My car has been running hot on days where I am pushing it or if I am sitting at idle, like in heavy traffic. I followed the instructions in a previous post to see whether or not the aux fan motor would engage. Using the AUTO buttons, holding down for >10 seconds, the fans both spin freely. However, holding the REST button for 5 seconds, then dialing the left side to 20, the reading doesnt match up with what I have read it should be. Instead of 10, it reads 21.1. I am stumped, looking for anyone with an idea on what I should do to remedy this.
Last edited by Black&TanW210 : 08-24-2008 at 08:36 PM.
Reason: No response
WTF people. I have seen more posts about whether or not someone should put gold trim on a car and whether it would look alright with the chrome. Every time I have put a post up asking for assistance, I havent gotten a single response.
WTF people. I have seen more posts about whether or not someone should put gold trim on a car and whether it would look alright with the chrome. Every time I have put a post up asking for assistance, I havent gotten a single response.
I think that is because there are fewer people here who are familiar with the Diesel cars so you have less of a knowledge base. I have no idea what normal operating temperature is on that car. I don't know what temperature your thermostat begins to open and I don't know what temperature it is fully open at. I don't know if you have a mechanical fan with a fan clutch plus electric fans like I have on my M104 or if you just have electric fans like I have on my M112. Having said that, let's get some more information.
Your temperature goes up when you are at idle in heavy traffic. Does it go back down as soon as you start moving again or does it stay elevated?
Does this just happen on particularly hot days or with the air conditioning on? Or will your temperature go up under all circumstances?
Have you had any work done on the car lately that would have involved removing the electric fans?
I'll look back later today to see if you've answered, and we can go from there. I'm not a cooling system specialist, but I've worked through cooling system issues on my W202, so I've got an idea of some of the cause and effect.
Serious work involving the removal of the fans. I am not sure if there is a fan clutch. I dont run the air conditioning. The temp does go back down, but not right away.
The car usually runs at 80C or less. The temp use to take a while to get up to temperature, now it seems to take almost no time at all. I did change the coolant recently, and neglected to change the tstat.
Thanks for the reply. We'll get it right eventually.
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I never meant to offend anyone, and I was certainly not bashing the advice that was offered.
The only reason I have an attitude on this matter was because I am fairly certain that a user has the answer I am looking for, and I pmed him, and he told me to post a thread. As you can see, he has yet to actually offer any assistance whatsoever.
As I said in my original post, any suggestion would be appreciated. I'll work on my attitude.
I did change the coolant recently, and neglected to change the tstat.
Did you start to have your problems shortly after changing your coolant? Did you just replace the coolant or did you use any sort of flushing chemicals? Has the coolant been changed at regular intervals or has it been a long time?
Quote:
Originally Posted by Black&TanW210
. The temp does go back down, but not right away.
Quote:
Originally Posted by Black&TanW210
The temp use to take a while to get up to temperature, now it seems to take almost no time at all.
These two things suggest to me that your cooling system has some sort of a blockage in it that is reducing the flow of coolant, which makes the car run hot. It could be as simple as the thermostat being stuck in the partially open position, which doesn't allow for proper coolant flow when you reach operating temperature. Or you could have some sort of blockage in your radiator - some build-up could have been jarred loose by the coolant replacement and is preventing full flow through one of the galleries in the radiator.
If you have the ability to change your thermostat yourself, that is probably where I would start. That should run you about $10 and a half hour of your time, so it is a cheap and easy diagnostic method. If that doesn't correct your problem then I would start investigating the radiator more closely, perhaps with an IR thermostat to see if there are abnormal hot zones.
Changing the tstat will be a start. I didnt use any chemicals to flush, but I did flush with distilled water.
After changing the coolant, it ran nice and cool for a good couple weeks, maybe even a month. I have only owned the car for about 8 months now, so I am unsure about the maintenance.
It has about 108k on it now.
I have a bottle of Zerex flush solution, anyone think that is a bad idea? I bought it but never used it when I changed the coolant.
I would appreciate any response. You W210 owners are a fine bunch of rabble rousers.
While I am unable to tell whether the fan is working when the car is running, I know that the fan does work.
When using the pushbutton climate control, if you hold down the auto buttons for more than ten seconds, the fan fires up at full speed.
However, if anyone knows how to diagnose the readings when the REST button is held, when you set the left to 20, the right number reads 21.1.
I am beginning to think that it could be a combination of things, but as I said; I have only owned the car for 8 months, so I have never been through this before.
Im thinking thermostat, aux fan control module, maybe even the water pump.
It does run cool when it isnt pushed, but I think there is something going on that is not quite right. I'll start with the thermostat.
Anyone have a suggestion on where to get a tstat. I know you gasser guys can get them anywhere but I have been told I need a new housing for mine.
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