Cooling Kit recommendations-M44

**RedZeddy** · 05-05-2016, 11:20 AM

Hey guys,
Im looking at replacing my thermostat and hoses since im having a hard time reaching normal operating temp on a frequent basis. My car has 136k miles and more than likely are original parts.

Im exploring the idea of taking it a step further and replacing the coolant system by also doing the water pump and radiator. I came across this kit handy from bimmerzone:
http://www.bimmerzone.com/BMW_Parts_...3-COOLING.html but its only for the 2.8 models.

So here are my questions:
1. Is there a similar kit for the 1.9l engines (other than adding part by part) to save some money and if so, what has been your experience? Where did you get it from?
2. This issue has prob been beat to death, but composite vs metal impeller for WP? The stewart water pump I saw, again, is only for 6 cyl models. Is the GRAF pump the 4 cyl equivalent?

**Vintage42** · 05-05-2016, 05:39 PM

I have not seen a kit for the 1.9. I bought most of my parts individually based on this DIY:
http://www.318ti.org/forum/showthread.php?t=18066

Edit: I see that ECSTuning has 1.9 kits. Put in the water pump number 11510393338 to see them all. The remanufactured OE pump would be a Saleri.
Here's their OE kit:
https://www.ecstuning.com/BMW-Z3-1.9....9L/ES2718390/

The original pump's impeller is composite, and the current OE replacement pump by Saleri also uses a composite impeller. I was told that composite is the best choice, strong and light, and it's what I used - the remanufactured Saleri.
Saleri composite pump.JPG
The GEBA pump uses a cast metal impeller, however I have read that the weight is hard on the bearing and seal.

HEPU cast steel impeller.jpg
The HEPU pump also uses a cast steel impeller.

GEBA water pump 1.jpg
The Graf pump uses a spot welded sheet metal impeller.
https://www.youtube.com/watch?v=eeFUhg8PmDk
However, it can come apart.
Graf_waterpump_installed_in_May_2010.jpg