Question about 2005 Chrysler Town & Country

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COOLING FAN GOES OFF AND ON WHEN CAR IS COMPLETLY COLD

COOLING FANS GO ON AND OFF EVEN WHEN ENGINE IS DEAD COLD. KILLS BATTERY SEEMS LIKE A SHORT OR RELAY SWITCH PROBLEM. ANY HELP?

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There is a sending unit from the block to the fan. It closes the switch when hot enough and turns the fan on. This is more likely than a relay or short.

Posted on Jun 16, 2009

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Could be the temp sensor for the coloing fan you have 2 one for the ecu and one for the fan

Posted on Jun 16, 2009

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2 Answers

Fans not turning on and replaced the coolant temp sensor? Coolant in reserve but not in radiator?


why do you have ? on facts? odd that.
my guess replaced ECT ! not ?
my guess, doing so , now engine is full of air, and not fails.
as all do.
front RAD cooling FANS, right? (not heater blower )
it don't work like you think, ? huh?
what does" not in Rad "mean? with ? marks?

means you trust the silly side tank and not look in rad? fail you will.
when doing cooling service, learn read a book first.
read how to fill and burp your engine, Just like feeding a baby it is.
is engine overheating?
did it , has it, or ? , what started this saga, tell a full story?
and WIN !
Facts: on this system.
the fans are controlled by the computer brain, under a complex set rules now. it's not some mindless switch like days of old.
sorry!
ill now answer for USA 03, how ours work,
ONLY!
ours has one fan., (not fans)
ours has a 3 speed fan (at rad back side.)
and has rules to run all 3 speeds, via 3 relays
the PCM/ECU decides this, based on if A/C is on or off.
and a complex set of rules (uses the ECT for this magic)
Fact 2: ECT will not work with air pockets !!!!
The PCM even turns on and turn off are not same temp!!!
Rules:
1: Rad must be filled of AF/ 50% antifreeze cold, to the top neck of RAD filler.
2: rad and engine burped of all air pockets, ask it's same on all cars.
3: the ECT must work, right, if air pockets there, it CANT work.
4: park car, idle until the minimum engine time is reached parked.
about 180F, but all cars overheat if parked, idling and fan stays dead.
fan is off , and at some point, the fan goes to low speed.

this varies by engine option, but is around 225F. (stage1)
THE FSM covers these checks, and rules, and temps. for all 3 stages of fan speed.
scan the pcm yet>?
got P0128 DTC? or others, for temperatures wrong,
not scanning is a big mistake on all modern cars.
big time!
yes, rad must be full parked cold, yes, yes, yes...
side expansion tanks do fail. for many reasons. ask.

a 2.0L engine. only, here. 7.4quarts cooling cap.
here is ours. usa fan. a 4 wire fan it is....
the ecu controls it using SOFTWARE, (firm-ware in truth)
26098393-rlcj0qgtvzvpudyok3p1nj5o-4-0.jpg do not drive car until all air is burped out of engine and rad.
DO NOT!
in fact run it idling to hot. 180f. ( too hot to touch long)
, kill engine with key.
let cool, to luke warm, or cold.
check rad level. (sure its low)
top it off, cap it,
repeat 3 times, before driving or if it holds levels.

Feb 17, 2016 | 2003 Suzuki Aerio

1 Answer

Fan comes on when engine not running and running the battery down


Hello
Start car Check out fan should not work when engine cold ( ac off)
when engine gets hot enough fan should work cool down engine and stop. locate the unit controlling the fan and see if there may be a short of unit or wire to unit

Feb 17, 2015 | Cars & Trucks

1 Answer

I have a 2007 Toyota matrix and the fan that cools the motor will not shut off even when I turn the car off, this causes the battery to run down, any ideas what the problem might be


Does the fan really run until the battery goes dead?? OR are you afraid that it might run until the battery is dead?? In many cars, the fan will continue to run for a short time after you shut it off.... until the engine coolant is cooled to a certain point. It can also run for a while when you've been using your air conditioner. Now, if it is actually running continuously and won't turn off, there is a sending unit somewhere that isn't functioning correctly, either in your cooling system... or your air conditioning system. You're going to need to do some research and find out which sending unit might be the culprit..... or take it to the shop. They'll know what to do and can probably quickly fix it.

Dec 03, 2013 | Cars & Trucks

1 Answer

The cooling fans keep running, on my 90 acura legend, even if the engine is cold and hasnt ran for hours or even days.. They cycle on and off as if the temp. sending unit is saying the engine is hot.....


This question got duplicated several times for some reason.
You would check the fan relay to see if the temp sensor is grounding it, if the relay is hanging on, or if you have a short in the wiring.
The blue wire goes from the temp switch to the fan relay and the fan control module.

Jan 16, 2013 | 1990 Acura Legend

2 Answers

The engine cooling fan will not stop. Battery was dead yesterday, needed new one, put it in, then fan started and would not stop (for hours)had to disconcect the battery. What is wrong?


  1. locate the engine cooling fan relay/disconnect/does fan stop
  2. if so reconnect relay
  3. locate fan switch in radiator or intake manifold
  4. disconnect switch/does fan stop?
  5. if so replace switch
  6. if not replace relay
  7. this solution does not check for electrical wiring problems
  8. such as opens or shorts to ground

Jul 27, 2010 | 1994 Honda Accord

2 Answers

I have a 94 Buick Regal Custom with a 3.8 V6 engine I just got a new battery two days ago and yesterday I was driving to work and my car started to overheat when I pulled into work and looked under the...


It may be that the coolant spraying from the open radiator shorted out the electric cooling fan. This would cause overheating even after refilling the antifreeze, and if the short is severe enough, could also drain the battery. Try charging the battery with a plug-in charger overnight, and remove the fuse for the radiator/cooling fan. If it starts up and runs as normal until it begins to heat up, this is probably the case. It would be a good idea to clean the whole engine with degreaser, being careful not to get it in the alternator, and to clean all electrical components with QD contact or electrical cleaner. It could also be a short in the heater fan circuit, but this is less likely. It is more likely that the draw from the heater fan took too much power away from the radiator fan, especially if the battery was marginal due to excess heat or shorting from having gotten very wet. Also, check that the polarity on the battery is correct, just for good measure.

Dec 17, 2009 | 1995 Buick Regal

1 Answer

06 silverado blower fan won`t shut off finally killed battery


The connection at the blower resistor on these model years had problems with poor connections.
The increased resistance on the terminals caused them to heat up and burn. Some would go open circuit and not work at all and some would short to ground and run all the time, like yours.
As you have already discovered, you will need to replace the pieces.

Nov 01, 2009 | 2006 Chevrolet Silverado 1500 2WD

1 Answer

Radiator cooling fans don't turn, car heats up! Where is the switch that turns those fan on? Thanks/Bob


on most cars , there is a temp sensor screwed into the radiator. When the coolant reaches a certain temprature , the contact inside the sensor closes , and completes the circut for the fan relay.
It should have two wire terminals , pull the wires off , and jump the posts with a short piece of wire or metal. Fan should start . ( Keys must be in the run postition , or engine running when you do this. )

If the fan goes , that means the sensor is not working. If the fan does not go , than it's something else. Perhaps the relay , or the fan motor itself is no good.

If your car has A/C , the fans should turn on when the A/C is turned on.

If you start the engine cold , it should not overheat for quite a while.. If it overheats within 5 min of driving , than your thermostat is probly cooked.

Most cars cooling fans do not run most of the time , airflow through the rad while driving is enough.
The fans would only come on while siting still ( idleing ) for a while.

Good luck : let me know how it goes.

May 05, 2009 | 1995 Oldsmobile Ninety Eight

2 Answers

88 Cadillac Deville cooling fan runs continuously


you have a bad fan swtich in the block or the therostat housing its an easy fix

Jan 26, 2009 | 1988 Cadillac Sedan DeVille

2 Answers

Fan is killing battery


seems like the fan relay is stuck if no one has been in messing with wiring

Sep 23, 2008 | 2002 Jaguar X-Type

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