Cooling fans

Tiny
ESNIPES
  • 1996 CHRYSLER TOWN AND COUNTRY

Today I replaced air filter and some vaccum lines, The cooling fans come on and will not go off unless I turn car off, The temp Gage is not moving off cold either. I got to looking and found a ground wire that was not connected, So We connected it and then it turned into a hot wire. Fans went off when started, One fan runs when turn air on, The temp Gage does not move still. So car is not getting warm enough for other fan to kick on. I need help with this problem asap. Someone told me the temp sensor is ground. But I have no idea what that means. Please help

Do you
have the same problem?
Yes
No
Monday, September 19th, 2011 AT 3:53 AM

18 Replies

Tiny
PROMECHANIC
  • EXPERT
  • 550 POSTS

I would suspect the coolant temperature sensor (CTS). This sensor tells the cars computer how hot the coolant is so it can turn the cooling fans on when it needs to.
If the sensor is not working correctly you would have a gauge that does not work and the fans would not work correctly either.

Was this
answer
helpful?
Yes
No
Monday, September 19th, 2011 AT 4:00 AM
Tiny
ESNIPES
  • MEMBER

So replace the CTS? On fixya they said it sounds like temp sensor is grounded what does that mean, They are not answering me.

Was this
answer
helpful?
Yes
No
Monday, September 19th, 2011 AT 4:02 AM
Tiny
PROMECHANIC
  • EXPERT
  • 550 POSTS

I would check it out first. See if it is just disconnected or something.
If the sensor is grounded it just means that the wire that goes to the sensor is touching a ground (a metal part on the engine or another wire) and not getting a good connection to the sensor.

Was this
answer
helpful?
Yes
No
Please consider a donation if we helped you
Monday, September 19th, 2011 AT 4:05 AM
Tiny
ESNIPES
  • MEMBER

Could you please help me locate the cts? :) I am sorry ladys just think they know it all but really I do not :)

Was this
answer
helpful?
Yes
No
Monday, September 19th, 2011 AT 4:09 AM
Tiny
ESNIPES
  • MEMBER

Thanks for all your help, Ill take it to someone who can maybe fix it or figure it out. The dummy I have trying to work on it is the one who messed it up to begin with. Thanks a lot for your help.

Was this
answer
helpful?
Yes
No
Monday, September 19th, 2011 AT 4:28 AM
Tiny
RIVERMIKERAT
  • MEMBER

On the 2.4L engine, the CTS is located on the thermostat housing.
On the 3.0L it is near the distributor.
On the 3.3L and 3.8L engines, it is next to the thermostat housing.
Use a cooling system thermometer to check how hot the coolant in the radiator is getting. Also look into the opening to make sure the coolant is flowing when the engine warms up. The coolant temperature should be between 180 and 200 degrees after driving for a little while.

Was this
answer
helpful?
Yes
No
Wednesday, September 21st, 2011 AT 5:21 AM
Tiny
ESNIPES
  • MEMBER

I changed the temp sensor, Fans still running while car is on. I also changed relay as well. So I have no idea what the heck is going on.

Was this
answer
helpful?
Yes
No
Thursday, September 22nd, 2011 AT 4:20 PM
Tiny
RIVERMIKERAT
  • MEMBER

The cooling fans are designed to run when the engine is on and at operating temperature. Using a cooling system thermometer, check to ensure that the coolant is circulating throughout the cooling system. If so, you don't seem to have an issue with the cooling system.

Was this
answer
helpful?
Yes
No
Friday, September 23rd, 2011 AT 9:51 PM
Tiny
ESNIPES
  • MEMBER

Its not showing signs of over heating, I just can not figure out why the fans are running the whole time the car is on. The temp gage will not even move from cold

Was this
answer
helpful?
Yes
No
Saturday, September 24th, 2011 AT 3:46 AM
Tiny
RIVERMIKERAT
  • MEMBER

You either have a problem with the temperature sensor or the ECM if the cooling fan is on even when the engine is first started. Make sure the AC is switched off as it will cause the fans to run continuously, even with the engine cold.

Was this
answer
helpful?
Yes
No
Sunday, September 25th, 2011 AT 2:32 AM
Tiny
ESNIPES
  • MEMBER

I have changed the temp sensor already, The air is switched to off at all times. I have tried everything right down to relay and new battery things lol Sorry I am a women with no income so kinda hard to take to a shop. Its a fix it your self or just drive as is

Was this
answer
helpful?
Yes
No
Wednesday, September 28th, 2011 AT 3:09 AM
Tiny
RIVERMIKERAT
  • MEMBER

I'm at a loss here. As long as the relay and temp sensor are operating properly, the fan should only be switched on when the engine reaches just over normal operating temperature.

Was this
answer
helpful?
Yes
No
Wednesday, September 28th, 2011 AT 3:46 AM
Tiny
ESNIPES
  • MEMBER

That's what I was thinking as well. But I have replaced both parts. I have no idea what is going on under that hood.

Was this
answer
helpful?
Yes
No
Wednesday, September 28th, 2011 AT 10:03 AM
Tiny
RIVERMIKERAT
  • MEMBER

Is this something that's just recently begun to happen, or has it been going on for awhile?

Was this
answer
helpful?
Yes
No
Thursday, September 29th, 2011 AT 2:22 AM
Tiny
ESNIPES
  • MEMBER

Just Recently started, I changed the air filter and some vaccum lines and then it started right after I changed the last vaccum line to the motor. Should have no made a change in my fan running. But It kicked on and now it does not shut off unless I turn car off. I also changed the map sensor, Because my car is shutting off at any giving moment, I done some research on here and someone told me to change the map sensor. But did not help. So now Ill change the gas filter. But the fan. Yeah just started

Was this
answer
helpful?
Yes
No
Thursday, September 29th, 2011 AT 6:39 AM
Tiny
RIVERMIKERAT
  • MEMBER

These 2 issues together make me think ECU problem.

Was this
answer
helpful?
Yes
No
Thursday, September 29th, 2011 AT 6:46 AM
Tiny
ESNIPES
  • MEMBER

What is ECU? And how do I solve the issue?

Was this
answer
helpful?
Yes
No
Thursday, September 29th, 2011 AT 1:41 PM
Tiny
RIVERMIKERAT
  • MEMBER

Electronic Control Unit: The Computer. A defective computer must be replaced to fix the problem. Usually you can find them at junkyards for fairly cheap. If you go that way, make sure either that it works or that you have the ability to trade it in for another one.

Personally, unless the fan(s) won't turn off with the engine/key off, I wouldn't worry about it much. Yes, it causes the engine to take a little longer to warm up, but it really isn't going to do any real damage to the engine or electrical system.

Was this
answer
helpful?
Yes
No
Thursday, September 29th, 2011 AT 7:40 PM

Please login or register to post a reply.

Related Fan Stays On Questions

Recommended articles