I have a Mercedes ml 270 cdi W163 2002 UK model,
I recently noticed that on my dashboard cluster display the water coolant temperature dial is not registering anything but noticed that the internal car temperature was getting hot and when i lifted the bonnet i discovered that my coolant tank almost was empty, so after letting the vehicle cool down i re- topped it with water, i am now keeping an eye on the coolant tank, because the coolant /engine temperature is not registering on the dash......is there a fuse blown ????.......or is it something else ?

Do you have one large cooling fan like this?

Do you have a square type fuse attached to the POSITIVE cable?

Hi yes i have the square bit on my battery and the fan is similar (big) like the one in the diagram

The Square Bit

Battery positive terminal

The big fan

I forgot to ask, does your fan come on when you select A/C?

Hi
I have never used my AC .....
I have let the engine run for a good ten minutes, then i have tried the AC dials in the attachments but no joy there....
I had the engine running for a further 20 minutes, at no times did the fan kick in
The square block (fuse) on the battery is OK

climate control panel

I pressed this button first (red light)...fan did not come ON

I pressed this button second (red light)...fan still did not come ON

do you know what this button is for in the attachment ???

what is the little black button for (see red arrow)

You will have to look in your owner's manual.

As far as the "little black button" highlighted by an arrow in red, I fully understand you referring me to "the owners manual", but unfortunately i was not given an owners manual when i purchased the car etc....the only reason i added this item in the thread was that on your advise I tried to turn the AC on and observed the radiator fan did NOT come on, and as i am not familiar with the AC, i then tried the various methods with other dials and functions to see if the FAN would come ON, and even tried the little highlighted button but to no effect....without even knowing the function of that button in question.
However the little button is not the main problem of my original THREAD....I have submitted the information that you requested with attachments regarding:-

• The FAN
• The SQUARE block (fuse) on the battery
• ...and if the FAN came ON when the AC was activated

So on these 3 points, I am now assuming that you will provide me with your expert advise as to why the water/engine temperature gauge on the dash, is NOT registering anything at all ?????

Start the eng. and turn the dials to to the arrows. Open the hood and see if the fan is running.

Hi
thanks i will try tomorrow and let you know

And now buy your own manual.

https://www.ebay.com/itm/29397504397...oAAOSwOqtgEBnE

hi
thanks for the link
Today I started my vehicle up, and warmed the engine up for about 10+ minutes
I then as you instructed turned the FAN to full (5), and the Temperature to maximum cold (16), and the third dial to the left (which i assume is the AC) as being shown in your attachment etc
.....but the radiator Fan still did NOT come ON ?

Do you have a scanner?

Why did you warm up the eng. for 10 mins?

Hi
i was told by someone that the fan does not kick in until the engine has warmed up ???
However i did what you told me to do initially without warming the engine up and the fan did not come on then either

i was told by someone that the fan does not kick in until the engine has warmed up ??? Yes that is true but when A/C is selected, It comes on immediately.

It's time to read codes in the AAC Module. Scanner is necessary.

hi
does it have to be done on star scanner or will it be ok to use the iCarsoft 2nd Generation scanner for these (AC Module) codes /
For some reason the iCarsoft scanner does not cover all the scanning modes particularly on the Mercedes Benz ML Class 270cdi models, specifically the early or around the years 2000 etc

Star would be perfect but if you have a cheap code reader, that will not do the trick.

I know nothing about your iCarsoft 2nd Generation. If it cannot read codes in the AAC it is useless. Get the right one.

ok
thanks

hi
i went to the mechanic for a scanner reading of my vehicle
the mechanic said that without going into the scanner reading situation, he can tell that my engine has a serious AIR LOCK !!!!!
i might as well tell you the procedure, whilst parked outside his workshop, he instructed me to warm the engine up on high revs and that he will return to me in about 10 to 15 mins
after 10 mins he returned and turned off the engine and slowly cautiously opened and removed the water/coolant filler cap and asked me to re-start the engine and repeat the procedure on high revs for another 10 to 15 mins.....again he came back after 15 mins and turned the engine off and replaced the filler and restarted the engine and let it run for another 15 mins.....during this time I noticed the radiator fan came ON and my temperature gauge was now also WORKING (however the temperature gauge now reads 50 degrees , whereas before it used to read 85 degrees ?)
the reason I have gone to a great length in describing the above procedure is so as that maybe some member on this forum may find this information helpful
the mechanic did not charge me anything for this fix (probably because i did all the work ! )
Anyhow all done and dusted thanks to everyone
Regards

Thanks for that tip, I was having the same issues as my car, was stood for 8 weeks and flat battery. I jumped started it and then after a day or so the light came on. I cleaned the battery terminals ( youtube video) and even called the AA who scanned the car and found P1636. Checked again on YouTube and people fan's were being replaced but issue remained. I will give this bleed ago as 500 miles previously I did a swirl flap delete that involved removing the thermostat. Problem only occurs when the ac is turned on but I also noticed that the heated seats just blink and don't turn on ( any suggestions). Thanks again for everyone's help.