no temp reading and no e-fan

ocejo · November 12th, 2010, 05:42 PM

I noticed that the temperature gauge does not rise, and the electric fan only runs with the a/c on. Anyone know what controls these two, a search brings up a temp sensor and a temp switch

Cobraman1024 · November 12th, 2010, 07:17 PM

there is also the CCRM which is located very close to the passenger side shock tower in the engine bay.

ocejo · November 12th, 2010, 07:46 PM

you think the module could go bad?

Cobraman1024 · November 12th, 2010, 09:28 PM

the module itself has 3 or 4 relays inside. The relays tend to stick; sometimes giving the box a few good hard taps gets them working again.

OHC230 · November 12th, 2010, 11:47 PM

On the temp gauge, open the hood of your car, standing on the drivers side, look towards the rear of the engine below the oil sending unit you should find the coolant gauge sensor. It should have a single wire attached to it. If you pull that wire off, turn the ignition to the "on position" and the place that wire to ground (any negative voltage source on the car) your temp gauge should move to full hot. If it does, there is a high probability that you need to replace this sensor.

The fan sensor is located on the intake manifold, on the bottom near the center. Pull the wire off the sensor and place it to ground and see if the fan runs. If it does, ther is a high probability that you need to replace this sensor.

ocejo · November 13th, 2010, 05:03 PM

tried the ground to the gauge sensor and no movement

Cobraman1024 · November 13th, 2010, 07:10 PM

Originally Posted by ocejo

tried the ground to the gauge sensor and no movement

I hope you meant that you grounded the plug that attaches to the gauge sensor. If you pull the plug and then ground the sensor itself you won't get anything.

ocejo · November 13th, 2010, 10:14 PM

yes the plug

zonker · November 13th, 2010, 10:51 PM

91-93's don't have a cooling fan switch like the earlier pre-90 mustangs do, theirs is operated thru the engine computer reading the coolant temp sensor (the same one that supplies a signal to the gauge).

the ecu then triggers the relay to send current to the fan.

sooo... if both gauge and fan is fubar (without a/c engagement), i'd say your culprit is either the coolant sensor or the wiring itself.

you already know the CCRM box is good because the fan came on with the AC engagement, so you can rule that out.

ocejo · November 14th, 2010, 01:20 AM

I tried grounding the plug with a tester with a light, that should still get the ground through right

OHC230 · November 14th, 2010, 12:29 PM

Thanks for the correction Rob, I was looking at the 85ish Mustang on Ocejo's avatar when answering his question, didn't read his car description.

Ocejo, I'm going to post a wiring diagram for you to take a look at, so you can trace some wires.

Give me a little time to dig them up.

ocejo · November 15th, 2010, 12:55 AM

thanks

ocejo · January 14th, 2011, 05:04 PM

I'm bringing this thread back now that I have the car running again. Any luck on the diagram OHC230? still no fan or gauge reading......

free2.3 · January 14th, 2011, 06:43 PM

hey i have that schematic in my eec for noobs thread ocejo

free2.3 · January 14th, 2011, 06:48 PM

correction theres no diagram fro the coolant switch on the head only the coolant sensor my bad. but ya replace both sensor in the coolant line and the switch on the back of the head i think both combined is like 25-30 bucks i had the same prob and it was the switch on the head. but i also replaced the 20 year old cts too and my car runs cleaner now

ocejo · January 14th, 2011, 07:04 PM

is there a way to test the switch by the firewall?

free2.3 · January 14th, 2011, 07:07 PM

test the coolant switch on head by grounding the wire going to it with the ign on and theres a sequence of tests for the cts in the heater hose but really that one only effects rich and lean not temp on the gauge

zonker · January 14th, 2011, 07:51 PM

Originally Posted by ocejo

is there a way to test the switch by the firewall?

ohmmeter and a handheld temp reader...

free2.3 · January 14th, 2011, 08:09 PM

ya i know that but its a pain in the ass that way id rather spend 15 bucks and skip that step lol

ocejo · January 14th, 2011, 10:50 PM

I guess I'll just grab a new temp switch

November 12th, 2010, 05:42 PM	#1
ocejo Regular 92 LX 2.3N/A Join Date: May 2010 Location: socal Posts: 215 iTrader: 0 reviews	no temp reading and no e-fan I noticed that the temperature gauge does not rise, and the electric fan only runs with the a/c on. Anyone know what controls these two, a search brings up a temp sensor and a temp switch

November 12th, 2010, 07:17 PM	#2
Cobraman1024 Enthusiast 1995 SVT Cobra Join Date: Nov 2010 Location: Fall River, MA and Juffair, Bahrain Posts: 780 iTrader: 0 reviews	there is also the CCRM which is located very close to the passenger side shock tower in the engine bay. __________________ 1995 SVT Cobra #182/4005, 275/305, 217k miles 1996 SVT Mystic Cobra #1666/2000, 267/263, 178k miles 1995 Mustang, 3.8L, 233k miles 1993 Mustang LX, 2.3L, T5 convert, 95 GT suspension swap, 03 Cobra steering rack, 250k miles sold: 1987 GT MM Military Crew Member MM+Cleavage member #21

November 12th, 2010, 09:28 PM	#4
Cobraman1024 Enthusiast 1995 SVT Cobra Join Date: Nov 2010 Location: Fall River, MA and Juffair, Bahrain Posts: 780 iTrader: 0 reviews	the module itself has 3 or 4 relays inside. The relays tend to stick; sometimes giving the box a few good hard taps gets them working again. __________________ 1995 SVT Cobra #182/4005, 275/305, 217k miles 1996 SVT Mystic Cobra #1666/2000, 267/263, 178k miles 1995 Mustang, 3.8L, 233k miles 1993 Mustang LX, 2.3L, T5 convert, 95 GT suspension swap, 03 Cobra steering rack, 250k miles sold: 1987 GT MM Military Crew Member MM+Cleavage member #21

November 12th, 2010, 11:47 PM	#5
OHC230 Enthusiast Supercharged 89'/ 85' SVO 11.945 @ 119.6 Join Date: Jan 2010 Location: Napa Valley CA Posts: 879 iTrader: 0 reviews	On the temp gauge, open the hood of your car, standing on the drivers side, look towards the rear of the engine below the oil sending unit you should find the coolant gauge sensor. It should have a single wire attached to it. If you pull that wire off, turn the ignition to the "on position" and the place that wire to ground (any negative voltage source on the car) your temp gauge should move to full hot. If it does, there is a high probability that you need to replace this sensor. The fan sensor is located on the intake manifold, on the bottom near the center. Pull the wire off the sensor and place it to ground and see if the fan runs. If it does, ther is a high probability that you need to replace this sensor. __________________ Supercharged 2.7L 398 HP 501 ft lb !!

November 13th, 2010, 10:51 PM	#9
zonker Enthusiast 1991 Mustang LX 2.3 Join Date: Sep 2010 Location: Temecula, CA Posts: 660 iTrader: 0 reviews	91-93's don't have a cooling fan switch like the earlier pre-90 mustangs do, theirs is operated thru the engine computer reading the coolant temp sensor (the same one that supplies a signal to the gauge). the ecu then triggers the relay to send current to the fan. sooo... if both gauge and fan is fubar (without a/c engagement), i'd say your culprit is either the coolant sensor or the wiring itself. you already know the CCRM box is good because the fan came on with the AC engagement, so you can rule that out. __________________ Rob 1987 Mustang 2.3 LX Convert (T5) project 2.5 N/A HP 1991 Mustang 2.3 LX Convert (A4LD) 1992 Mustang 2.3 LX Convert (A4LD) 41.52 mpg!! 1994 Capri XR2 1.6 Turbo Convert 1999 ZX2 S/R 2.0 Coupe http://zxtuner.com

November 12th, 2010, 07:46 PM	#3
ocejo Regular 92 LX 2.3N/A Join Date: May 2010 Location: socal Posts: 215 iTrader: 0 reviews	you think the module could go bad?

November 13th, 2010, 05:03 PM	#6
ocejo Regular 92 LX 2.3N/A Join Date: May 2010 Location: socal Posts: 215 iTrader: 0 reviews	tried the ground to the gauge sensor and no movement

November 13th, 2010, 10:14 PM	#8
ocejo Regular 92 LX 2.3N/A Join Date: May 2010 Location: socal Posts: 215 iTrader: 0 reviews	yes the plug

November 14th, 2010, 01:20 AM	#10
ocejo Regular 92 LX 2.3N/A Join Date: May 2010 Location: socal Posts: 215 iTrader: 0 reviews	I tried grounding the plug with a tester with a light, that should still get the ground through right

November 14th, 2010, 12:29 PM	#11
OHC230 Enthusiast Supercharged 89'/ 85' SVO 11.945 @ 119.6 Join Date: Jan 2010 Location: Napa Valley CA Posts: 879 iTrader: 0 reviews	Thanks for the correction Rob, I was looking at the 85ish Mustang on Ocejo's avatar when answering his question, didn't read his car description. Ocejo, I'm going to post a wiring diagram for you to take a look at, so you can trace some wires. Give me a little time to dig them up. __________________ Supercharged 2.7L 398 HP 501 ft lb !!

November 15th, 2010, 12:55 AM	#12
ocejo Regular 92 LX 2.3N/A Join Date: May 2010 Location: socal Posts: 215 iTrader: 0 reviews	thanks

January 14th, 2011, 05:04 PM	#13
ocejo Regular 92 LX 2.3N/A Join Date: May 2010 Location: socal Posts: 215 iTrader: 0 reviews	I'm bringing this thread back now that I have the car running again. Any luck on the diagram OHC230? still no fan or gauge reading......

January 14th, 2011, 06:43 PM	#14
free2.3 Regular FK UR HONDA Join Date: Jun 2010 Location: the glory hole Posts: 366 iTrader: 0 reviews	hey i have that schematic in my eec for noobs thread ocejo __________________ Nitrous is neat.... Fuel injection is sweet... but at the end of the day i'd rather be blown 91 Mustang hatch(AT) 91 Mustang hatch 2.3T

January 14th, 2011, 06:48 PM	#15
free2.3 Regular FK UR HONDA Join Date: Jun 2010 Location: the glory hole Posts: 366 iTrader: 0 reviews	correction theres no diagram fro the coolant switch on the head only the coolant sensor my bad. but ya replace both sensor in the coolant line and the switch on the back of the head i think both combined is like 25-30 bucks i had the same prob and it was the switch on the head. but i also replaced the 20 year old cts too and my car runs cleaner now __________________ Nitrous is neat.... Fuel injection is sweet... but at the end of the day i'd rather be blown 91 Mustang hatch(AT) 91 Mustang hatch 2.3T

January 14th, 2011, 07:04 PM	#16
ocejo Regular 92 LX 2.3N/A Join Date: May 2010 Location: socal Posts: 215 iTrader: 0 reviews	is there a way to test the switch by the firewall?

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January 14th, 2011, 07:07 PM	#17
free2.3 Regular FK UR HONDA Join Date: Jun 2010 Location: the glory hole Posts: 366 iTrader: 0 reviews	test the coolant switch on head by grounding the wire going to it with the ign on and theres a sequence of tests for the cts in the heater hose but really that one only effects rich and lean not temp on the gauge __________________ Nitrous is neat.... Fuel injection is sweet... but at the end of the day i'd rather be blown 91 Mustang hatch(AT) 91 Mustang hatch 2.3T

January 14th, 2011, 08:09 PM	#19
free2.3 Regular FK UR HONDA Join Date: Jun 2010 Location: the glory hole Posts: 366 iTrader: 0 reviews	ya i know that but its a pain in the ass that way id rather spend 15 bucks and skip that step lol __________________ Nitrous is neat.... Fuel injection is sweet... but at the end of the day i'd rather be blown 91 Mustang hatch(AT) 91 Mustang hatch 2.3T

January 14th, 2011, 10:50 PM	#20
ocejo Regular 92 LX 2.3N/A Join Date: May 2010 Location: socal Posts: 215 iTrader: 0 reviews	I guess I'll just grab a new temp switch

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