climate control mod:

[pdaddy05]

I"ve been in germany for three years and my 98 sho have been sitting at my brothers house since then,what is wrong with my A/C and heater control.The A/C just blows air,it'sfull of freon. The heater just blows too, no matter what temp Iput it on it just blows the same! where can I get this checked out or get it fix and how much.

 

[SHOWHAT9]

I"ve been in germany for three years and my 98 sho have been sitting at my brothers house since then,what is wrong with my A/C and heater control.The A/C just blows air,it'sfull of freon. The heater just blows too, no matter what temp Iput it on it just blows the same! where can I get this checked out or get it fix and how much.

EATC SELF DIAGNOSTIC
First have it tell you what it thinks is wrong. Perform the self test as described on V8sho.com above and report the findings back.

 

[stephen newberg]

Larry, does anything in the EATC Sefl Diagnostic cover calibration for the temperature read out? A few weeks ago mine started reading high for the outside temp by about 3 degrees C. It is interesting to watch, since if you let the car sit for a day in the shade, so it is completely at ambient temps, when you first turn it on, it flashes to the correct outside temp (say, 4C), and then even if you are driving fast and running a fair amount of air by, it drops rapidly off to 3 degrees less, and then stabilizes. From there on, it shows relative changes just fine, always off by 3 degrees C.

Also, if you know, is there any way to reset this via calibration?

pax, smn

 

[SHOWHAT9]

Larry, does anything in the EATC Sefl Diagnostic cover calibration for the temperature read out? A few weeks ago mine started reading high for the outside temp by about 3 degrees C. It is interesting to watch, since if you let the car sit for a day in the shade, so it is completely at ambient temps, when you first turn it on, it flashes to the correct outside temp (say, 4C), and then even if you are driving fast and running a fair amount of air by, it drops rapidly off to 3 degrees less, and then stabilizes. From there on, it shows relative changes just fine, always off by 3 degrees C.

Also, if you know, is there any way to reset this via calibration?

pax, smn

Canadian air? (J/K) let me do some research, or perhaps Paul already knows from the CD?

 

[SHOZ123]

The temp sensors (IAT,ECT, and outside air) are all just a normal RTD type sensors. As the temp changes so does the resistance. As the temp goes up the resistance lessens. There is no way to calibrate short of adding a resistor. If the readout is good then goes bad I would think this is pointing to the EATC circuity in the football. You could try a different sensor.

 

[SilverStreak]

My outside temp guage has been off by +3 degrees since I got the car, fwiw. I just accepted it as a "feature", not a bug.

Ford apparently wanted to force me to do math. Bastards.

 

[stephen newberg]

"Feature", eh?

Thanks for the data Paul, that was my guess but I have never gotten around to getting a copy of the SHO CD, which I guess I should, so I could not look at it directly. If I might ask one more question on this, where is the outside air temp sensor located? I can then do a resistance check on it based on your chart, though considering the values it indicates, and the likely outside air temp values, it is very possible that it is a different sensor resistor with different numbers, I would guess. From what you say, I think it most likely you are right and something gone wrong in the EATC circuitry is the root of the problem.

pax, smn

 

[SHOZ123]

You can access the outside temp sender wiring from the Remote Climate Control module. This is located behind the glove box on the left end. The Red and Orange wire is the input from the sensor. The Pink and Black wire is the signal return. Measure with an ohm meter between these two points and compare the numbers to the chart and a know good thermometer. Mine has always been dead on. I am sure the ambient air temp sensor values are the same as all the other 2 wire temperature input sensors in the engine system.

 

[stephen newberg]

Thanks Paul, that is great. I will give it a try tomorrow, if the temp gets up to the range of the values, but I note that a +10 is not all that likely.

I can do a regression on it all and extrapolate the lower temp resistances, and it will probably be right.

pax, smn

 

[pdaddy05]

I"ve tried the self test and nothing happen,it just showed the temp and where it was blowing.