Why may cars transmission strain when the car reaches 90c?
08-21-2018, 10:23 AM
#1
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Mercedes S430
Why may cars transmission strain when the car reaches 90c?
2002 S430 Mercedes Benz. I have change the water pump, flush the radiator and replaced thermostat. The fan kicks on near the 90c mark. When the car reaches the 90c mark the transmission strains in the 1st and 2nd gear. At 80c the car runs fine.
08-21-2018, 01:13 PM
#2
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Hey, I might be wrong but your radiator cools transmission oil as well. And based on your work with "cooling stuff" you either did something wrong or damaged something and now transmission aint getting cooled.
08-21-2018, 01:40 PM
#3
the transmission cooler is built into the radiator . You might have a bad radiator
08-21-2018, 01:44 PM
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Mercedes S430
Car running hot
This problem has going on for a while. Change pump and flush radiator because i thought that was the problem. The thermostat was change about a year ago. The transmission fluid have been changed also.
08-22-2018, 10:02 AM
#6
MBWorld Fanatic!
Modern vehicles, including your W220, are designed to operate at a coolant temperature of 90 deg C.
This brings up several possible questions...
Is the coolant temp gauge correct?
Is the transmission cooler operating correctly?
Is the coolant circulating correctly?
Is there another problem with the transmission that causes it to malfunction at what should be its normal operating temperature?
This brings up several possible questions...
Is the coolant temp gauge correct?
Is the transmission cooler operating correctly?
Is the coolant circulating correctly?
Is there another problem with the transmission that causes it to malfunction at what should be its normal operating temperature?
08-22-2018, 12:00 PM
#7
MBWorld Fanatic!
most cars have barely enough cooling.In the days of ordering a towing package you got more rows in the radiator,and extrenal trans cooler. The w140 with large v12 even cooled trans seperate in the cool air. I use a extra cooler with my 722.6xx,I don't want trans temp to be radiator temp.
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08-29-2018, 01:10 PM
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Mercedes S430
I have replaced the radiator, water pump and thermostat. Filled with water the temp gage stayed between 80 and 85c. Drained the water and added antifreeze temp gage goes back to 90c. When car reaches 85 to 90 c the trans mission starts to strain in sec and third gear. If the car remains at 80-82 trans run fine.
08-31-2018, 03:32 AM
#9
I have replaced the radiator, water pump and thermostat. Filled with water the temp gage stayed between 80 and 85c. Drained the water and added antifreeze temp gage goes back to 90c. When car reaches 85 to 90 c the trans mission starts to strain in sec and third gear. If the car remains at 80-82 trans run fine.
also called a tropical climate thermostat
