smint007

Hey!
I recently bought a 1999 w220 s320 gas, 224hp.
Im going to change water pump, serpentine belt, tensioner, thermostat.
So my question is this...

1#
With the waterpump, will all waterpumps made from 2000-2004? fit in my engine? Does it matter if its RWD or LWD. And is it noe\t the same parts for this on the LWB and SWB?

2# Same for tensioner, will tensioner produced from 2000-x? be the same part as in 1999?

I find it hard to get more info from 1999 w220 than the 2000, I dont get why that is tho. when I search by
https://www.autohausaz.com
https://www.parts.com
I can choose 1999 but not the w220 chassie, and when I go by 2000 I get the chassie, but mine is produced in 1999.. -.-

engindin

your engine is m112,
water pump is same as 2000+, go for saleri, I changed last year, it was 90$
I will recommend you to get oem serpentine belt, it is not much price difference, it should be oem for me.
get meyle tensioner, it is same as 2000+
Why to change thermostat? Is it for preventive maintenance? thermostats for M112 are not problematic I think.


I can give my part numbers if you want to compare.

smint007

Thanks for your quick answer!
I figured why not change that aswell when I already take off the parts, but for maintenance I will keep that up. I would really like to have your part numbers if its not to much hassel

tusabes

Unless you're having a problem with your water pump you should not change anything except the belt , and only if the belt is worn

Too often we see people encounter problems changing things that are working fine and should be left alone

mercy-me

Totally agree.

If the motor is not overheating then why change out the water pump and thermostat?? I would only change the belt and belt tensioner as these are known wear failure items and in my opinion, should be included in the normal maintenance schedules A,B,C. I had a bad experience with a failed belt tensioner which could have been a disaster had I been a long way from home.
See my post here.

Good Luck,

Bob

smint007

The main reason why I want to change the thermostat is because sometimes it works just fine, other times it starts on cold engine at 80C and keeps on going to 120C and then when I switch on/off engine it goes down to 80C and sometimes it starts at 90C its just living its on life on there, and some times its normal, maybe bad connection? Its not a major problem, since the motor is not running hot.

tusabes

Sounds more like. Coolant temperature sensor failure

smint007

The reason im gonna change water pump is because it makes some "metalic" sounds when the engine is running, either water pump or some of the other wheels that spins there.

smint007

Yea I'll change that one aswell

For the termostate I guess thats what controls the "warm air" going into the cupe? witch goes open and closes if it gets to hot or something? Becuase I went to the dealer and got a price estimate, and they would change this, is this some of their regular routine?

engindin

Please make sure that your vın starts wıth 220165 and your engıne ıs 112.944

Waterpump : A1122001401
Tensioner : A1122000970

wallyp

I suggest that you do some more checking before you start throwing expensive parts at the car - that will get real expensive real quickly.

First - While it is possible that the noise is your water pump, there are pulleys on the belt that fail much more often than does the water pump, and they are much cheaper. In the USA, the auto parts stores sell "mechanic's stethoscopes", which is a stethoscope with a long slender metal rod to pick up noise and vibration. You can (very carefully) touch the rod to the non-moving center of each of the idler and tensioner pulleys and immediately tell if one is failing. You can also touch the body of the water pump and tell if that is the source of the noise.

Second - There is no way that the actual temperature of the coolant can change in seconds. If the temp reading is changing instantly, that is the gauge system, not the thermostat. Any change due to the thermostat will take minutes, not seconds. As has been suggested, the problem is more likely to be the temp sending unit installed in the motor.

The thermostat is a temperature-sensitive valve installed in the engine to regulate the coolant temperature. They are usually made to hold the coolant temps somewhere near 95c. The valve is closed when the coolant is much below that, slowly starts opening as the temp gets close to that, and closes slightly if the temp goes below that.

smint007

That is correct!
I got this tensioner http://www.ebay.com/itm/391394702464?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

and waterpump: http://www.ebay.com/itm/151028594850?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Both the manufactor you told me to I think these part will fit just fine! and OEM belt ofc

engindin

please check mercy-me and wallyp posts, they are very experienced and valuable members.


For me, my water pump was noisy and I changed tensioner together with idler for maintenance. Probably this may not solve your problem.


I go oem for idler aswell, cheap part but can lead disaster if it fails.

smint007

Thanks for all the advices!! much appreciated, I will get a stetoschope asap to clarify which of the wheels(pulleys) who makes the rumbling sound in the engine before I change the waterpump. Very good forum, got a lot of information here!!!
I was gonna change the cabin filter, and also check in the engine, I see a lot of water in the AC intake, and seached it up. As I read I see there is a common problem that the drain in the black box got sealed by a lot of ****, so I just rubbled my hand in there and spash a lot of water just went out under the car. From now on I'll check there once a month, because I saw people getting problem that the water went inside the car and made humid and other electrical damages. Easy fix Thanks again guys, ill come ask for more help if needed!!