Question about 1996 Mercedes-Benz E-Class
Turn your engine over and turn on the A/C on both high and low. Check your cooling fans to make sure they're operating. They are supposed to turn on with the A/C. If they do, you know the cooling fan circuts work so you need to make sure they turn on when the engine reaches temp. After you've reached operating temperature, check your upper radiator hose for flow. Squeeze it and let it go and see if you feel a surge of coolant rush past. You're checking thermostat operation here. If you have never had your cooling system serviced, have your radiator flushed and filled. They may be able to bring any blockage out by the power flush, but your radiator may be partially clogged thus restricting flow. Check the weephole on tour water pump (it may be on the top of the pulley shaft or underneath). If you see water, the seals are wearing out and the pump needs to be replaced. If all these check out, you can rent a Block Tester at Autozone for $25.00 (free loan a tool program, you get the money back when you return the tester) and a lot of test fluid for $8.99 (it will allow you to test multiple times). Remove your radiator cap and put the aspirator (bulb) in the top of the tester after filling it to the line with fluid. Hold this firmly in your radiator cap (you need to remove it before starting the engine). After the engine is within operating temperature, squeeze the aspirator for two minutes and pull air from the coolant into the tester. The fluid will either remain blue or turn to a blue-green, green, or yellow. If the fluid turns color, you have combustion/emissions gases in your coolant and have a bad headgasket or cracked/warped heads or engine block. You can also check for coolant in your oil. With the engine warm, pull out the dipstick and check the oil. If it's a chocolate milk like color and consistency, you probably have a bad head gasket. If all of this comes back as clear, have your cooling system pressure tested by a shop.
Posted on Jul 11, 2009
Your antifreeze ratio may not be 50/50 (antifreeze/water) and the radiator cap may need to be replaced. The cap should hold 8 lb of pressure but if there is to much water then antifreeze, the coolant will boil over faster but be careful not to have to much antifreeze. Too much antifreeze will gel up and cause over heating. Good luck and hope this helps. Start with the radiator cap replacement and flush out the oil antifreeze and replace with new coolant with a 50/50 mix, you can buy them premixed 50/50 if you not sure how to measure it. The proper amount your car takes is 9.5 liters total fill.
Posted on Jul 11, 2009
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Posted on Jan 02, 2017
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