No heat and winter is here

[bb_becker]

I have a ford explorer 2000 limited it has the Electronic Automatic Temperature Control (EATC)
The fan isn't blowing anything out at any speed I put 12v to the fan and it works fine , the EATC it is working fine (well that's what it looks like) , I think is the blower resistor
Is there some way to check the resistor before I buy a new one?

Also the AC compressor keeps on for a couple of seconds (5 or 6) even when I have the temperature set to 85 is this normal?

 

[1996BLKBauer]

All the Blower Motor Resistor is a bunch of different value resistors, so grab a Digital Multi Meter, and check for continuity. between the input, and output. I am not sure on how the pins are set up. but I also think that BMR are fairly cheap.

 

[bobflood]

EATC doesn't have use a blower resistor; instead it uses something called a "blower motor speed controller" - does the same thing, just works differently and costs more. However, because the blower doesn't work at any speed, check the blower motor relay first. The EATC module puts a ground on the relay to operate it and provide power to the blower motor. Find the relay in the Battery Junction Box and check it out for proper operation. You can simulate it's operation by pulling it from the socket, then jumpering pin 87 to pin 30 in the socket. If the blower motor then works, the relay is probably bad. Good luck.

 

[bb_becker]

OK I bought a new module blower motor speed controller put it on and no results so I make a jump from the relay pin 87 to pin 30 and works so change relays ( took the started relay and swap it for the blower relay ) and doesn't work
I think is a problem with the wiring should I try to jump it on the EATC terminals 16(ignition power) to 17(blower mtr rly gnd)
Also unplug the compressor plug like I said before the AC compressor kicks on for 4 or 5 sec every 3 to 5 minutes I saw water on the compressor do to condensation is this normal? ( no the water if is normal for the compressor to kick on even if I don't have the defrost on )

 

[BigRondo]

OK I bought a new module blower motor speed controller put it on and no results so I make a jump from the relay pin 87 to pin 30 and works so change relays ( took the started relay and swap it for the blower relay ) and doesn't work
I think is a problem with the wiring should I try to jump it on the EATC terminals 16(ignition power) to 17(blower mtr rly gnd)
Also unplug the compressor plug like I said before the AC compressor kicks on for 4 or 5 sec every 3 to 5 minutes I saw water on the compressor do to condensation is this normal? ( no the water if is normal for the compressor to kick on even if I don't have the defrost on )

I will send you the troubleshooting steps from my shop manuals tonight, if I get home early enough. If not, then tomorrow.

 

[bobflood]

OK I bought a new module blower motor speed controller put it on and no results so I make a jump from the relay pin 87 to pin 30 and works so change relays ( took the started relay and swap it for the blower relay ) and doesn't work. This confirms that the fuse and wiring that feeds the blower motor speed control is OK.

I think is a problem with the wiring should I try to jump it on the EATC terminals 16(ignition power) to 17(blower mtr rly gnd). At the relay, see if you have voltage on relay Pin 86 (Key in Run); if not, check fuse #2. Then see if you have ground on relay Pin 85 (Key in Run, EATC turned on); if not, see if you have ground at EATC on Pin 17. If ground at Pin 17, but not Pin 85 - wiring problem between the two points. If no ground at EATC on Pin 17, problem is in EATC unit.

Also unplug the compressor plug like I said before the AC compressor kicks on for 4 or 5 sec every 3 to 5 minutes I saw water on the compressor do to condensation is this normal? ( no the water if is normal for the compressor to kick on even if I don't have the defrost on). The compressor is energized in every mode except Vent and Floor, I believe.

Good luck.

 

[bb_becker]

Ok today at work check the relay put power to it and it work fine
Back from work check continuity Pin17 (EATC) to Pin85 (BMR) and fine
When to check the forum and star to do what Bob said (by the way thanks for ur help Bob)
Pin 86 (BMR) got 14v DC
Pin 85 (BMR) no ground (check with my tester no continuity to the - at the battery)
Unplug and check Pin17 (EATC) no ground (back again check for continuity)
Right now and siting on the car put a piece of wire between Pins 87 and 30 Blower Motor Relay and blower works fine goes fast and slow EATC is working fine (that's what it looks like it) change temp, max a/c, vent, pnl-flr, floor, flr-def, def , fan hi -- lo
Something I see to notice is the EATC is hot (put my hand on it and it is hot) but I just remember it always got hot, Don't think is the EATC well don't want to believe is the EATC and in case is the EATC how can I fix it or were can I fix it

 

[bobflood]

Back from work check continuity Pin17 (EATC) to Pin85 (BMR) and fine. Unplug and check Pin17 (EATC) no ground (back again check for continuity)Right now and siting on the car put a piece of wire between Pins 87 and 30 Blower Motor Relay and blower works fine goes fast and slow EATC is working fine (that's what it looks like it) change temp, max a/c, vent, pnl-flr, floor, flr-def, def , fan hi -- lo
Something I see to notice is the EATC is hot (put my hand on it and it is hot) but I just remember it always got hot, Don't think is the EATC well don't want to believe is the EATC and in case is the EATC how can I fix it or were can I fix it

Sorry bb, but this test indicates that it IS a problem with the EATC. The EATC unit should be putting a ground on that wire when it is turned on. That is what operates the blower relay, which in turn sends power to the blower motor controller to operate the blower. I know there is at least one place here in Atlanta that sells refurbished EATC units for about $100; I have never looked but I suspect that they are also commonly available on-line. Or you can try a unit out of a JY/pull-a-part yard. Unfortunately, I don't know of any source for an EATC schematic to try and figure out a repair. BTW, my EATC unit does not get hot during operation, so I don't think that is normal. Good luck.

 

[BigRondo]

Sorry about the delay in sending the info. I will try my best to get it to you tonight when I get home.

 

[albi1cnobi1]

I have a schematic for the EATC if you need it. Also bob is correct, all your troubleshooting points to a bad EATC unit. I also have a spare unit I would sell cheap if you can't find one locally. The only problem with the unit is that a couple of the buttons bulbs are out. Other than that the unit works fine.

 

[snoranger]

I have a schematic for the EATC if you need it. Also bob is correct, all your troubleshooting points to a bad EATC unit. I also have a spare unit I would sell cheap if you can't find one locally. The only problem with the unit is that a couple of the buttons bulbs are out. Other than that the unit works fine.

Exactly how many of these things did you pull at the JY Al?

I know of 3, so far.

 

[albi1cnobi1]

Lol! No, just 2. This is a spare, that last guy that said he wanted it was supposed to send the funds and I never heard from him again. So maybe someone else can use it.

 

[snoranger]

Lol! No, just 2.

I count 3...
The 1 in your truck.
The 1 you sold me.
And this 1.

 

[albi1cnobi1]

The 1 in my truck is from blueka. I got the whole setup from him. The other 2 I got from my local jy. I just figured I'd grab them before someone else did.

 

[BigRondo]

bb_becker, check your PM.

 

[bb_becker]

albi1cnobi1 can u send me the schematic of the EATC ?

Rondo I just saw u message I will try it tomorrow

I bought a simple switch I was thinking if the problem is ground I will put ground to the blower relay from the battery so can turn on the fan manually this will get me going at least for now what u guys think about this idea

 

[albi1cnobi1]

bb_becker, here's the schematic for the EATC. I included the rear controls as well, so you would have the whole thing.

 

[bobflood]

albi1cnobi1 can u send me the schematic of the EATC ?

Rondo I just saw u message I will try it tomorrow

I bought a simple switch I was thinking if the problem is ground I will put ground to the blower relay from the battery so can turn on the fan manually this will get me going at least for now what u guys think about this idea

Should be no reason why that won't work. I would be tempted to cut the Y/BK wire just outside the EATC connector and wire in your switch to a ground right around there. Minimal wiring necessary and the switch could be right near the EATC. Another thought - do you even need a switch?? Just connect permanently to ground - the "hot" side is only hot when the key is in the Run position so it won't create a drain when the truck is turned off, and I can't remember the last time I turned my EATC unit "off" while using the vehicle.

 

[BigRondo]

bb_becker, check your PM.

Did you check your PM? I sent the diagrams, the connector pinouts, and the troubleshooting steps.

 

[bb_becker]

guys thanks for the help

Rondo I got your message I'm going to printed and take from there today I had to go and get new tires for the truck (600$)

Bod so can I run a wire to the negative side of the battery should that be ok or cut the wire at the EATC and put a switch on the side of the panel (also if U can explain the tern GROUND to me )

Albi thanks for the schematic of the EATC but I thought U mean u had the inside of the EATC so I can fixed

A couple more question for all
Is normal when u touch the EATC to be hot? and
my wheel has controls for the heater, fans, radio and cruise control I took then out because they were bad well not all the temp and velocity of the fan were ok

also if the compressor always is on why now I can heard it and before not?

need to go to sleep thanks for all the help Guys