Temperature needle has a mind of its own!!
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Joined: Mar 2012
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From: South Texas
08 mercedes c350 p2
Temperature needle has a mind of its own!!
Hello everyone! thanks in advance for any help! I have a MB C350 and a few days ago my car started to act up! the temperature needle fluctuates it goes from 80 to 90! up down, up down none stop! after a while driving the temp goes up 90 to 100 up down...! the same way! at one point its even gotten as high as 115, while i was parked with the car on!! As soon as i started driving on the road the temp would go down to 90 and continue to fluctuate. when this is happening the a/c blows warm!! weird!! this only happens after a while of driving! i have no problems in the morning! the a/c is nice and cold! I checked the coolant level and it was abit low maybe an inch so i added water, but it made no difference!!! I have no idea whats going on!!?? 
Thanks again guys for the help!
Thanks again guys for the help!
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From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
Hello everyone! thanks in advance for any help! I have a MB C350 and a few days ago my car started to act up! the temperature needle fluctuates it goes from 80 to 90! up down, up down none stop! after a while driving the temp goes up 90 to 100 up down...! the same way! at one point its even gotten as high as 115, while i was parked with the car on!! As soon as i started driving on the road the temp would go down to 90 and continue to fluctuate. when this is happening the a/c blows warm!! weird!! this only happens after a while of driving! i have no problems in the morning! the a/c is nice and cold! I checked the coolant level and it was abit low maybe an inch so i added water, but it made no difference!!! I have no idea whats going on!!?? Thanks again guys for the help!
Thanks again guys for the help!
Thread Starter
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Joined: Mar 2012
Posts: 78
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From: South Texas
08 mercedes c350 p2
In the mornings the fans work, a/c works, everything works as it should, but the the needle starts jumpingup and down the fans don't turn on!?? Thanks RLE just wanted to see if anyone had this issue and if they new how much the dealer is going to over charge me... Lol
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Thread Starter
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Joined: Mar 2012
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From: South Texas
08 mercedes c350 p2
Dam I hope not! that sound really expensive!!! Hey to check the radiator coolant level do I have to take off all of the covers where the grill are?? beside the coolant level is there anything else i can check? How much should i more less expect to pay if i take it to the dealership?? And thanks "HotelCrazy"
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From: NYC
2012 C300 4Matic
Dam I hope not! that sound really expensive!!! Hey to check the radiator coolant level do I have to take off all of the covers where the grill are?? beside the coolant level is there anything else i can check? How much should i more less expect to pay if i take it to the dealership?? And thanks "HotelCrazy"
You say it was an inch low. Do you mean it was an inch below the very top or was the coolant right at the top of the clear portion of the reservoir (below the black plastic)? It is supposed to be at that level, not all the way up at the top. Just trying to figure out if it was actually low. Either way, if you never check your coolant it might simply have been that low for years and unrelated.
Here is a photo of what I mean (although your reservoir is probably a different shape) http://www.autopartswarehouse.com/im...pm161312_1.jpg
If you're afraid of the dealer take it to an independent mechanic who has experience with these cars. If it is just the sensor (most likely) it won't be too expensive unless you get ripped off (the dealer usually rips people off!)
Last edited by acr2001; Jul 24, 2012 at 12:05 AM.
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From: Toronto
2008 c300
Buried very deep somewhere I guess.
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From: Toronto
2008 c300
Thread Starter
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Joined: Mar 2012
Posts: 78
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From: South Texas
08 mercedes c350 p2
actually thinking about it, it was only under the black part maybe a 1/4 inch i added only a little bit of water almost nothing! I just bought this car maybe like 8 months ago and this is the first issue i've had! the guy before me took good care of it, so i think, because he had all the maintenance logged in from mercedes dealerships since he bought the car... Either way ill take it to the dealership in a few weeks, ill use my crappy car for now! 
I was hoping it was an easy fix, just changing out a sensor or whatnot! Thanks guys for your help
I was hoping it was an easy fix, just changing out a sensor or whatnot! Thanks guys for your help
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Joined: Feb 2004
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From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
Thread Starter
Member
Joined: Mar 2012
Posts: 78
Likes: 1
From: South Texas
08 mercedes c350 p2
So I called the dealership and i found out that the coolant temp sensor cost $8.00!!! with this news i decided to take in the car to swap the sensor but the labor was $178.00... i was thinking thats not that bad! but when i took it in the manager told me he was going to but the computer for free! just to make sure it was that sensor that was messed up! to my surprise it wasnt!!! it was actually the Coolant Fan!! the fan cost $535. and the labor is $225.00!!! FML!! the good part is that he atleast gave me a discount! im only going to pay $700. for everything!!! I guys im going to have to wait for the rims i wanted... oh well! id rather have my car running good than rolling on new rims!! thats guys for all the help!
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Joined: Feb 2004
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From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
