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Old 06-05-2009, 06:09 PM   #1
spoony_prelude
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Overheating issue!

Ok guys, now before I start Please do not reply with a Take it to "shop name" As I have been to two shops, and the prob continues.

Ok, So long story short, right before my car went into the body shop, I broke the plastic clip that holds the throttle wire on the throttle body ( removed accelerator stop/carpets in order to repair car floor) So I went to euroguy, and he got me another throttle body. I put it in bled the cooling system, and everything was good. A few days later I go to start up the car, and all I got was a Cloud and a half of white smoke from the exhaust. The more I drove it, the less smoke came out, but everytime i would start the car cold, it would always smoke. Also the car's temperature would rise quite a bit.

After I got the car back from the bodyshop the smoke stopped, but the overheating coninuted. So I figured Prob the thermostat. Changed it. overheating stopped for a little while. So now that I've been driving the car more, I noticed, When I'm idling, the temp rises. As soon as I start driving the cars temp goes back to fine.

Long weekend for ex, sat night we went to niagra falls, No probs. Sunday night we cruised up to wasaga. Again, running perfectly.

One night car started overheating, pulled over let it cool down, then took it to a friend who works at a 24hour truck shop. He pulled the dip stick out, and we saw what looked like coolant. He used his laser temp reader. rad showed 170degrees F, Motor was showing 222F

Took it to known reputable shop. He said all he found was the electric fan was not coming on. Changed the Aux fan switch, and said it was fine and that I could now let the car idle for hours and the cars temp would not rise. I asked if it could be the head gasket, he said highly unlikly as the cars running well, no smoke from the exhaust. But also told me it could be on its way out. ok. Drove it home, np. Later on that night went out, same shit! back to over heating!

Took it to another reputable shop on monday. He said my Water pump bearing was starting to get tougher then normal, so changed the water pump, did a coolant flush, oil change. Found no coolant in the oil. Also found small pieces of rubber from my coolant resorvoir. but said car was ok. But, it continued to do it.

So 2 nights ago, I thought maybe the thermostat by some chance is ****ed. I took it out, bled the system. let the car idle for like 20-25mins. Fan would come on when needed. temp stayed perfect! so later on that night, drove up to my chicks house. No probs. Turned it off outside of her house because she was going to take a few mins. when i turned it on again, temp was at 3/4mark. It fluctuates from 3/4 to hot, stays at hot for like 10seconds, back to 3/4. and it just goes back anf fourth.

Please help
Jay
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Old 06-05-2009, 07:52 PM   #2
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Ever wondered if it's just the coolant temp sensor? I know the bentley manual suggests a few tests to test what the overheating problem could be (starting with a faulty signal/coolant gauge).
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Old 06-05-2009, 09:57 PM   #3
spoony_prelude
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Nah, when i took the car to my friends shop, he used his laser temp reader, and it showed 176 on the aux fan switch, and 220 on the thermostat housing itself.

Thanks for the thought though!

Jay
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Old 06-05-2009, 10:08 PM   #4
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have you had them check the flow rate of the coolant through the system? If it is being partially blocked somehow . . . maybe with those bit of pieces of rubber you mentioned it wouldn't cycle through efficiently

I'm not a mechanic and I'm out of my element here but just a thought
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Old 06-07-2009, 01:52 PM   #5
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eek...do you think this must have been because of the engine swap?
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Old 06-07-2009, 02:03 PM   #6
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double check and make sure you bled the system thoroughly. Put heat on full and open the cap and fill it till it over flows. rev the motor up for the motor to either force out the air or suck the coolant in. when all air is out completely you should get no bubbling at all.
Also check your fan clutch.

Sounds to me you still have a vapor lock.
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Old 06-07-2009, 02:11 PM   #7
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If you suspect a Headgasket, get a leakdown test done, that should definitely help you in determining if it is the headgasket is done.

I can't remember if you have an s52 or an M52 and I can't remember if the s52 is made from aluminum like the m52 but aluminum is much more sensitive to heat so it would be in your best interest to keep the driving to a minimum until you get that sorted out.

Good luck! and Hope everything works out for you.
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Old 06-07-2009, 02:29 PM   #8
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Quote:
Originally Posted by ceeker View Post
double check and make sure you bled the system thoroughly. Put heat on full and open the cap and fill it till it over flows. Rev the motor up for the motor to either force out the air or suck the coolant in. When all air is out completely you should get no bubbling at all.
Also check your fan clutch.

Sounds to me you still have a vapor lock.
+1.
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Old 06-07-2009, 04:25 PM   #9
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All the below is assuming the smoke from your exhaust is not black or blue bad white!
Did you check the condition of your oil and coolant? Is it possible you have a gasket problem? If oil is brown and kind of soapy then i am afraid its gasket.

Also make sure the thermostat opens and your fan is ok.Viscous couplings on BMWs are shit and very easy to see if they failed.
First however check as the others above mentioned if you are getting hot air when you switch on the heating.

Worst case scenario is a crack on either the block or head.



###EDIT###
Just noticed that you said your friend found cooland on the dipstic plus usually on BMWs when the gasket goes the temp gauge usually goes really high really quick when you started even if its cold. Hence I am afraid you need to take the head off. Most likely you have a gasket problem and dont use the car as you will warp the head.
I am 99% certain it is your gasket and i higly recommend you do not drive the car!!!!!!!!!!!
On a plus side you can do some flowing and lap the valves while doing this and you ll gain some performance!!!!!
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Old 06-07-2009, 05:16 PM   #10
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Quote:
Originally Posted by Ceeker View Post
double check and make sure you bled the system thoroughly. Put heat on full and open the cap and fill it till it over flows. rev the motor up for the motor to either force out the air or suck the coolant in. when all air is out completely you should get no bubbling at all.
Also check your fan clutch.

Sounds to me you still have a vapor lock.
You Win! Thanks for all the help guys!

Well after I posted this I was talking to Racing_Trends, and he suggested maybe the cooling system wasnt properly bled. So I checked google, and a thread to bimmerforums came up made by a BMW tech.

Said to lift front of car so that the coolant reservoir was higher then the engine, fill reservoir, run engine, when engine gets to normal temp, rev to 2500rpm for a min, top up coolant, repeat. I could see the bubbles come out, and see when the coolant dropped (thermostat opens). I continued to top up. So far drove it quite a bit friday night, sat night. And so far engine temp has been perfect!!!

Thank you everyone for your help and suggestions!

Jay
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Old 06-08-2009, 04:52 AM   #11
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Quote:
Originally Posted by spoony_prelude View Post
You Win! Thanks for all the help guys!

Well after I posted this I was talking to Racing_Trends, and he suggested maybe the cooling system wasnt properly bled. So I checked google, and a thread to bimmerforums came up made by a BMW tech.

Said to lift front of car so that the coolant reservoir was higher then the engine, fill reservoir, run engine, when engine gets to normal temp, rev to 2500rpm for a min, top up coolant, repeat. I could see the bubbles come out, and see when the coolant dropped (thermostat opens). I continued to top up. So far drove it quite a bit friday night, sat night. And so far engine temp has been perfect!!!

Thank you everyone for your help and suggestions!

Jay
Its good that you fixed it but i think there must be some gasket issue. Otherwise i dont see how you would get water in your oil.
In any case fingers crossed it will be ok! If it shows up again though i really think its your gasket!!!!
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Old 06-08-2009, 06:41 PM   #12
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^^^ Yeah it's wierd. I had the second shop I went to change the oil. And they said they didnt find any coolant in there. Which left me thinking wtf, I could have sworn I saw coolant in there!?!? Fingers are defenatly crossed!

Thanks for the tips guys!
Jay
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Old 06-09-2009, 05:02 AM   #13
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Just to be sure why dont you do a compresion test to see if you do have any leaks inside the bore. Make sure you keep your radiator open so if there is any it will show up as bubbles there!
On the other hand if its running fine now why bother?
I am just concern that if it is the gasket or head the damage will get worst.
I ma sory if i am being pushy or giving you the wrong vibe. Its just that i ve been there and it cost me a head a few years ago !
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