A/C Vents/Vacuum
Lead Driver
Joined: Nov 2013
Posts: 7,174
Likes: 1,174
Two plugs attach to the resistor pack:
1) The plug at the bottom (C602) has three sockets and three wires. It looks like that one is correctly installed.
2) The plug at the top (C604) has two large wires joined at a single socket. That one is not connected, and appears to be the one at the lower left of your picture. To be sure that is the plug, one of those wires has another inline connector (C228, single wire) just a few inches away. The other side of C228 goes into a small corrugated tube that follows the AC line running along the firewall and over to the compressor.
You can see the connectors here:
Try reconnecting C604 (the upper plug) and see if the fan behaves itself now.
Lead Driver
Joined: Nov 2013
Posts: 7,174
Likes: 1,174
Okay here is the question i need answered. There is 2 wires to the blower motor, when i test with the voltmeter one is running 13-14 volts and changing when i flip the speed, and the other one is always reading 12. Where the hell is the ground????? Is the constant 12 shorting out somewhere????
Don't worry about the voltage readings at the moment. Such readings aren't always cut and dry, especially the way current behaves flowing through resistors. See my previous message about the missing connector and see if that helps.
If the fan motor still doesn't seem up to snuff, run this quick test of the ignition switch:
https://www.ford-trucks.com/forums/1...on-switch.html
The fan motor is probably the biggest amp draw through the ignition switch. As the switch gets older, this portion of the switch is the most likely to fail. This test will quickly confirm if it's still okay or not.
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Freshman User
Joined: Apr 2021
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Thanks for the response,
I connected everything like you said and we have working switches and such but, when i put the fan speed to medium i basically feel no air at all at the vents. I hear it running and such but its just really damn soft. I mean maybe it is a bad blower motor but at this point i doubt it. The only other symptom is when i turn on the heat (move the slider to the right) i get absolutely no airflow now, so maybe there is a blade in the way somewhere. The blower motor stil has the stickers on it, and the connectors look perfect and so does the internal motor so i doubt it could've gone bad. I took the motor off once again and all looks good, so yeah the only symptom left is low air speed and no air at all when heater is on.
ALSO- replaced the ignition switch only a couple months back but will check right now (UPDATE) ignition switch is within spec
I connected everything like you said and we have working switches and such but, when i put the fan speed to medium i basically feel no air at all at the vents. I hear it running and such but its just really damn soft. I mean maybe it is a bad blower motor but at this point i doubt it. The only other symptom is when i turn on the heat (move the slider to the right) i get absolutely no airflow now, so maybe there is a blade in the way somewhere. The blower motor stil has the stickers on it, and the connectors look perfect and so does the internal motor so i doubt it could've gone bad. I took the motor off once again and all looks good, so yeah the only symptom left is low air speed and no air at all when heater is on.
ALSO- replaced the ignition switch only a couple months back but will check right now (UPDATE) ignition switch is within spec
Moderator
Joined: Jan 2001
Posts: 56,984
Likes: 2,738
From: Virginia
One other thing to check; If the blower motor is new, it may be turning the wrong way. The last few blower motors I have bought were made for several different applications. So they gave you the wire with the ends and the plastic plug housing, I had to load the plastic housing with the correct polarity so the fan turned the right direction. If you get it wrong it will still blow air, but not as strong as it will running the correct direction. I know how people never seem to read the instructions, even seasoned mechanics. So there is the possibility the fan is turning the wrong direction.
Lead Driver
Joined: Nov 2013
Posts: 7,174
Likes: 1,174
Excellent point. Standing at the front, looking aft towards the firewall, the fan should be turning counterclockwise.
More Turbo
Joined: Oct 2020
Posts: 529
Likes: 54
From: Houston
One other thing to check; If the blower motor is new, it may be turning the wrong way. The last few blower motors I have bought were made for several different applications. So they gave you the wire with the ends and the plastic plug housing, I had to load the plastic housing with the correct polarity so the fan turned the right direction. If you get it wrong it will still blow air, but not as strong as it will running the correct direction. I know how people never seem to read the instructions, even seasoned mechanics. So there is the possibility the fan is turning the wrong direction.
How? Well, I come along and prove they are only idiot resistant.
I reversed the connector which is only meant to go on one way, and SHAZAM!!! It went from flickering a candle to tornado.
Thanks, guys!
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FTE Legend
Joined: Nov 2015
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From: Angier, NC
Thanks for the response,
I connected everything like you said and we have working switches and such but, when i put the fan speed to medium i basically feel no air at all at the vents. I hear it running and such but its just really damn soft. I mean maybe it is a bad blower motor but at this point i doubt it. The only other symptom is when i turn on the heat (move the slider to the right) i get absolutely no airflow now, so maybe there is a blade in the way somewhere. The blower motor stil has the stickers on it, and the connectors look perfect and so does the internal motor so i doubt it could've gone bad. I took the motor off once again and all looks good, so yeah the only symptom left is low air speed and no air at all when heater is on.
ALSO- replaced the ignition switch only a couple months back but will check right now (UPDATE) ignition switch is within spec
I connected everything like you said and we have working switches and such but, when i put the fan speed to medium i basically feel no air at all at the vents. I hear it running and such but its just really damn soft. I mean maybe it is a bad blower motor but at this point i doubt it. The only other symptom is when i turn on the heat (move the slider to the right) i get absolutely no airflow now, so maybe there is a blade in the way somewhere. The blower motor stil has the stickers on it, and the connectors look perfect and so does the internal motor so i doubt it could've gone bad. I took the motor off once again and all looks good, so yeah the only symptom left is low air speed and no air at all when heater is on.
ALSO- replaced the ignition switch only a couple months back but will check right now (UPDATE) ignition switch is within spec
One other thing to check; If the blower motor is new, it may be turning the wrong way. The last few blower motors I have bought were made for several different applications. So they gave you the wire with the ends and the plastic plug housing, I had to load the plastic housing with the correct polarity so the fan turned the right direction. If you get it wrong it will still blow air, but not as strong as it will running the correct direction. I know how people never seem to read the instructions, even seasoned mechanics. So there is the possibility the fan is turning the wrong direction.
Then I see he tested and it is still low on CFM?
Think it is time to pull the dash pad so you can look at the top of the box for any leaks to the duct work.
Dave ----
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Freshman User
Joined: Apr 2021
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Hey Dave, I did that early yesterday and have no leaks. I think its something relating to the fact that i put the heat on and there is no air at all. I have an idea for what to do and ill let everyone know how it goes
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