TCCoA Forums banner

what is most likely the culprit?

  • ECT sensor

    Votes: 4 57.1%
  • CCRM

    Votes: 3 42.9%
  • PCM

    Votes: 0 0.0%
  • other

    Votes: 0 0.0%

  • Total voters
    7
  • Poll closed .
1 - 11 of 11 Posts

·
Registered
Joined
·
120 Posts
Discussion Starter #1
my electric fan is not cooperating. i can get it to run manually by turning on the heat or the a/c on my climate control system but if i don't, the engine overheats to the point that my red warning light comes on while my fan just sits and watches the engine overheat. i know it isn't the thermostat b/c the upper radiator hose coming from the intake manifold gets hot.

i pulled out my shop manual and after a lot of studying i have narrowed it down to 3 things that could possibly be failing. 1) engine coolant temperature sensor (driver side on intake manifold - not water temperature indicator sender unit on passenger. wti sender reports directly to the gauge on the instrument cluster which is working quite well) 2) constant control relay module or 3) powertrain control module.

any other ideas for what is wrong? and if not, what's the odds on favorite for me to try replacing first?
 

·
Super Moderator
1997 Thunderbird 4.6, 1998 Mark VIII LSC
Joined
·
9,517 Posts
I vote temp sensor for now. Easy to replace if it's bad and it's the first thing in the chain of all the things that actuates the fan. Check the wires to it for shorts too. I'd think that if the CCRM was at fault that using the a/c wouldn't kick the fan on. I also think if the PCM was on its way out there's be other symptoms too, but I could be wrong. If you can find someone with an OBD-II interface you might be able to pull sensor readings to determine what kind of signal the PCM is getting in relation to the temperature.
 

·
Registered
Joined
·
5,978 Posts
i am thinking more than likely the ccrm, it is possible that the ect is bad like posted above, the ccrm is a more a common issue
 

·
Registered
Joined
·
120 Posts
Discussion Starter #4
thanks for the responses guys. i was messing around under the hood while the engine was busy overheating today. i moved around the connecting wire of the ECT and the engine immediately sounded and acted different. i couldn't tell for sure but i think the fan went into its second speed at the same instant and the temperature came back down right after that. so i think i found the problem! (knock on wood) ...

i'll keep you guys posted.
 

·
Super Moderator
Joined
·
11,000 Posts
My wires at the temp sensor had a bad spot; moving the wires would cause it to come on.

They looked like they had been kinked when installed... and opened up under vibration.
 

·
Registered
Joined
·
245 Posts
in my previous 95 TBird, the low side of the fan was bad. Only the high side worked. So the engine had to wait a little longer (build up extra heat so the CCRM could see it) and then startup the high side. Same thing when I turn on the AC. The AC would run for about 15 seconds without the fan, then the high-side came on.
 

·
Registered
Joined
·
150 Posts
I've got a question about this, if you replace a CCRM does it have to match your car, year/engine size?

Mine would not kick over my electric fan at all; I bypassed it all an made a manual switch under my dash. After doing this about 2 years ago I think disconnecting this may be making my car idle rough from time to time.
 

·
Premium Member
Joined
·
5,862 Posts
When I replaced mine, I think the one I replaced it with came out of a Tempo (maybe a Taurus?), it WAS a while ago. But the Ford part # on it was identical, and it has been in my TBird forever with no issues, so I would say no, it doesn't have to come out of the exact same car.
 

·
Registered
Joined
·
245 Posts
I just replaced the fan in my '94 with one from a '97 and it's been running perfectly.
 

·
Newbie
Joined
·
5,650 Posts
The following vehicles share the same CCRM:

FORD ESCORT 1997
FORD ESCORT LX 1997
FORD ESCORT SPORT 1997
FORD MUSTANG COBRA (1994 - 2000)
FORD MUSTANG COBRA SVT 1995
FORD MUSTANG GT (1994 - 2000)
FORD MUSTANG GTS 1995
FORD TAURUS G (1996 - 1997)
FORD TAURUS GL (1996 - 1997)
FORD TAURUS LX (1996 - 1997)
FORD TAURUS SHO (1996 - 1997)
FORD THUNDERBIRD LX (1994 - 1997)
FORD WINDSTAR (1995 - 2002)
MERCURY COUGAR 30TH ANNIVERSARY 1997
MERCURY COUGAR XR-7 (1994 - 1997)
MERCURY SABLE (1996 - 1997)
MERCURY TRACER LS (1997 - 1998)
MERCURY TRACER TRIO (1997 - 1998)
 
1 - 11 of 11 Posts
Top