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  #1  
Old 01-21-2007, 08:37 PM
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Join Date: Dec 2000
Location: Mountain Island Lake, Charlotte NC
Posts: 376
Cool running 91 300te, what is normal temp?

What is the normal operating temp on this car? It seems as it is low on my car. Just over 60c usually. Also, my heat doesn't seem to be as hot as it should be. I can open it up to full heat and it warms but never gets HOT. Any help is appreciated.
rob

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Rob Armstrong, Charlotte, NC
Mountain Island Lake
RobAinCLTNC@hotmail.com

2004 VW Passat GLS TDI-50k
2006 Honda Odyssey EX-L 7k
FOR SALE 1991 300TE 228k

2003 Subaru Outback 57k Silver/Black-SOLD
2005 C230K 18k Pewter/Grey-SOLD
1997 E420 108k Black/Grey-SOLD
1986 560sl 200k Black/Palimino-SOLD
1985 300sd 340k-SOLD
1979 240d 170k-SOLD
2000 Volvo V70XC-POS couldn't sell fast enough
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  #2  
Old 01-21-2007, 11:46 PM
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Location: Los Angeles
Posts: 963
My 1991 300CE runs at 85-90C, a little warmer now with a new thermostat. Prior to this it seemed to run too cool, barely 80C. Then the thermostat failed in the closed position and I overheated and this subsequently led, I believe, to a failed head gasket.

A thermostat is cheap and easy to change.

glenmore
1991 300CE
2000 C280
1990 LS400
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  #3  
Old 01-22-2007, 07:12 AM
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Location: Mountain Island Lake, Charlotte NC
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Quote:
Originally Posted by glenmore View Post
My 1991 300CE runs at 85-90C, a little warmer now with a new thermostat. Prior to this it seemed to run too cool, barely 80C. Then the thermostat failed in the closed position and I overheated and this subsequently led, I believe, to a failed head gasket.

A thermostat is cheap and easy to change.

glenmore
1991 300CE
2000 C280
1990 LS400

Understood. I'll pick one up today. Can anyone give me instructions for a novice dyi'er?
__________________
Rob Armstrong, Charlotte, NC
Mountain Island Lake
RobAinCLTNC@hotmail.com

2004 VW Passat GLS TDI-50k
2006 Honda Odyssey EX-L 7k
FOR SALE 1991 300TE 228k

2003 Subaru Outback 57k Silver/Black-SOLD
2005 C230K 18k Pewter/Grey-SOLD
1997 E420 108k Black/Grey-SOLD
1986 560sl 200k Black/Palimino-SOLD
1985 300sd 340k-SOLD
1979 240d 170k-SOLD
2000 Volvo V70XC-POS couldn't sell fast enough
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  #4  
Old 01-23-2007, 02:23 AM
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Join Date: Sep 2002
Location: Los Angeles
Posts: 963
Get a good quality one like a Behr or a Wahler. They should come with new gasket.

The manuals always tell you to first test it in boiling water to make sure it works, but I have never done this.

Get a benz parts catalog from ************************. Their exploded parts pictures come in handy. Of course, support this site by buying from Fastlane.

On my car, the thermostst housing is secured with three bolts (only 10Nm torque).

Note orientation of old thermostst, ball valve should be situated at highest point when installed.

glenmore
1991 300CE
2000 C280
1990 LS400
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  #5  
Old 01-23-2007, 08:54 AM
Sportlines
 
Join Date: Oct 2004
Location: Johnson City, TN
Posts: 985
First engine must be reasonably cool. You are going to lose some coolant, so you will also need some of the proper coolant on hand, mix 50 /50 with distilled water. If you have Green Coolant, then top off with Green. Hopefully it has the proper Mercedes Coolant or ZerexG05, sort of amber colored. If it does then use that.

You need a 1/4 ratchet, 6 inch extension, 10mm socket. 3 bolts. Expect the cover to be slightly tight. Tap and twist it free it up. Do not resort to hammering a screwdriver blade in there. Remove the cover.

Notice which end of the thermostat is pointing up. Remove, replace and put is back together using the new rubber O ring. The torque figure of 10nm is no doubt correct, but you would need a torque wrench. I do it by feel. No way to verbalize that to you.

Top off coolant at the expansion tank.

Your temp guage should then be around 1 needle width or so above the 80 degree mark and your engine will be happy.

Steve
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  #6  
Old 01-27-2007, 02:57 PM
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Join Date: Dec 2000
Location: Mountain Island Lake, Charlotte NC
Posts: 376
works beautifully, thanks for your help!

__________________
Rob Armstrong, Charlotte, NC
Mountain Island Lake
RobAinCLTNC@hotmail.com

2004 VW Passat GLS TDI-50k
2006 Honda Odyssey EX-L 7k
FOR SALE 1991 300TE 228k

2003 Subaru Outback 57k Silver/Black-SOLD
2005 C230K 18k Pewter/Grey-SOLD
1997 E420 108k Black/Grey-SOLD
1986 560sl 200k Black/Palimino-SOLD
1985 300sd 340k-SOLD
1979 240d 170k-SOLD
2000 Volvo V70XC-POS couldn't sell fast enough
Reply With Quote
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