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Temp gauge reads 60

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mdcarroll's picture
Auburn, NY
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1987 560SEL

My 86 560SEL reads 60 at most when warm. I thought it might need a thermostat so I replaced it along with a 50/50 mix of coolant. For the first 10-15 min the heater blew cold where in the past it was hot almost immediately. Then after all that the temp gauge still didn't reach past 60 degrees.

What is my next step?

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bsmuwk's picture
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Re: Temp gauge reads 60

I would expect the 60 range to be entirely acceptable on these cars? My old 420 sat around 60 no matter what the temperature outside was.
Is your heat hot when the car warms up?

What seems to be the problem? Do you want to run your car hotter?

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mdcarroll's picture
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Re: Temp gauge reads 60

I guess I thought 80 was more of where it should be (not for any particular reason). The heat was hot upon start up before I changed the thermostat. After the change it took about 15 mnutes to for the heat to warm up.

No particular problem I guess, I just thought it should run hotter.

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Sokoloff's picture
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Re: Temp gauge reads 60

60° is way too cold - you need to get it to run around 80°. How did the old coolant look when it came out? Did you clean the cooling system?

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wczagor's picture
Roswell, GA
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1987 420SEL
Re: Temp gauge reads 60

My 91 560 SEL reads 80 most of the time. However there is a chance that your problem could be something called a monovalve. Its what I replaced when I had a similar problem. I did it myself and it only took a few minutes.

Is the heat coming out of the correct vents or is it moving around? Mine was just coming out of the defroster vents at the base of the windshield. The thermostat might also be the problem if the temp is taking too long to get up to 80. Did you search the archives, try that too. As a newbie my advice is far from expert, but thats my two cents anyway. The monovalve should be pretty inexpensive, unless you buy one from the local Benz Dealer. Over a hundred dollars! Yikes. I think I paid twenty bucks.

Keep us informed.
Good luck.

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Re: Temp gauge reads 60

60 IS way too cold.
Verify the accuracy of the temp sender & gauge first
The new t'stat could be stuck open

Try a piece of cardboard in fromt of the radiator, see if you can't get it up to 80 as a test. If that does it, then somehow water is getting to the radiator before it gets really hot.

The monovalve, even if stuck wide open, couldn't account for 60C

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Jim Hansz's picture
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Re: Temp gauge reads 60

New sending units are only about $15-$20 and easy to replace. Considering the age of your car I'd replace the sender, especially since you have already addressed the thermostat and coolant.

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wbain's picture
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Re: Temp gauge reads 60

Before you replace the sender, unscrew it slightly and then tighten it. There may be some corrosion causing a bad ground.

The engine should be from 80 to 87 degrees. You're lucky it's not too hot.

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Benson's picture
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Cold air blows out of my heater all the time

I have 2 questions for my 1985 300 SDL
1. MY HEATER NEVER BLOWS COLD AIR? WHAT IS THE PROBLEM?
2. THE TEMPERATURE GUAGE IN THE DASH READS IN CENTIGRADE. CAN I CHANGE IT TO FAHRENHEIT?

THANKS,

BENSON

PS, I BOUGHT SOME VINYLEX BY LEXOL... WORKS GREAT!
:drive:

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Re: Cold air blows out of my heater all the time

Benson;192449 wrote:
1. MY HEATER NEVER BLOWS COLD AIR? WHAT IS THE PROBLEM?
2. THE TEMPERATURE GUAGE IN THE DASH READS IN CENTIGRADE. CAN I CHANGE IT TO FAHRENHEIT?

1. Not to be a smart guy, but it IS a heater, it's supposed to blow hot air. Search "monovalve" for some other ideas.
2. No

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Re: NO HEAT?

Originally Posted by Benson
1. MY HEATER NEVER BLOWS COLD AIR? WHAT IS THE PROBLEM?
2. THE TEMPERATURE GUAGE IN THE DASH READS IN CENTIGRADE. CAN I CHANGE IT TO FAHRENHEIT?

I MEANT TO SAY MY HEATER NEVER BLOWS WARM AIR.

Benson
:drive:

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raymo's picture
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Re: Temp gauge reads 60

I would check to see if the new stat was installed in the correct direction. Just maybe the brass sensor is facing the radiator side instead of the engine? It could be flipped 180 degrees?

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MB_Mike's picture
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WOW! Thanks for all the replies

Sorry I haven't checked this post in awhile.

@Sokoloff - The coolant came out looking normal and I did not clean out the system, just ran water through it then added the 50/50 mix.

@Jim Hansz - I have ordered a new sender but haven't installed it yet. (I know bad MB owner :nono:)

Still driving around at 60 but the car seems fine. So I will update when I finally get my act together.

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mdcarroll's picture
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1987 560SEL
Re: Temp gauge reads 60

Who takes longer to remedy a problem? :grin: I finally got around to changing the temp sender this weekend and VOILA! So it took all of 30 seconds to replace. I would suggest for the $10 or $12 that it cost, unless you need a coolant flush as I did, start with the temp sender.

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