SHO climate control

[BBsPG4]

I noticed that suddenly my climate control is freaking out. It snowed and became very cold and now my climate control is not working properly. It still blows hot and cold air so the temp. works but the high low air output will not work right and also when I turn the climate control completly off the defrost then turns on and starts blowing. Also when I press the panel/floor option another option will work instead like floor/defost. so my question is, does the weather play a part and temporarily make it bug out, or do I need another climate control unit, or is it a blown fuse, or is there a bigger problem. FYI I have a 93 ATX. please reply or email at [email protected]

 

[SHO SPD]

I just piced up my 93 ATX today, and it has the EXACT same problem... its like 20 degrees here, so maybe it is temp..I dunno, I have yet to be in warm weather with it...anyone have any ideas?

 

[Tooles]

Try this (posted from shotimes.com):

ELECTRONIC CLIMATE CONTROL - SELF DIAGNOSTIC TEST

The control assembly will detect electrical malfunctions occurring during the self test.

1. Make sure the coolant temperature is at least 120F (49C).

2. To display error codes, push the OFF and FLOOR buttons simultaneously and then the AUTOMATIC button within 2 seconds. The test may run as long as 20 seconds, during which time the display will be blank. If the display is blank for more than 20 seconds, consult the No Error Code Found Diagnosis and Testing chart.

3. The Self Diagnostic Test can be initiated at any time with the resulting error codes being displayed. Normal operation of the system stops when the Self Diagnostic Test is activated. To exit the self test and restart the system, push the COOLER button. The self test should be deactivated before powering the system down.

ERROR CODE KEY

Code Condition

1.. Replace control head
2.. Blend door problem
3.. In-car temp sensor open or short
4.. Ambient temp sensor open or short
5.. Sunload sensor short
6.. 888 Test complete - no failures (all segments on)

Hopefully that will get you started in the right direction - or maybe it's just too freaking cold outside! My EATC is acting up also - I haven't figured it out yet.
Mike, 95 ATX

 

[AutoXSHO]

All of these problems are a result of a bad blower control module. If I ever get the modules I was promised from people on the board, I'll do a write-up. So far I've been waiting and haven't seen anything, though.

John V

 

[SHO SPD]

Auto X SHO.... will the module from an 89 SHO work on my 93??? If not, I am just going to use the directions you gave me.. Thanks a-lot for that BTW

<small>[ March 05, 2002, 08:14 AM: Message edited by: SHO SPD ]</small>

 

[AutoXSHO]

I don't know. The only '89s I've seen have the old-style EEC, and I don't think that blower control module will work.

Good luck with the repairs.

John V

 

[BBsPG4]

I ran the diagnostic test for the climate control. After 18 seconds of the screen being blank it lite up with every option available. It showed 888 degrees and every other light that is available on the screen showed up all at once. I don't know what that means. Could someone please help. My guess is that it is the blower control module, where is this part located, what kind of job am I taking on if it is it, how much will it run me, etc.? Please help. thank you

 

[djsSHO]

888 means everything is OK

 

[AutoXSHO]

888 means that the systems that the self-test covers are all within spec. The blower control module is not included in this test.

The blower control module is easy to fix if you have a fair amount of experience repairing surface mount electronics. It's located in the heating duct behind the glove box and has a sticker with its name written on it.

It is somewhat time consuming to repair and not necessarily straightforward. I am still looking for loaner units to repair so I can do a web page on repairing the common problems with the BCM.

JV

<small>[ March 12, 2002, 08:41 AM: Message edited by: AutoXSHO ]</small>

 

[MysticSHO]

I am having kinda od the same problem i have changed my climate control unit ,when i hit the off button the blower motor cotinues to blow air and will not shut off and sometimes the motor will sound likes it struggling to blow on and off but i need to shut this thing off i have been driving for the past 5k miles with this blower motor on all the time can it be the Blowwer controle module thanks for any help

chris

 

[BBsPG4]

So that is what it looks like, the blower control module. So do I need to take out the whole dash to get to the thing or is there an easier way. Like just take out the glove box to get to it? I would love to do this project myself so I would like to know everything there is to know from people that have done this project. Please let me know.

 

[AutoXSHO]

Okay.

The BCM is easy to get to. It is held into the heater core piping with two screws. It also has some sort of ventilation hose going to it.

The two screws come out and the BCM comes out. Piece of cake. It's right behind the glovebox.

I have fixed a couple. The main problem is PCB corrosion due to humidity in the air. Run those A/C systems! Ford put the thing in the ventilation ducts for cooling reasons - works great until it rains.

When you pull it out you can separate the large heat sink area from the circuitboard. Now you can clearly see the electronics. One side of the board is made up of SMT resistors and capacitors. I have a schematic of the BCM with the resistor values labeled. The capacitor values I don't have, but you should be able to judge values within an order of magnitude from their physical size.

My repair consists of a thorough cleaning and then replacement of bad traces. Then a component check and replacement if necessary.

I recently got one from a TechSHO list member that was clicking. This one physically blew the relay module. D'oh!

If you wait a week I'll have detailed pictures and instructions on this topic.

John V