New problem guy's, my climate control doe's everything but turn the fan/blower on to the vents. All the vent switches I press switches to that vent, you can here it, but the fans don't kick on. I pulled both the fuses belonging to the climate control according to the owners manual. any ideas before I get desperate and go to the dealer?

 

This is the EATC system, correct ?

If you manually set the output position, do you hear the vents trying to move, or does nothing happen ?

If you select something like the panel vents, and manually set the fan to high, nothing happens along the way ( stepping the fan speed up ? ).

I am trying to recall if the EATC had the blower motor resistor on it, something is telling me there is not one with the EATC.

Let us know the answers, and one of us should be able to dig up a diagram for the correct system ( EATC or EMTC ).

 

I do not know the difference between EATC and EMTC arent they the same for the 2003 supercrew, but mine reads the temps outside and you can set it at a certain temp. Anyway yes when I switch it from vent to vent you can hear the system change the vents but no air comes out. So i know that the cimae control works to some degree but the fans just won't kick on. Even when I manualy step the fan up nothing happens.

 

The EATC is what you have, set the temp, and the system adjusts the heat ( cooling ) output and fan to obtain and maintain the temp in the cab of the truck. The Manual version, is just that, select where, temp and the fan speed, and it will run there, until it is manually altered.

The manual version has a blower motor resistor on it, to select the speeds, where the EATC does not.

There are a few fuses to check, to make sure things are cool.

BJB Fuse 105 = 40 Amp ( one of those small maxi fuses ). This is the blower motor supply via the blower motor relay
CJB fuse 24 = 10 AMP Hot in Run position ( for the function selector, I would guess this to work, considering you hear the blend door moving )
CJB fuse 5 = 15 AMP Hot in Run position Also functional selector, should be ok ???

The next thing to check is if you are getting voltage to the blower motor. You can check this in the Aux relay block #4, for the blower motor relay, if that is good, the next thing is to check the voltage level from the function selector, to see if the blower motor is being told to operate.

How about we start easy, and take a look at the fuses, and the blower motor relay, rather then you standing on your head trying to get to the power connector for the blower motor ?

 

Found the other 2 posts on the topic, but these were manual systems:

https://www.f150online.com/forums/sh...light=resistor

https://www.f150online.com/forums/sh...hreadid=182977

 

i actually do not have a maxi fuse in slot 105 for some reason, those other two fuses are fine, I pulled each one out. As for the relay, which one is that, under the hood or in the dash?

 

Well, the position selector is vacuum operated, and the temp control works with an electric blending door.
The blower motor resistor might be bad. If you have good fuses try to check power to the blower motor resistor and the motor itself.

 

Sorry, some how I missed your reply 3 days ago.

The fuse in slot 105 should be there, per the 2003 owners manual ( page 183 ), this is the ATM vs ATC type maxi, the little square ones, not the over sized ATC looking maxi fuses.

The blower motor relay is marked as 2 different locations, but the give away is it is in the same block as the indicator flasher relay. It shows center behind the console ( similar to where the power window relays would be under the oval ) and the other location is behind the dash LH side ( I think this is where the flasher relay really is at ).
I won't be near my dad's 01 to check this, so I am sorry to say it is going to be a finsihing trip, unless someone has a picture of where it is at. Turn on the turn signal and try to locate the sound is the best I can offer. There should only be the 2 items in the Aux relay block #4, flasher relay and blower motor relay.

Aux Relay Block 4:


The blower motor resistor is not actually a resistor pack like the XLT & XL's have, so it is still tested to see if the output is at least 10 V in any speed setting, but you won't be able to use an Ohm meter to find out what is wrong with it.
Blower Motor Relay pin out :

 

OK, I know that relay, I pulled it by accident when I replaced my turn signal relay. I replaced it back though so I do not know why it went bad, the right relays are back because I had to upgrade to an LED blinker relay and that works. I will try checking it again although I know it is in their becasue the lid is tightly secured. It's going to the dealer in the morning so I will mention it to them and hopefully I can avoid them checking everything.

 

Got it back from the dealer with the diagnoses; blown blower and Electronic climate control fried to the blower. something like $1200 installed. Weak!