail and the valve cover

When i took off my radiator cap to check the level i began hearing a hissing air sound from the hose and can see a rip/burst in the hose and while the engines running its only a minor drip but i really gotta stop the smell


- my heater and ac still work fine and my heater hoses running into the firewall look ok.
- temp gauge rises a bit at stop lights after sitting a min
- havent run out of coolant or gotten check engine light but a couple times at stops i was steaming up good and smelling things up
- cant find antifreeze puddles anywhere i can see

Ill try to take a picture on my phone but the hose looks like it a connects to the T shaped coolant hose running through the mid section of the engine


Any input is greatly aporeciated

Last edited by Eightynine; 01-21-2013 at 12:40 PM.
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Old 01-22-2013, 10:32 AM   #2 (permalink)
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Here is a diagram to the coolant system hoses:

Cooling System Water Hoses BMW 3' E30, 325i (M20) ? BMW parts catalog
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Old 01-24-2013, 10:12 PM   #3 (permalink)
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Originally Posted by Eightynine View Post
bmw 325is 1989 m20
When i took off my radiator cap to check the level i began hearing a hissing air sound from the hose and can see a rip/burst in the hose and while the engines running its only a minor drip...
Not meaning to be a wise guy, but, The first place to start is to replace the hose that has a rip/burst and a minor drip.

The hose going to the throttle body is obscured and is often over looked when people think they are replacing all their heater hoses. Radiator hose is cheaper than a tow from the side of a road. Replace them at your convenience and then not worry about them for a few years.
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