Author Topic: cooling woes. new to the m42s (Read 3298 times)

srfjay · « **on:** October 12, 2008, 04:26:00 PM »

Ok new to the m42 but not to e30s. I have been looking on here for about 2 months and it has helped a lot.
Well i fixed tons of stuff on my car i did the mess under the intake clean up and it idles great. The heater was leaking so i replaced the core and it is good.
Then all new thermostat ,water pump , coolant flush . I did a compression check and it was good all across.
Well it over heats there is 2 things i thing it could be it . when it does it gos up slow has not hit the red yet but if i did not stop it it would. One thing is when i do the newspaper in the fan it will stop. Second is when i bleed it when i rev it bubbles keep coming out of the tank no matter how long i bleed it. But no coolant in the oil. Plus no hot heat out of the heater.
so could it be just the fan could that make it over heat if it is not strong enough? Or any other help please . i am just so fed up with this thing if i dont fix it soon i am going to just going to do a swap.
Thanks, jason

ak96ss · « **Reply #1 on:** October 12, 2008, 05:03:32 PM »

The fan clutch does need to be replaced if you can stop it with a rolled up newspaper, and you do not have a good bleed. Try elevating the front end slightly and make sure you have the interior fan on and heat set to high.

srfjay · « **Reply #2 on:** October 12, 2008, 06:57:51 PM »

well i am going to get a electric fan installed tomorrow then try it all over again hopefully that will fix it .

dark_islight · « **Reply #3 on:** October 13, 2008, 07:31:40 AM »

I had the same problem after I changed the engine. I replaced the clutch fan and bled the system.

Bleeding the system takes a couple of tries.

First run the car till it gets hot and open the bleed screw to release the air pay close attention to the temp guage, If it starts to rise past the half way point shut the car down at and let it cool off.
When it cools off the coolant will be pulled into the system. Check the expansion container to see if any coolant is required and top off the container.

You may have to do this a few times until the system stabilizes.

srfjay · « **Reply #4 on:** October 13, 2008, 06:25:50 PM »

ya i might have to try and bleed it again once i get my new fan in. Thanks for your help guys this cooling system is a pain in the ass. I have checked around and there is like 5 ways to bleed the system .Guess i just have to find the one that work best for my set up.

EN318isPDX · « **Reply #5 on:** October 13, 2008, 06:37:34 PM »

I have yet to find an easy way to bleed our coolant system. You gotta keep doing it until all the bubbles go away..

nicknikolovski · « **Reply #6 on:** October 14, 2008, 03:53:31 AM »

I have changed the coolant in my engine a few times for various reasons, and never had a problem bleeding it.

All I do is drain the coolant at the block drain plug, then at the radiator. Tighten everything back up, then turn the heater to the fully hot position and the fan speed at one. Then I start filling the cooling system with a mixture of 50/50. Can also be 30/70 or 40/60. I fill the cooling system until it reads to the COLD mark. Then I open the radiator bleeder screw slowly and listen as the air hisses out and I also watch the coolant level dropping. Once the hissing has stopped, I close the bleeder screw (DO NOT OVERTIGHTEN) and top up the coolant level back to COLD. Then with the radiator cap off, I start the car and rev the engine at 2,500-3000RPM. I watch the temp gauge rising slowly. Then once the temp gauge reads at operating temp, I allow the engine to idle for about 5-10mins more while watching the temp gauge. If everything looks OK, I put the radiator cap back on and go for a 15 min drive operating the engine through the rev range and at idle. Once again if everything is OK, I park the car and allow the engine to cool down. The next morning, I check the coolant level - it would have dropped slightly below COLD. If so, I just top it up to COLD with water. And thats it.

Ignore the Bentley manual procedure, it just confused the shit out me when it mentioned that bullshit about bleeding it until all the bubbles stop appearing in the coolant. Follow the above procedure, and you shouldn't go wrong.

deltaneo1 · « **Reply #7 on:** October 14, 2008, 04:45:51 AM »

try looking at the CAT one thats cloged will over heat... but think its your fan.... but if it over heats when your on the highway then its not the fan.....

Strongtrust · « **Reply #8 on:** December 07, 2008, 07:48:14 PM »

If a small steady stream of bubbles are coming up , it could be a pin holed headgasket.