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Hi colb! Thank you for having a look at my post! I may not have explained clearly where exactly the leak happens. So I have attached a diagram I created when replacing the cooling system. It is part oem and part hand drawn but it helped me a lot during the overhaul. For sure if it was indeed as...

Hello Everyone! Wow a whole different world today when compared to a couple of months ago. Hope everyone is staying healthy. I have a leak at the joint of the upper plastic coolant line (11531705210) and the heater hose (64218377673). Both are new after a complete cooling system update and...

Hello Everyone and Happy Holidays!! I have a couple of quick questions about my 1999 Z3 2.3. On the passenger side seat belt, there is a little button to keep the buckle from sliding down too far. There is not one on the driver's side seatbelt. Can I put one in? Is there some reason the...

Hi Mario! Thanks for the information! What is the GAL? Something to do with speed and volume? Anyway, sure I would sell the amp to you! Where are you located? I have the amp out of the car - The 2 main plugs are still in the car and neither in great shape as I needed to see the pin numbers and...

Hello! I am bypassing the HK amplifier in my 99 Z3 2.3. I have been successful and am now using my new head unit to power the stock speakers which are all being replaced. The amp has 3 plugs - one of them is a 6 pin socket. Below are images of the amp and then a closer look at the 6 pin socket...

Just finished cooling system overhaul and manifold upgrade!

Hello! Having just finished a total cooling system overhaul and manifold upgrade, I realize I had neglected to address a small issue. The new expansion tank has a blue, 2 pin electric socket on the bottom. However, I cannot locate the associated plug for it anywhere in the engine bay. I am...

That would be great to know how to do that. Where can I find more information on the smoke test?

Thank you for the insights! I have added your changes and suggestions to the original posts. I appreciate your time! BTW, I finished the whole job today. Turned the key and it started right up - I was floored (and relieved)! The power change with the M54B25 manifold is noticeable and it is...

Continued from Part 1 (Vacuum and Electrical M54B25 on M52TU - Part 1)... Connection #10 Hard plastic pipe from center bottom of manifold to port on VANOS: Connection #11 Large vacuum hose from power brake unit to valve just right of throttle cable/body Connection #12 Pressure regulating...

Hello! I am finally ready to install the new intake manifold on my recently acquired 120K mile 1999 Z3 2.3 after a cooling system overhaul. Since the manifold needed to be removed in order to replace the plastic cooling pipes, I opted to upgrade to the M54B25 intake manifold for better...

Hello! I figured it out! The short answer is that it is the wrong tensioner. Despite the fact that ebay shows it as a "98-06 BMW 323 325 328 330 525 528 530 X5 Z3 M3 A/C Serpentine Belt Tensioner" and the realoem picture looks like the part, it is still wrong. The tensioner I ordered fit the...

Thanks for the link! That is helpful, especially the images. I will add that to my reference material. Thank you!!

Hello! Thanks for sending those images! And yes, gotta resolve this before putting radiator hoses, fan shroud, fan and new radiator in. It is nice to have the space right now though! I am going to give the belt stretch a try just to see how they behave - thanks for the recommendation. I have...

First, thank you for responding so quickly! I have been staring at it and the tensioner seems to be correct. I remember pulling the belt out, and thinking that with a tensioner like that one, it couldn't really be any easier. If I put a 16mm socket on the ratchet handle and then onto the stud on...

Hello! As I write this I have spent the better part of the afternoon putting back together the front of my M52TU motor, meaning pulleys, tensioners, idlers and belts. I thought I had put it all together properly but the belt appears too long to run as the diagrams and photos show. It is the same...

Hello Everyone! While overhauling the cooling system on my recently acquired 1999 Z3 M52TU w/120K miles, I broke the lower plastic cooling pipe that runs under the intake manifold. Even the gentlest pulling and rotating resulted in the end of the pipe stuck in the block with no way to grab it...

Hello Everyone! Given realoem's lack of a proper diagram for the Z3 M52TU cooling system, as well as my considerable ongoing confusion finding the right parts for my Z3 cooling system overhaul, I grabbed my Crayons, some realoem printouts and some ebay listings and created the diagram below. It...

Wow thanks to @the Nefyn cat , @t-tony and @Murray Wall! It cleared 100 degrees F today so I hid in the garage, poking around. I found a little piece of the original tubing at https://www.realoem.com/bmw/enUS/showparts?id=CN12-EUR-01-2002-Z3-BMW-Z3_22i&diagId=11_6220 on the pressure regulating...

My new to me 1999 Z3 2.3, M52TU has 120K miles on it and is in need of a complete cooling system overhaul. The process has been quite smooth - a California car is so much easier to work on than one exposed to harsher climates. I have so far removed radiator, shroud, belt tensioners, water pump...