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  #1  
Old 08-01-2001, 03:31 PM
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Driving without thermostat

I live in Kuwait(American). We have long and very very hot summers. In the mornings when I go to starty my car the temp gauge is allready around 40C. I am considering removing the thermostat for the summer season , to see if this would make the car run cooler.
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Old 08-01-2001, 04:03 PM
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Re: Driving without thermostat

Quote:
Originally posted by crookednose
I live in Kuwait(American). We have long and very very hot summers. In the mornings when I go to starty my car the temp gauge is allready around 40C. I am considering removing the thermostat for the summer season , to see if this would make the car run cooler.
If the car runs too hot now, it will likely continue to do so with the thermostat removed. However, driveability will likely become worse during warmup.

Steve
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Old 08-01-2001, 05:25 PM
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Proper fuel system operation is dependent on specific temps. Running w/o a t-stat can foul things up.

This is one of those times when a mixture of water only AND some sort of water pump lube MIGHT work out.

I saw a web-based article several months ago that showed the U. S. Army running H2O and Water Wetter in H2O cooled bikes in your part of the world. Check out the Redline web site. It may be there.
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Old 08-01-2001, 05:48 PM
birdy
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Actually, I once had a problem with an engine overheating. I took out the 180 (it was brand new) and put in a 190 thermostat. The 190 would slow the coolant down enough to cool off while in the radiator. The 180 was open full blast and the coolant ran through the radiator so fast that it didn't have enough time to get sufficiant air to cool off. Just my experiance. Try that first before you go without a thermostat.
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Old 08-01-2001, 06:20 PM
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remember cooling basics: ensure that radiator (inside may need re-coring), fans & air flow, H20 pump, & thermostat are operating correctly as designed and at peak efficiency

...appropriate lighter weight oil may help too; after that you may wish to add cooling system upgrades

good luck
-fad
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  #6  
Old 08-01-2001, 10:45 PM
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Thermostat is necessary

The thermostat in MBZ does 2 things at once--opens the passage to the radiator, and CLOSES the recirculation passage.

Without the proper thermostat, coolant will just recirculate back to the water pump without ever going through the radiator.

Pure distilled water and Redline Water Wetter has been well recomended.

Also, run a lower concentration antifreeze mix 30% max. It cools better.
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Old 08-02-2001, 02:28 AM
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More info

I have checked all cooling related items and repaired a couple of questionable wire connections and everything is in good shape. The car runs at 80-90 C at highway speeds with is good for here, but if I am stuck at a light for a couple of minutes the temp gauge does a steady rise and tops 100 C in no time. The car runs ok but sometimes gets a little pinging above 100 C, so maybe I am worring about nothing.This is an even bigger problem for the big engined Mercedes here and you can get some really good buys in the summertime when everyone wants to dump them expecially the V-12's. I have driven some of these and they peg out very quickly at the lights. The temp here in summer is 115-120 F, unoffically it is much hotter in stop and go traffic.
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Old 08-02-2001, 11:16 AM
birdy
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I'm new to forgien cars, but I know on GM they have a clutch for the fan and if that goes out, the fan that draws air across the radiator when you are at a stop won't turn and your temp rises. And when you start moving, your motion pushes air across the radiator which cools and the temp goes down. The pinging could be from the high temp too.
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Old 08-02-2001, 11:52 AM
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You didn't mention the make/model/year, but I can tell you that 80C-90C on the highway and 100C at idle is not at all unusual here in the U. S. in 100F temps. If you're running no hotter than 100C at idle in 110F-115F, you're ok.

100C is 212F. That's not unusual for a pressurized system running a 50/50 mixture.
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Old 08-02-2001, 01:22 PM
arochard
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My car's temperature also rises slightly in stop and go traffic. Check to make sure that your aux. fan is working and coming on when necessary. Also, as a quick fix in a desperate situation, turn on the heat in your car (and turn down the windows of course). By running the coolant through the heater, it helps to cool the engine's temperature, you'll notice the temperature go down to a more comfortable level if only temporarily.

Good Luck,

AARON ROCHARD

1976 230.4 W115
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  #11  
Old 08-02-2001, 06:38 PM
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The connecter to the 100 degree fan switch just just melted and also melted the insulation on the switch. The reason it melted was that the previous owner had put a makeshift jumper to make the fan run in high speed all the time to keep the temp down. This meltdown caused the fan to run intermintely in low and high modes, which explained why the temp would vary so much. Thanks for the help.
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