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My 2001 Mercedes Benz ML430 heat up slowey I turn the car off n back get gets warm then it gets cooler as I drive what do you think the problem could be I change the thermostat and the water pump ok

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Check your radiator and see if it is full . If not that could be the problem. Check your hoses and see if any are pinched.
could be an air lock in your system.
Water pump may not be working properly. Just an idea.
A plugged or blocked radiator will not let the fluid flow enough to heat all the time. Does your heat gauge go up where it should be if not your new thermostat may not be working right. Is it installed properly? I installed one upside down one day and it did the same as yours.
These are ideas only.

Posted on Dec 17, 2016


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Posted on Jan 02, 2017

  • 1214 Answers


Are you putting the thermostat in correctly? It it will not work backwards.

And to confirm that there isn't a different problem, take the thermostat out all together and see if it overheats.

Engine not fully warming up is not usually caused by the thermostat. Stats usually fail closed, not open.

You will want to check the water temperature sending unit or gauge after verify the water temperature with an external calibrated thermometer. You can attach and insulate the external thermometer to the housing where thermostat is located.

Reply back what you figure out. I will be happy to help you further.

Posted on Feb 03, 2009

  • 123 Answers

SOURCE: Mercedes 300te, overheating

put alot of antifreeze on the radiator.this just happened to me last week and now it is fine
bet it cools a bit while driving NO? and than when you stop the gage goes up

Posted on Apr 21, 2009

  • 78010 Answers

SOURCE: mercedes benz e320 wants to overheat checked water

the most common causes of this are plugged radiator cores and the other is a leaking cylinder head gasket.

Posted on Sep 17, 2009

  • 784 Answers

SOURCE: how to replace a water pump on mercedes e320 1997

It is not complicated, depending on what hands-on level of DIY on car. Here are what need to do, so you can estimate how easy or hard when you look through your engine. Drain all the coolant, remove the thermostat housing, remove the fan, belt. Remove the water pump pulley. There are 4 bolts to hold the water pump in place.If you think you can take them out and put them in without removing the AC compressor then you can do it. I did it twice without removing the AC. The pump was fine for the second time, but for leaking seal. At dealer, it is easier to access from the bottom since they have a lifter. But it is doable at home. Have fun if you decide to do it.

Posted on Oct 11, 2009

  • 3513 Answers

SOURCE: 2001 Merces Benz ML430. How to change Water Pump.


Please find the step by step replacement of water pump:

and for the other you can download a complete set of instruction in pdf format in the bellow article:

Please get back to us if you have further query else please accept the suggestion.

Thank you for contacting

Posted on Feb 28, 2011

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