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DIY: Do It Yourself
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Old 11-02-2013, 01:33 PM   #1
2001bimmer330i
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330i overheating issues

I have read a lot of threads on overheating and I still need to post a question. I have a 2001 300i, and it overheated a few weeks ago. I went ahead and bought a pump and a thermostat. When I pulled the pump I didn't see any prolems with it so just reinstalled it. I figured I would just keep the new one for when it's needed. I then replaced the thermostat. Added cooland and bled the system then no problems for a couple of weeks. My son was driving it and within 15 minutes or so it overheated. The lower radiator hose was popped off, I assume due to the pressure. I had the car towed home and put everything back together to troubleshoot. I did noticed that the lower hose stays cold, and with the heater wide open there is no hot air. Sounds like thermostat but I just replaced it. Any other ideas? Maybe go ahead and replace the pump anyway? By the way, in the neck of the radiator opening where the cap goes I do see a stream of water at the top indicating that water is circulating.
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Old 11-04-2013, 08:04 AM   #2
2001bimmer330i
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Bump....any ideas guys? Just wondering what else to check. I think the only thing left is an air bubble. Is the only way to get rid of air, through the screw at the top of the radiator?
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Old 11-04-2013, 05:02 PM   #3
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One possibility could be the radiator cap. There is a one-way valve in there that should release pressure if it gets too high. Perhaps replacing that will help. Granted, it may prevent your hoses from blowing off but that doesn't solve the problem of why the engine is getting too hot, it just prevents pressure from getting too high. Is there a big difference in temperature between both radiator hoses?

Edit: Sorry, I just re-read and see that you already stated the lower hose stays cold. It should be cooler than the inlet, but not cold. Are you thinking there is no water going through the radiator? It sure does sound like the pump or T-stat when you say you get no hot water inside the cabin either.

Last edited by kd7iwp; 11-04-2013 at 05:04 PM.
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Old 11-06-2013, 01:12 PM   #4
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Yep, that's what is weird. I replaced the thermostat. I pulled the pump and it rotates freely, doesn't have any breaks or cracks. Nothing leaks. What is the possibility that there could be an air bubble? All I know to do is back off the pressure screw...let the car warm up until water comes out then tighten it back down. Is there something else that can be done to be sure there is no air?
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Old 11-08-2013, 05:29 PM   #5
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didn't read one word of your post.

replace the entire system. see the first link of my sig
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Old 11-08-2013, 05:33 PM   #6
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Re: 330i overheating issues

Sounds like your tstat was bad out of the box. What brand?

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Old 11-08-2013, 08:09 PM   #7
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The hose popped off because the clip wasn't probably on correctly.
Is your car auto, or stick? Maybe the fan(s) aren't working?
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