Overfilling a coolant reservoir.......isn't possible since they have an overflow line.... Water is cycled back and forth as needed... with movement of water, air in the top of the reservoir is obviously necessary, since overfilling the reservoir would cause the overall cooling system to fail to do its' job!....... In otherwords, If you try to overfill the coolant reservoir tank, it shoud automatically start draining the excess water/coolant onto the ground. The other reason for the overflow is to protect from high pressure in times of high temperatures..... steam and water can both escape this way. Chris... c-tekk@hotmail.com
bad water pump There are min and max lines on your coolant reservoir, are you overfilling(only antifreeze not water) and then when the truck heats up it overflows? Or has the coolant system been bled of any air bubbles(after changing the water pump for example)?
Low coolant, bad coolant, blockage in the coolant line, bad heater core or element, bad thermostat
Probably a bad thermostat.
To add coolant to and 1985 Mercedes 380se find the reservoir located in the engine bay next to the radiator. Make sure to use the proper mixture of coolant to water ratio and pour until the appropriate level. Overfilling can lead to sprouting a leak while the engine is running.
The coolant level sensor is bad
lOW COOLANT OR BAD SENSOR
Either your coolant is actually low or you have a coolant sensor bad.
Low coolant?Bad sensor?
Yes, overfilling can cause smoking, and you need to drain the extra out.
If coolant level is correct--sensor may be bad If coolant level is correct--sensor may be bad
Low coolant, bad coolant tank cap, stuck thermostat, or clogged coolant line.
Bad sensor? == ==