Question about Mercedes-Benz 300-Class

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1982 300TD New radiator/Water pump/ Fan clutch/ Question:The electric fan is not coming on .I don't see any fan thermostat anywhere.I checked all fuses.I'm lost on this.Can you help?

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Fan does not come on till A/C is on (with good freon charge) or when temp reaches 105-110 degrees because redline isnt till 120. Thermostat is under the dome looking deal with hose going to it.

Posted on May 05, 2010

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Ihave a 99 vw passat 1.8 ,replaced head timing belt,gear,and cover,new water pump,thermostat,and overheats very quickly.it has 2 fans,1 electric the other is driven by beltsand is with fan clutch,clut


First, Ronald is an IDIOT! DO NOT power wash the engine EVER! If the engine is really hot and you spray ice cold water on it can crack the head instantly! Also, everyone knows' water and electricity don't mix! the ignition control module is $300. A little water on that and its gone!
If your car is overheating, you may need a water pump! The one you got, may have been bad! The rule is, as soon as a car overheats, the thermostat MUST be changed! A simple test would be to remove the thermostat and close it back up! A few dollars for the gasket is all you will spend! Try and run the car without it and see if it still gets hot! If it still gets hot, check the water in the radiator or resivor to see if the water is also hot. If its hot then the water pump is working and you need to check the fans! You can run a power wire to the fan to make sure they are working. There are relays for those also! If they are not turning on, that is most likely your problem! I rebuild VW's for a living!

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Fuel line burst causing fire ever since car keeps over heating and now its blown the head help please!!! I can fix the head but need any ideas on whym its overheating checked the thermostat it fine no...


Check that the fan is working properly, whether it is electric or a belt driven fan. A car will overheat if the fan doesn't function as originally designed.

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Overheats when ac on


When does this happen? At idle? Check fan clutch.Water pump while your at it.Electric pusher fan working? Other things are,dirty radiator,clogged........thermostat bad.don-ohio

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It is over heating . there are no leaks the type of clutch fan is thermal but i do not know if that is the correct one or not? it has a new thermostat,and new anti-freeze, water pump is the same when...


Physically look in the radiator under the cap for coolant level, and check the valve in the cap for sticking. If air is present in the radiator it can't get out, and more coolant can't get in,(from the overflow). Either clean the cap or replace it and check that it is the CORRECT cap.
Radiator fins dirty, clean with a strong stream of water, not high pressure water.
Radiator clogged, have it boiled out, or replace.
Thermostat stuck open or shut, replace it.
Water pump worn out, can no longer move enough coolant, replace it.
Fan shroud broken or missing....
Electric Fan(s) not working, Check the fan, relay, fuse and engine temperature sensor's.
Belt driven fan, belt slipping, fan clutch is bad, fan blades have flattened out.

Air dam under front bumper is gone, loose, or broken. It actually has a purpose other than scraping on the driveway or curbs. It forces air up into and thru the condenser and radiator. If it

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Could be a Bad radiator Cap? Low Water? Clogged radiator? Not enough air flow, Do To.... Dirty radiator fins? Bad Fan Clutch or Electric fan not running? Timing Off? Stuck closed Thermostat? Bad Water Pump? Blown head Gasket(s)? Cracked Cylinder Head(s), ECT....

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New water pump' thermostat,purge line. not heads or gaskets and still running hot


You say "Water pump thermostat" do you mean Thermostat or water pump? If you replaced the thermostat and still have an overheating problem then look at the water pump itself as the problem if that is replaced and you still have the problem then you have another problem in the engine or a clogged radiator core. You may have a lubrication problem in the motor, if the oil pump went out or your low on oil then the engine may be overheating from lack of lubrication. Another thing that will cause overheating is if the Fan is Electric and not activating or if the radiator fan is mechanical the clutch is not allowing the fan to rotate free when you are driving.

Feb 18, 2011 | 1996 Cadillac DeVille

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My car is overheating and i need to know how to put in the water pump?


Is the water pump leaking coolant? If not, then why do you think it's bad?

If the engine is overheating, there are several other things to look at before you consider the replacing the water pump.

Are the fans electric motor driven, or fan belt driven? If fan belt driven, replace the fan clutch. If electric motor driven, check the fan control module and/or fan motors to make sure all is good there. Fan control module tend to fail in weird ways, so if nothing is wrong with the motors, replace the module.

Always, always, replace a thermostat that has overheated. Once overheated, they consistently fail. Make sure you properly refill the radiator with coolant after the stat is changed.

Check that the bottom radiator hose does not collapse.

Check the radiator for corrosion. Boil the radiator out, or have it done, or replace the radiator.


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Car is overheating


2 Inspect Belt Incorrectly routed, adjusted, tensioned, missing, or worn water pump belt(s). grey_line.gif 3 Inspect Oil Pan Gasket - Performance Ruptured, cracked or leaking radiator hose. grey_line.gif 4 Inspect Radiator Cap Worn or damaged radiator cap grey_line.gif 5 Inspect Thermostat Thermostat stuck closed grey_line.gif 6 Inspect Fan Blade Broken, missing, or defective fan blade(s). grey_line.gif 8 Inspect Water Pump Damaged, worn or leaking water pump. grey_line.gif 9 Inspect Intake Manifold Plenum - Perform Leaking water pump gasket. grey_line.gif 10 Inspect Cooling Fan Control Faulty cooling fan control or circuit. grey_line.gif 11 Inspect Cooling Fan Switch - Radiator Faulty radiator cooling fan switch or circuit. grey_line.gif 12 Inspect Engine Temperature Sensor Faulty engine temperature sensor or circuit. grey_line.gif 13 Inspect Temperature Switch Damaged or faulty temperature switch or temperature switch circuit. grey_line.gif 14 Inspect Fan Clutch Worn, loose or faulty fan clutch. grey_line.gif 15 Inspect Ported Vacuum Switch Damaged, leaking, or faulty ported vacuum switch. grey_line.gif 16 Inspect Radiator Obstructed radiator core or radiator cooling fins. grey_line.gif 17 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders here is a list of things to check Shaun

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