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BMW645 Germany 02-05-2012 05:53 PM

Belt Drive Belt tensioner Climate Compressor missing
1 Attachment(s)

I want to change all the belt of my car because of 72000 milage and preventive maintenance.
By this way I found out that the belt tensioner for the climate compressor is missing.
It is a second hand car and I don't know what the pre owner did. When I look at the mounting point for the tensioner, then it look like that there was never a bolt in.
I dont know how they got the belt on.
Attachment 311180
So it look like that I have to buy the tensioner, :tsk:

Yorgi 02-05-2012 09:26 PM

I am pretty sure there is no tensioner on the A/C compressor belt.

This thread has a .PDF with the instructions for both belts.

BMW645 Germany 02-06-2012 06:52 AM

Thanks for the link, when I look to the second pdf down the last picture I can see the belt tensioner, maybe for the model later they installed it.

Yorgi 02-08-2012 09:25 PM


Originally Posted by BMW645 Germany (Post 6612887)
Thanks for the link, when I look to the second pdf down the last picture I can see the belt tensioner, maybe for the model later they installed it.

I think BMW re-uses pictures from different cars in the TIS. The first and second PDF look like completely different motors. Maybe send brown370 a PM since it looks like he has changed these belts a few times.

brown370 02-16-2012 02:00 AM

The V-Belts has a tensioner and the A/C Compressor does not. You have to pull the belt off with a rag while turning the crank. You have to use a special tool to stretch the new belt on.

brown370 02-16-2012 02:16 AM

3 Attachment(s)
You will need a sepentine belt tool w/ a large Torx socket T-55. To remove the sepentine belt first (lest than 10 minutes) Take a picture of the belt before removing it so you know how it goes back on.
Jack up the car and remove the front underbody cover. You use a towel to remove the A/C compressor belt while turning the crank/engine. One you remove the old A/C belt, put the new belt over the crank first, and then install it on the bottom of the A/C compressor and install the tool pictured on the A/C compressor pulley. Turn the crank clockwise keeping the belt tight and the tool will pop the belt on. I had to do it twice because the belt ribs did not line up the first time.

BMW645 Germany 02-16-2012 12:31 PM

Thanks for the help, I postpone it in the moment. After changin of the O-Ring for the temp-sensor and changing of transmission oil, I need a rest. :-) Will do that then later, but it i slik u wrote.

abercrombie1958 05-11-2012 07:14 PM

no tensioner 06?
my 06 650 is missing the a/c belt and tensioner,along with part of the upper oil pan,did the 06 have a tensioner?

daf290 08-17-2012 07:20 PM

AC belt install tool
I am fighting installation of the AC belt. I made a tool to hold the belt and turn the crank over similar to the tool shown in the prior post. Even with my home made tool I am having difficulty.
I need to break down and buy the proper BMW tool to install the AC belt. I cannot find the part number for the AC belt installation tool.
Does anyone know the part number for this tool or where to find it?

daf290 08-17-2012 07:31 PM

Found Part number
Sorry, I found the part number of 64 1 040 but I cannot see any of the online suppliers that list this part number. I guess I may need to try to special order.

mr bm ac6 10-17-2012 12:52 AM

climate tensioner
i had the same problem bro my climate belt cut while driveing i took it to a random independent shop to replace the belt the mechanic told me my tenssioner is misssing but i took it to bmw technition he told me that this cars dont have tenssioner but not any mechanic can replace it the mechanic needs to have this special tool to install the belt so so if i were you ide take it to a bmw specialist shop

mr bm ac6 10-17-2012 12:55 AM

does anyone know why my dynamick drive malfunction light is on and how can i fix this problem

hugo_za 09-03-2013 05:33 AM

Hey guys. I know this is an old thread, but I thought I would add a little update. The belts used by BMW are manufactured by ContiTech so you can replace them with either BMW branded belts or the Continental ContiTech ones.

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