The car is completly turned off - but something still running under the hood (?? fan or generator) sounds like a vacuum cleaner running under the bonnett. It is a C240 Stattion Wagon Mercedes Banz 2002.
Thank you. It actually appears to be some sort of small pump on the top front of the motor. We pulled the wiring off, which was the only way to stop it runniingThank you. It actually appears to be some sort of small pump on the top front of the motor. We pulled the wiring off, which was the only way to stop it runniing
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Cooling fans will run after the engine is shut down. The coolant doesn't. This would be a faulty coolant sensor, PCM, or a fan relay that is sticking. You can swap relays and see if it is that. After that, it needs to be to a scanner to read the temps and PCM. If want to take a chance, you could replace the coolant sensor. I can't tell you where it is as I work on to many types of vehicles.
It sounds like you definitely have a vacuum leak. Trace your vacuum lines coming out of the intake manifold. There should be a diagram under the hood, on the shroud or on the underside of the hood. If not Google search the vacuum routing for your vehicle. Its possible that you have a line that has been rubbing against something causing a hole, a line could have broken because the heat dries them out and they crack, (plastic lines) or a vacuum line could have just popped out of its grommet. Hope this helps.
check all the vacuum lines, and the PCV valve, get a can of carb cleaner, and while the motor is running, spray short bursts of the carb cleaner all around where vacuum lines are located, if the motor rev's up thats where your leak is going to be
You started the right way.
It sounds like it needs a tune-up.
Change the sparkplugs - Use Autolite Platinum ($3.87 for two at WalMart; $6 each at AutoZone)
Also, check for faulty sparkplug cables as follows:
1. When it is getting dark outside, set the parking/emergency brake.
2. Open the hood.
3. Start the car and look under hood for "sparks" from the sparkplug cables to the engine (or other metal part).
4. DON'T TOUCH anything under the hood! The cables can shock you (bad!) or the fan can cut you or the Boogeyman may reach out ... (sorry)...
5. Turn off car .. that ends the cable spark test.
6. Replace ALL sparkplug cables if any create a light show under the hood.
Check under the hood and see if you have a decal that says fan may turn on after car is turned off. The fan can run for 10-15min after shut-off. If it's on for only that length of time and it's killing your battery, you may need a new battery. If it's not turning off at all, open fuse compartment under the hood, take a small rubber mallet and start to tap the relays. There should be one there for the cooling fan. Once you find it, (the fan will turn off when it's tapped) you can exchange the relay for another (of the same part number - like the wiper relay or A/C relay or something) restart car, let it run til hot, and turn off. If fan shuts off within 10-15 minutes, you need a new relay.
There are extra cooling pumps that some foreign cars have that run for a designated time after the engine is shut off. I had a Mini cooper made by BMW that had it. If you hear it running for a while, but then it shuts off, thats normal. If it stays on for ever and never shuts off, I honestly don't know what to tell you
Mine did the same. I eventually found the problem to be the secondary fan, which heats up the intake air when the car is cold to make it start up better. there is a switch/solenoid attached to the fan unit that goes bad and needs to be changed.
Thank you. It actually appears to be some sort of small pump on the top front of the motor. We pulled the wiring off, which was the only way to stop it runniing
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