Question about 1996 Plymouth Grand Voyager

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Radeator fans not comming on when temp is hot

R&R fan assembly all new , temperature sencer

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  • Anonymous Apr 29, 2009

    A/C works, Radiator fans do not come on - engine temp hits H, engine overheats, bells sound, fans still not coming on. Tested no power getting to fans, no power getting to fan relay located on radiator

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Check for possible broken wire to/from sensor.

Posted on Mar 25, 2009

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My 2005 Jeep Liberty Renegade had a small crack on the top right side of the radiator. Replaced the radiator with new one. Put everything back together, put in new coolant and burbed it. Now when the...


the FSM book covers this.
how to test the fan.
you do this parked.
with a scan tool first. look for dtc errors hot.?
make sure the ECT reads correct using the SCAN tool.
180F+ is good.
the let car idle. it will overheat idling, they all do, but not in Alaska.

as the temp hits the PCM thresholds , the PCM commands on the fan and it runs, dropping temps back to 180F
(can i assume you put in a new thermosat with rad.
that be the perfect moment, they are short lived parts
and the numbers stamped on it it must be OEM spec, temp.
nothing else.

The fan relay closes at too hot temp (PCM decides)
the coil on relay goes to 12vdc (meter across pins)
if coil is 12v and 12v out of relay to fan is 0v.
then the relay is bad.
if the coil never goes hot, we have a serious problem.
the ECT must see the overheat, if there is an air pocket at ECT
it will not read temps, true, but why low, .
and fan will no come on.
that is how it works. most modern car.

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Yes, it is possible to install a thermostat backwards, though unlikely. If the thermostat isn't opening properly, the hot engine coolant won't be flowing over the cooling fan switch and give you high temps. I would first determine if the thermostat was opening at all, and if it is, is it opening at the proper temp. I have had many new thermostats that, while new, didn't work correctly. To check the cooling fan motor, turn on the AC(if equipped) and the fan should engage. If no AC, disconnect the cooling fan switch, and the fan should engage. Check for power and ground at the fan motor. If you have both power and ground, the fan motor is faulty

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if the fan is not working check fuses temp sensors for the fan or fan clutch if not electric fan
if the fan is working then the engine head gasket is leaking and theta,s cause of your over heating

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HOT WIRE COOLANT FAN. STILL DONT TURN ON REPLACE FAN ASSEMBLY. IF COOLANT FAN DOES TURN ON WHEN HOT WIRED.CHECK THE FAN RELAY OR FUSE ALSO SCAN VECHICLE FOR FAULTY COOLANT TEMPERATURE SENSOR IF ENGINE COOLANT TEMPERATURE IS 190 DEGREES AND SCANNER SHOWS 80 OR LOWER COOLANT TEMPERATURE SENSOR FAULTY.

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Lincon LS 2006 5600 kl coolent fan runs in winter when the temp gage is normal the radeator is not hot.The fan is very noisy, the engin has ben bled of air. The car has ben looked at by Lincon dealer said...


the fan has a low and high speed or some have 2 fans. It comes on low speed when the temp starts to climb or when you turn the a/c, defrost, or mix mode (it turns on when the a/c compressor kicks on. If the temp of coolant gets to about 230 F, then the high speed kicks in.

What is your doing? Very nosiy sounds like high speed. Could be a defective ECT - engine coolant temp sensor.

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try replaceing your temp sencer. some time they are near the goose neck or on the block ok . and see if your fan sencer is working. good luck

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The radiator fan is controlled by a temperature-sensitive switch normally found near the bottom of the radiator. Once temperature is reached, it should measure a short (using a meter) to ground since the 12 volts is normally applied to the fan and the other motor lead is grounded through the switch.  
If no coolant is circulating after warmup, the thermostat has failed to open at the prescribed temperature which explains the cool radiator temp. If you try the heater, you will probably find that it heats like crazy since the heater in most cars gets coolant well before the thermostat opens and starts to divert coolant through the radiator.
I hope the previous owner did not drive the car very far with a bad thermostat and fan switch since an overheated motor is prone to blow headgaskets and warp the head.
You need to buy an aftermarket service manual from Haynes (better) or Chilton (just OK) soon.
The problem with your brake lights could come from several sources and to trace the wiring (if the fuse is not blown for them), you will need a diagram from one of the named manuals.  

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