I have had this problem with my ohc reading the wrong temp ever sence i installed it...Well its got to the point where its not strating to drive me crazy. I was wondering if any one would happen to know why this isnt reading the temp right...Help me get this fixed...Thanx

 

is it reading high or low?

 

Both it read really hot when its hot out and right now its like 47 and its readin that theres ice out and its on being on 6

 

I went through the same exact thing. Never seemed to be a good correlation between actual and OHC temp. First, where did you mount the temp probe?

 

I have it mounted under the cab of the truck

 

did you hook up the wire that went to that box behind the CD player to help with the temp control..

i had mine under the truck and it was wacked..so i put mine behind the grill and works fine..

 

the sensor needs to be behind the grille or one of the headlights and you need to hook up the VSS wire on the GEM in the dash to get accurate temp readings

 

Where at under the cab? I would mount it in front of the engine... you'd be suprised how airflow can pick up heat from the engine. I mounted mine under the driver side headlight. There is a hole there that it cliped in nicely.

Once you get it in a position that gives a stable reading, then we can see if it's reading right. (Mine wasn't and needed a new sensor.)

 

it needs to be behind the grill.

and the VSS sensor needs to be hooked up as well. otherwise it wont work well

 

I get readings like "-6*F ICE" only when it is warm out and has had sun beating down on the windshield for a few hours, the vss wire is hooked up- sensor is behind grille. Other than that, works perfectly.

 

i have all the wires hooked up the way they should be...maybe i ll go through all the wireing or something to see if maybe i have a bad connection....the sensor is mounted in a area where it wouldnt get any kind of heat or anything...i bought the sensor new from the dealer ship over a year ago...so it cant be bad...cause it always read wrong....hmm i dont know...

 

so you think, why not mount it where Ford mounts it on the Explorers? seems like the correct thing to do, that is where everyone else mounts theirs!

 

and the hole is already drilled out for you making that much easier!

 

I made the same mistake of thinking there was no ambient heat affecting where I mounted mine (mounted behind the front grill piece, in front of the radiator.) I was reading 100F on a 40F day. Moved it below the headlight, then I saw a constant temperature, which was low. (~40 deg. too low). After trying two different sensors (one that came with it and one from a JY), I ordered one from RockAuto. Had to sand the sensor so it would fit in the socket (boy was THAT a fiasco... there's at least 3 different harnesses out there), then got it working.

Other things to check that I can think of... is the console getting proper current? Check and make sure you are getting a good 12V at the OHC. A lower voltage could cause a low temperature reading. Make sure all your connections are good (I soldered mine, then electrical taped the wires to insulate them).

Another thought... check your OHC by wiring a 30Kohm resistor in place of the temperature sensor. You should read ~65F. If that's way off, perhaps your OHC is fubar'd.

 

There's only one sensor, and it HAS to be the one with the blue wires on it.

It sounds like a wiring fault or bad sensor or bad OHC, in order of likelihood.

If you want to try something, get a resistor from radio shack, 10K ohms (1/4 watt or 1/2 watt doesn't matter) and splice it in in place of the sensor.

You should read a constant temperature I think around 60 degrees or so. If you don't, or the temperature is way, way out there, then you have a problem in your wiring or OHC. If the temp is consistent, then the problem was your sensor.

 

Oops, must've goofed testing the sensor way back when. 30Kohm is the EATC sensor, no? (10Kohm for OHC, yes?)

 

Absolutely! Good memory!

Those are the resistance somewhere in the vicinity of 60 to 70 F. Never measured it exactly.

 

Hey, did you ever get it working?