Pls help me ragarding my 1995 s420, it's running hot like gets to 120 specially when on traffic and AC is on. Then when it runs the temp. goes down again. Already replaced my fan clutch, slowed it a lot but still goes up after sometime and I am in vegas, weather here is very hot during summer. I have no problems starting it anytime. Local dealer told me nothing wrong with temp. and blower turns on when AC is on(auxilliary fan) I mean. HELP ME PLSSSSS

 

mine did that once, turned out my rad & condenser were cloogged.
cleaned it out with compressed air and water, worked out perfect.
so i would check that.

 

I already had the radiator flushed but didn't think about the condenser. I will try that thank you very much

 

i was talking about the actual coils on the rad. and condenser.
if they are clogged no air goes thru it. no air no heat transfer.
but its good that you got the rad. flushed.

 

my s-500 did that once and it was the thermostat and my antifreeze levels were low. i topped off the anti freeze and replaced the thermostat and it hasnt happened since,

 

Something that a lot of people do not think about is when rinsing dirt out of their condenser and radiator:
Be careful when you are cleaning the radiator and condenser coils. Do not use pressure washers as they can bend the flimsy fin material and might make any overheating problem worse. Use a garden hose and rinse the radiator from the engine side to get any debris stuck between the fins lose. You should not rinse it from the bumper side into the engine compartment as you most likely will embed any debris deeper into the fins thus stopping it up even more.

Ruben

 

First of all, let's differentiate between high -- higher than normal -- coolant operating temperatures and actual overheating. An engine doesn't truly overheat until coolant temperatures spiral completely out of control, reaching the point where the coolant, even under proper system pressure, boils. When this occurs, the gas bubbles generated in the coolant reach the water pump impeller and interrupt the pumping action and flow of coolant -- mercedes radiator buy which accelerates the overheating process even more. check this for m0re info: http://www.startribune.com/131/story/507348.html