Question about 2004 Mercedes-Benz C-Class

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I got c180k 2004 when I am in heavy traffic the temperature gose up and show 'coolant see showroom' when the traffic easy up and start to flow the temperature goes down.I try to run the engine for a long time and check if the fan gose on, what I discover is the fan sometimes gose on just for less than a mim and turn off some times it will never gose on when the temperature is high. I change the coolant sensor , temperature sensor and the thermostat still can't get rid Of the problem please help.

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Possibly faulty electronic fan control module which is inside the radiator fan, must get your car in to the Mercedes workshop and read fault code and also they can activate and check is the fan is working or not by there diagnostic CPU, if the activation dos not work, then replace the radiator fan , is this information helped you?

Posted on Oct 23, 2010


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1 Answer

Should the cooling fan stay on constantly?


If the cooling fan stays on permanently when driving it means that your engine is overheating - and you would notice the heat!

Check your coolant level though.

It's probably the (faulty) switch that kicks in when the engine gets to a certain temperature .. like when idling along in heavy traffic .. and not switching off when the temperature drops.

An easy fix, assuming all is okay with your coolant system/cylinder head.

Give a mobile mechanic a call. These guys are good and cheaper than a workshop call out.

Nov 03, 2015 | Cars & Trucks

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Volkswagen Passat 2002 overheats when in traffic/stationary

Unfortunately you've bought a European car towards the end of its useful life. Next it's headliner is going to drop down and the door panels all start clicking, suspension rubbers are going to fail and the list goes on.

Make sure on that car, the lower engine cowling is still fitted. Some people remove this as it can make a noise at speed, especially if it is split, however this directs air flow across the engine, and causes a low pressure area, which helps this effect.
If you remove that lower engine cowl, then air will not flow efficiently.
Next, remove and check the operation of the thermostat.
Check that the engine coolant is clean, there is no sign of rust in the system, which could be blocking the radiator.
With your hand, or with an infrared temperature sensor, when the engine is hot and I know this sounds a bit dangerous, which is can be so take care, feel the radiator from top to bottom or take a temperature reading. You are feeling to see if the temperature is too disproportionate from top to bottom. If it feels this way, then it might well be that the radiator core has become blocked.

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My engine temp gauge goes way up when the car is stuck in traffic, when I begin to roll the temperature gauge goes back down. I assume that this is a sensor issue, can this be changed easily?

I would assume that the sensor is probably doing EXACTLY what it is designed to do....measure engine temperature! An engine will get hot when sitting in traffic if the radiator cooling fans are not working. The engine temperature will then go back down when the vehicle starts moving and air begins to flow through the radiator.
Get your radiator cooling fans checked!

Please also review this article: What Else Could Be Wrong?

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I have a 2004 Pontiac Sunfire. When the car is in idle the air blows out hot and the Temperature gage rises and the car over heats. When the car is moving the air blows out ice cold and the temperature...

Sounds like your cooling fans on the radiator are not working. The fans are activated by a thermol switch on the engine or radiator reading the coolant temperature and an A/C switch. When the coolant is too hot the fans should activate cooling the system down. And, when the A/C is on the fans should also activate in order to cool the condensate so the A/C would work.

When you are driving, the movement of the vehicle throught he air is providing enough air flow to keep things cool and functional.

I would check the radiator fan fuse or fuses first. If those are OK I would try to run the fans with 12 volts and a ground that I supply just to see if the fan motor(s) actually run when powered. If the fan don't run when powered then the fans are bad and will need to be replaced. If the fans do run when you power them manually, then something is not allowing the power to activate, like a relay, control unit, or wiring.

It will take a little diagnostics, but it is not too difficult to chase it down.

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The temperature light on the dashboard flashes and an alarm sounds after I start the car or when stuck in traffic. The temperature gauge is showing at 90. Any ideas?

Your pump is shot... The shaft from the impeler came loose and not pumping the coolant at any speed. While more noticeable during idle or traffic. At cruising speed the air flows through the radiator lowering the temp a bit without any warning. You can buy a kit that also covers replacing the timing belt since it's in the way and a good idead to do it together.

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Usually when the windows are closed and the smell of coolant gets inside the car means the heater core has a leak. The leak can be the very tiniest and the smell will be very noticable to anyone. If the windshieild fogs up the leak is getting larger.

Check the radiator cap ton see if its holding the correct pressure. That will cause the temperature to fluxuate as well.

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Bmw 523i se heater blows hot and cold

Sounds like a thermostat sticking. Some things to do. First check coolant level is up and moving. Second (most likely), change thermostat. Very easy fix for backyard mechanic. Make sure to put thermostat in so water flow is correct direction. Look for arrow on side of thermostat. Next, is belt to water pump loose. Another easy fix in most cars.

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