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Old 12-15-2009, 06:00 PM   #1
3rd Gear Member
Join Date: Dec 2006
Location: Ottawa
Posts: 547
E30 problem

Hey guys,

The winter beater e30 has developed a bad coolant leak. I'm trying to get an idea of what the problem is, but I find I really don't know much about these cars. The leak is close to the firewall but down low. It's not the heater core hoses that are leaking.

I took a look at the diagram, and I'm suspecting it has something to do with the throttle housing assembly. Why the hell does it have water hoses connecting to it again? Where does hose #15 go? Also, could the leaking hose be #14? I can't get under my car to look.

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Old 12-15-2009, 06:56 PM   #2
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Join Date: Nov 2007
Location: Toronto
Posts: 3,428
2 hoses cool the intake manifold. there is a 3 way hose that runs from the therm housing and along the side of the block that goes to the back to the heater core area. You might have a split hose. It could be anyone of them. run the car and see where it is coming from.

I think I've had 18 bmw's in 6 years.

1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.
latest addition as of 2013-Gold 87-325is auto! it's a keeper!
KEEPER 88 5sp Vert 2016
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Old 12-15-2009, 08:07 PM   #3
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Join Date: May 2006
Location: Ottawa
Posts: 2,018
cool the intake manifold?
One of the princess auto extendable handheld mirrors is very handy for finding this problem. looks like this

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Old 12-16-2009, 12:49 AM   #4
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Location: Ottawa
Posts: 4,006
If it's by the firewall, I would put money on the hose that runs to the back of the head. or the actual gasket on the back connection to the head. Can't really see it well at quick glance.

Number 15.
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Old 12-16-2009, 09:49 AM   #5
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It's the hose that runs to the back of the head.
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