Ford Ranger Forum - Forums for Ford Ranger enthusiasts!

Go Back   Ford Ranger Forum - Forums for Ford Ranger enthusiasts! > >
Forgot Password? Join Us!

Welcome to Ford Ranger Forum

Reply
 
Thread Tools Search this Thread

  #1  
Old 01-01-2011, 11:26 AM
RangerRick02 RangerRick02 is offline
Learning to use the forums
 
Join Date: Jan 2011
Posts: 8
Default Over heating and gage shows Normal?

My truck has 75k miles, 2wd, auto, it goes to work and back and thats it. The drive to work is about 6-7 miles one way and the truck will over heat in that time period.
I initially thought the thermostat was faulty and spent the mega millions required to buy one (Thank you Ford!) only to find out it's not the problem. The engine heats up fine, but the lower radiator hose is always cold. This means new or not the thermostat is not opening.
Now because Ford engineered this wonderful POS for a thermostat to require some type of electrical necessity you cant test the thermostat in hot water to see if it will open, it must have some type of electrical signal. Thus my quandary.
This problem sets off a CEL and I can't get plates because....I can't pass emissions with a CEL.
All because of a simple thermostat and Fords wonderful engineering!

Everything has been tested, no head gasket leaks, no burning of coolant, no coolant leaks, just overheating due to the thermostat or electronics.

Is there an electrical schematic for 2002-2xxx Rangers I can browse. Ive spent a small fortune diagnosing this, less than the stealer wanted ($500, cause they want to replace the thermostat ($207) the rest is labor, and it takes all of 15 minutes to replace). From that its painfully obvious the stealer has no clue whats wrong.

Hope you had a good New Year.

Edit:
CEL is P1432
Thermostat Heater Control Circuit Failure

Edit 2:
I am running on a modified thermostat that allows the coolant to flow freely, no overheating at all and barely any temperature (150sih).

----------

I found in another post there is some type of "electronic body module" but no one replied what or where it is.
low temp on gauge,2.3 engine 2002
__________________
Regards

Rick
2002 Ranger (Base)
2.3, 2wd, auto

Last edited by RangerRick02; 01-01-2011 at 11:40 AM.
Reply With Quote
  #2  
Old 01-01-2011, 11:28 AM
pooleo pooleo is offline
Ban Survivor. (x2)
 
Join Date: Jun 2010
Posts: 6,764
Default Re: Over heating and gage shows Normal?

try taking the thermostat out and see if it still over heats, if it does, thermostat is not your problem. Perhaps your radiator is plugged/blocked
__________________
1999 | Ext. Cab | 4.0 | 4x4 | 4.10's
Quote:
A Gladiator does not fear death. He embraces it. Caresses it. Fucks it. Each time he enters the arena, he slips his c0ck in the mouth of the beast, and prays to thrust home before the jaws snap shut. - Oenomaus
Ball Joints/Upper A-Arms How To
Replace Door pin/bushing
Repair broken dome light tabs
VIDEO OHC Install
Reply With Quote
  #3  
Old 01-01-2011, 11:39 AM
RangerRick02 RangerRick02 is offline
Learning to use the forums
 
Join Date: Jan 2011
Posts: 8
Default Re: Over heating and gage shows Normal?

I'm afraid I didn't mention that in my initial post, its how I drive it now.

Since this is the "special" thermostat, I fixed it to flow open, assuming it was defective (that assumption is probably wrong). It never gets warm right now.

I have a brand new thermostat assembly now, installed it and it over heated as usual. This is why I think its electrical (Thermostat Heater Control Circuit Failure).
Are there any schematics online?
__________________
Regards

Rick
2002 Ranger (Base)
2.3, 2wd, auto

Last edited by RangerRick02; 01-01-2011 at 11:42 AM.
Reply With Quote
  #4  
Old 01-02-2011, 06:26 AM
TenSilver TenSilver is offline
The Old Man
 
Join Date: Sep 2010
Posts: 1,066
Default Re: Over heating and gage shows Normal?

Does this help?


PM sent.
__________________
2010 Silver Ford Ranger XLT 2.3L 2WD StyleSide Reg Cab Auto, Open 7.5" - 4.10 diff.
TruxEdo tonneua cover, rubber bed mat, Ranger all weather floor mats.
Reply With Quote
  #5  
Old 01-02-2011, 10:47 AM
RangerRick02 RangerRick02 is offline
Learning to use the forums
 
Join Date: Jan 2011
Posts: 8
Default Re: Over heating and gage shows Normal?

It helps and it doesn't help.
Now I know the wiring layout but I still do not know what voltage range the thermostat sensor should see.
And I do not understand how the sensor controls the actual thermostat. Like I mentioned before, I can stick one of these assemblies in boiling water and the thermostat will not open.
__________________
Regards

Rick
2002 Ranger (Base)
2.3, 2wd, auto
Reply With Quote
  #6  
Old 01-02-2011, 05:52 PM
TenSilver TenSilver is offline
The Old Man
 
Join Date: Sep 2010
Posts: 1,066
Default Re: Over heating and gage shows Normal?

Bummer! I didn't know if it would help or not.
The info you are looking for maybe in the Ford service manual.
__________________
2010 Silver Ford Ranger XLT 2.3L 2WD StyleSide Reg Cab Auto, Open 7.5" - 4.10 diff.
TruxEdo tonneua cover, rubber bed mat, Ranger all weather floor mats.
Reply With Quote
  #7  
Old 01-03-2011, 12:42 AM
S13minus1 S13minus1 is offline
Sideways? Sideways.
 
Join Date: Jun 2010
Posts: 1,592
Send a message via AIM to S13minus1
Default Re: Over heating and gage shows Normal?

according to that diagram its a thermistor, total voltage range should be 0-5v, normal voltage should be ~.5-4.5v. i'd check continuity of the wires from the pcm to the electronic thermo, and make sure the pcm is in reality putting out the 5v.

now why it has a termistor, im not sure. that seems strange. id expect it to be a simple 12v solenoid.
__________________
-Alex
'10 Ranger XL 2.3L Manual
Mods: Stereo, Tint, Weatherguard rain shields, Intake silencer removal, LED brake, turn signal, reverse, license plate, and dome lights, DDM HID's (currently removed), lowered, 17" wheels with spacers, Explorer autodim mirror with Autolamps, Magnaflow exhaust, Buggman LED 3rd Brake Light...
Quote:
Originally Posted by ColinS View Post
awe come on alex be a man!
Reply With Quote
  #8  
Old 01-03-2011, 01:53 PM
RangerRick02 RangerRick02 is offline
Learning to use the forums
 
Join Date: Jan 2011
Posts: 8
Default Re: Over heating and gage shows Normal?

Thanks S13minus1
I just found this information which oddly is not the same as yours (voltage only).
Quote:

Some vehicle applications (2.3L Ranger) use an electric thermostat heater. These vehicles use a high temperature thermostat (220oF versus 192oF) to achieve faster warm-up times. The heater circuit can be energized by the PCM whenever additional cooling is required. (The PCM energizes the heater based primarily on ECT/CHT, but can allow for additional cooling based on inputs from rpm, load, IAT and TFT.) The heat generated by the heater causes the thermostat to open at a lower temperature than the rated temperature of the thermostat (up to 50oF lower), thereby, providing additional engine and transmission cooling. The PCM duty cycles the heater output at 100% to open the open the thermostat, 70% to keep it open and 0% to provided rated thermostat function. The PCM monitors the "smart" driver fault status bit that indicates either an open circuit, short to power or short to ground. If the heater circuit fails such that it is always off, the vehicle can run hotter than normal. If the heater fails such that it is always on, the vehicle may also fail the thermostat test (P0125/P0128).

Thermostat Heater Check Operation:
DTCs P1432 or P0597 (opens/shorts)
Monitor execution Continuous at 0 and 100% dutycycle
Monitor Sequence None
Monitoring Duration 5 seconds

Typical thermostat heater check entry conditions:
Entry Condition Minimum Maximum
Battery Voltage 11.0 volt
Source: (See pg 66 of 95)
http://www.motorcraftservice.com/vdi...f/obdsm307.pdf

Now, which one is true.
__________________
Regards

Rick
2002 Ranger (Base)
2.3, 2wd, auto
Reply With Quote
  #9  
Old 01-09-2011, 08:29 PM
rwenzing rwenzing is offline
Some assembly required...
 
Join Date: Jun 2009
Posts: 890
Default Re: Over heating and gage shows Normal?

Quote:
according to that diagram its a thermistor, total voltage range should be 0-5v, normal voltage should be ~.5-4.5v.
The PCM does not supply the hot side of the thermostat heater. That comes from fuse 41 and is at charging system voltage (approximately 12~14v).

Based on input from the Cylinder Head Temp sensor, the PCM can duty cycle the ground side to make the heater active which raises the temp of the t-stat and makes it open at lower coolant temp than it would without the heater. It appears that your t-stat heater might not be working at all and that's why the engine is overheating.

I would troubleshoot as follows:

- With the key on, there should be roughly 12~14v on the Light Blue/Orange at the t-stat connector. If not, check fuse 41 and continuity on the wire.

- Resistance through the heater with the connector unplugged should be 14~16 ohms.

- With everything connected normally, monitor voltage on the Dark Blue wire. With a cold engine, there should be about 12~14v present. If not, find out where the open is.

- When the engine gets hot, the PCM should activate the t-stat heater and the voltage on the Dark Blue should drop to significantly less than system voltage. If not, then it is either an open between the t-stat heater and the PCM or the PCM isn't providing ground.
__________________
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles

2003 XLT 2.3L M5OD-R1 reg cab, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid

Last edited by rwenzing; 01-09-2011 at 08:37 PM.
Reply With Quote
  #10  
Old 11-19-2014, 06:23 PM
Chabot1987 Chabot1987 is offline
Like the Forums
 
Join Date: Nov 2014
Posts: 39
Default Re: Over heating and gage shows Normal?

Has any one found a fix for this? I replaced the thermostat and cleared the code P1432. Havnt driven the truck yet but the code came right back. I'd hate to do some serious damage to my new to me truck.
Reply With Quote
  #11  
Old 12-31-2015, 07:14 PM
Coybus Coybus is offline
Liking the Ford Ranger Forum
 
Join Date: Dec 2015
Posts: 22
Default

Quote:
Originally Posted by Chabot1987 View Post
Has any one found a fix for this? I replaced the thermostat and cleared the code P1432. Havnt driven the truck yet but the code came right back. I'd hate to do some serious damage to my new to me truck.
Mine was bubbling out. Bought a new cap and it worked (common problem is faulty cap). I have read some post talking about cracks in the reservoir. If it gets air in the cooling system it boils faster. My only problem is the lower radiator hose staying cold all of the time.
Reply With Quote
  #12  
Old 01-02-2016, 10:53 PM
GSF1200S GSF1200S is offline
Wrist Twister
 
Join Date: Jun 2012
Posts: 990
Default Re: Over heating and gage shows Normal?

Quote:
Originally Posted by Coybus View Post
Mine was bubbling out. Bought a new cap and it worked (common problem is faulty cap). I have read some post talking about cracks in the reservoir. If it gets air in the cooling system it boils faster. My only problem is the lower radiator hose staying cold all of the time.
Holy thread revival batman! This thread is a case study in necromancy..

Since you posted though, and I just went through hell with my 02, I figured id add this next part for anyone stumbling upon this thread with google:

This thermostat sucks, and dont waste your time or money trying to get it working right. It wont. At least not for all of us. Its a failed design and Ford realized this when they switched to a conventional style in 2004.

For more information, see this thread:
Duratec cooling mods -- Need to clear CEL
__________________
2002 Ford Ranger XLT Supercab, 2.3L Duratec I4, 5-speed manual, 4.10 gears, ~100,000 miles
Power nothing with air conditioning; crank windows for life!
Throttle cable mod, retained accessory power mod, 2006 thermostat w/resistor mod
Headlight relay harness, Philips xtreme-vision bulbs
P235/75R15 Michelin LTX M/S2s
Reply With Quote
  #13  
Old 01-04-2016, 07:41 PM
Coybus Coybus is offline
Liking the Ford Ranger Forum
 
Join Date: Dec 2015
Posts: 22
Default

Quote:
Originally Posted by GSF1200S View Post

Holy thread revival batman! This thread is a case study in necromancy..

Since you posted though, and I just went through hell with my 02, I figured id add this next part for anyone stumbling upon this thread with google:

This thermostat sucks, and dont waste your time or money trying to get it working right. It wont. At least not for all of us. Its a failed design and Ford realized this when they switched to a conventional style in 2004.

For more information, see this thread:
Duratec cooling mods -- Need to clear CEL
Sounds like a major flaw by Ford! Just hoping mine holds up.
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Gauge Shows Overheating '95 2.3L Jonno 4-Cylinder Tech 0 11-15-2010 03:22 PM
Oil Pressure Gage indicates zero Galazza 4.0 SOHC / 4.0 OHV Tech 14 10-20-2010 09:52 PM
gage cluster ljones Interior Tech 0 10-08-2010 05:43 PM
What ever happened to real kids shows Magnus Music/Movies/Computers/etc. 7 06-24-2010 11:23 AM
2010 Pa Auto shows 100+ pics NO 56k Downey General Ford Ranger Discussion 8 01-31-2010 11:39 PM