View Full Version : e30 M20 over heating

08-05-2009, 04:53 PM
I was topping up my rad now for about 2 weeks because I had a small drip from the rad plug. Temp stayed stable between 1/3-1/2. Now it started climbing gradually into the 3/4 mark and I smell coolant. Coolant level was a little low so I topped it up. Flow is going through the stat. I thought maybe vapor lock. So I opened the purge valve and coolant was flowing. Reved the motor to get the circulation up just to add more coolant since I figured I could force some in due to the loss. Still the temp climbs. Fan seems to spin normal - can stop it with my hands so I was suspecting maybe the clutch is pooched?
Don't think the thermostat is bad. Waterpump going? was changed about 20k ago.

Any suggestions?


08-05-2009, 05:19 PM
I find when there is a leak, the cooling system will do odd things because it is not able to build up any pressure in the system.

Fix the rad leak, do a full bleeding and go from there.

08-05-2009, 06:22 PM
Believe me the pressure is for sure there. it just all of a sudden showed up - been driving like this for over a month. I'll do the plug when I get back in. Lucky for me I have a 2nd car..phew.


08-05-2009, 07:40 PM
You say you can stop the fan with your hand? New fan clutch for sure.

08-05-2009, 10:58 PM
i thoght u worked at bmw???

08-05-2009, 11:02 PM
He did work there past tense

08-05-2009, 11:08 PM
yeah, I got fired because I was giving the wrong parts to the technicians. I couldn't figure out why they were complaining when I gave them e30 parts for e46's...lol.

08-06-2009, 10:25 AM
uh, that pretty much removes your ability to use "i worked for BMW" in any internet argument, fyi :D

yeah, fix both, both will contribute to the problem

08-06-2009, 10:27 AM
where is the sense of humor in this place....sheeesh...(Grin)

08-06-2009, 10:29 AM

08-06-2009, 10:54 AM
There were some people doing bad things in my dept. and I was suspected of knowing about them. Although I didn't, those people found me a threat and found a way to get me fired with no just cause. Shortly there after, "they" were charged with theft and embezzlement and dismissed - I was the thorn they needed gone. :-)

08-06-2009, 11:31 AM
Wow, that sucks.

08-06-2009, 04:15 PM
well, I was bummed out for a while and was offered a job from another dealership; but I decided summer was a good time for a vacation and what thought to be 3 months off ended up a couple years..lol. been asked indirectly if I wanted to work for them time to time but never took it up. They got what they deserved. :-)

08-06-2009, 04:37 PM
fan clutch.

08-08-2009, 09:47 AM
My car had a similar issue. I tried to stop the fan using some paper (too scared to put my hand near that thing when it's running), it didn't even slow it down. So my vote is also for the fan clutch, a friend was able to stop his with his hand and that's exactly what it was...

If you want to check the thermostat anyway,(that was my problem)...I wound up taking it out in a gas station, putting the o ring back in, and then drove the car home. The engine ran cold the whole time, so I was pretty sure I found the problem. A further check is to take the old thermostat out and put it in boiling water to see if it opens up. At least this won't cost you anything to check, just a little time. A new thermostat is about $40 at part source.

But my vote is still for the fan clutch.

Good luck!