Question about 1995 Volkswagen Passat

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Cooling fan coolingfan (radiator) doesn,t come in when temp. is rising. The whole system is getting hot, including the heater in the cabin so there is no obstruction and the thermostat is working (i Think). I also disconnected the fan connecter and applied directly 12V. Both speeds are working. My question, by which signal is the fan opperated????

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  • Larry Mack
    Larry Mack May 11, 2010

    should be a thermal fan switch somewhere along the line. i

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Here are the cooling system diagnostic steps...First does the cooling fan kick on (with engine hot)? If not, check the fuse, if good then check the thermoswitch in the radiator (it's about an inch and a half in diameter located on the lower part of the radiator with two wires ) by disconnecting the wires and touching them together (again, with engine hot...at least 190 degrees) if the fan comes on, you have a bad switch. If not connect a 10 gauge jumper wire from the battery to the fan itself (there are three terminals,,, one high, one low and ground). With power direct from the battery (and a ground wire, if necessary) fan should run... if not replace the fan assembly... if it does run then you have a bad cooling fan relay (under the dash, I believe). Hope this helps... ;-)

Posted on Apr 21, 2009

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My 2004 3400 closed system ,runs hot in town unless heater is on. driving up a mountain pass it gets very hot.on a flat highway runs normal. new t state,resivior cap, both fans work no leaks or smell


Radiator fan motor or radiator fan thermostat defective/

Also there is a relay that operates the fan motor

In town not enough air passing through radiator allowing it to over temp.. With heater fan running acts like cooling fan keeping engine cool

Highway driving ample air passing through radiator without fan.

Hill climbing requires cooling fan/

Hope this helps?

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Nov 17, 2016 | Cars & Trucks

1 Answer

Fan stays on ,wont let the Radiator get hot .so i m not getting any heat


Hi Fred.

I'm not totally sure I understand your question, but I'll take a shot. Are you saying that the engine fan stays on all the time for your car, keeping the radiator cool, and so you're not able to get any heat in the cabin air? Or possibly that the cabin fan is on all the time and you can't get any heat because it's keeping the radiator cool.

unless there is something very odd about your car (or you're living at the south pole), your engine coolant will be plenty warm within a few minutes of starting. If you are doubtful, drive the car for 5 to 10 minutes, stop, turn off the motor, pop the hood, and carefully move your hand close to the radiator. The blower fan helps transfer heat, but that's to move the coolant temp down probably into the 150-200F range.

if you're not getting any cabin heat, I'd have stronger suspicion about the heater core for your air system. In the majority of vehicles, there is a loop of coolant that comes off the back of the engine block, through the fire wall, and up to a U-Bend of pipe. When the heater is off, the coolant is just re-directed back to the engine. As you turn the knob or lever for cabin heat, it'll turn a switching valve to shunt the hot coolant into a heat exchanger/mini-radiator that the cabin air blows past. This system being a mini-radiator is why highways with long uphill grades will advise motorists to turn on their heater full heat, highest fan, when climbing in the summer. it's an additional way to keep the engine from overheating, even if it sucks for people in the vehicle.

Depending on the car, it can be either easy or really involved diagnosing or repairing the heat exchanger. if you go this route, you'll want to make sure that the coolant is circulated through the core thoroughly and that the coolant-system is de-bubbled.

Good Luck!
D

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Make sure the cooling system is not plugged up, poor coolant flow can make your engine run hot, and a plugged heater core will not allow heat in the cabin in the winter.

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In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

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If it has an electric radiator fan (not AC fan) The radiator fan is not working. Possible coolant sensor or switch.

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Replace the thermostat. After that, if problem persists, feel the radiator with engine at normal operating temp. If part of it feels cool, this would indicate a restricted radiator, Very common.Also purchase a block tester, available at napa or other reputable parts store for about thirty dollars. Follow directions, cheapest way to find head gasket breech into cooling system. Good luck!

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My 2001 ford focus is overheating it doesnt seem to be losing water and if i turn the heater on the temperature goes back down


you might want to see if the cooling fan is working at the radiator.if its not then the fan motor may be no good.by putting the blower motor on you are giving the system air flow to pull heat out of the cooling system by it blowing air over the heater core.you can remove the plug on the fan motor and connect jumper wires directly from power and ground to the connectors on the fan motor,if the fan doesn`t work then the cooling fan motor will have to be replaced.you also could have a thermostat that is not opening all the way causing a rise in engine temperature.

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When i turn the A/C on, the temperature begins to rise and it begins to spill the antifrezze from the radiator reservoir. Dont know what the problem is.


You evidently have a problemwith your engine cooling system. Check to make sure that the cooling fins on your A/C Condensor and Radiator are not clogged up with dirt and debris. Check that your mechanical fan clutch has some resistance to pushing it by hand. If it spins too freely. the fan clutch could be worn out. Check to see how much air it is actually moving through the radiator. When the engine is at operating temperature and the A/C is on, This fan should be turning at a very high speed and blowing HOT wind in your engine compartment. I believe that your vehicle is also equipped with an electric cooling fan. The electric cooling fan should be running any time the A/C compressor is engaged. If not, then you must diagnose this failure.

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2000 Chevy Silverado normal operating temp is 210 , recently temp rises to 250. Its been this way for a few days, common operating temp is around 240-250 now, but does not overheat. Coolant levels are...


250 TOO HOT FOR ENGINE AND TRANSMISSION. SOUND LIKE COOLING FAN CLUTCH BAD ITS FREEWHEELING NOT LOCKING UP TO DIRECT DRIVE TOO COOL ENGINE OFF BECAUSE THE FAN CLUTCH THERMOSTAT NOT WORKING THE HOT SILICONE OIL CAUSE IT TO EXPAND TO PUT RESISTANCE ON CLUTCH TO PUT DRAG ON FAN CLUTCH CAUSING IT TO LOCK IN GIVE IT DIRECT DRIVE.I WOULD STILL REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP IF TEMPERATURE STILL 250 DEGREES YOUR RADIATOR AND COOLANT SYSTEM NEED FLUSHING.

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