AC troubleshooting help.
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Joined: Sep 2012
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AC troubleshooting help.
Hi ya'll, I'm new to the forum and glad to be here. I own a 85 6.9L f250 I have a problem with my ac blower that will not come on anymore. Checked heater fuse where there were some signs of heat as in slightly melted fuse, but was not blown. I have power at the blower switch when ac is on, but when I turn the fan on nothing. I have jumped the fan direct with 12v power and it works fine. The ac controller also turns on the compressor normally. I thought it might be the resistor and was wrong on that. I set up the fan, resistor, blower switch on my bench and wired it all up to 12v and works great on all switch settings. Could it be the ac controller, a short circuit at the fuse box? I'll run direct power to the ac controller next and see if it works. Any ideas or thoughts would be big help. Thank you.
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Thanks for the reply.
Well now, the motor doesn't go right to ground at the motor, the ac controller enegizes the hot leg of the motor when in the norm/max position, then depending on blower switch either through resistor back through the firewall to a ground in the dash. If blower switch is on high it goes back through firewall direct to the same location. I checked the ground at the location and on the start point of the ground wire w/12v and it works. Thanks again for your help.
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