Heater Blower
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Joined: Oct 2015
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Heater Blower
'77 F100 Ranger. The blower was previously working. I had some work done and now it is not. I can hear the vent opening and closing as I move the controls on the dash. There is a little trickle of hot air through the vents. So I'm fairly sure the blower is the problem. (It has factory A/C. Although that is not working at the moment either. Needs new compressor.)
So, where do I start? Blower Motor Relay?
So, where do I start? Blower Motor Relay?
Fleet Mechanic
Joined: Nov 2009
Posts: 1,398
Likes: 6
Since this was the work done, check to make sure that switch harness connector did not come loose. Under normal conditions, check easy stuff like fuse, relay etc. If those are found to be working, start from switch and work your way out. Sometimes a problem occurs just when you are repairing something else. Coincidence....gotta love it!
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,247
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From: S/W Missouri, Polk county
Ck power, ck elec connections ect...with all the behind the dash work. And mechanical control cables.
If you have to get to the blower with an a/c box PITA. Might as well replace the heater core since you will be that far into it.
1979 F100 Air Conditioning
NORTH COUNTRY SPECIALTIES ®
1973-79 BRONCO HEATER CORE - WITHOUT A/C - BRASS | Laurel Mountain Mustang
If you have to get to the blower with an a/c box PITA. Might as well replace the heater core since you will be that far into it.
1979 F100 Air Conditioning
NORTH COUNTRY SPECIALTIES ®
1973-79 BRONCO HEATER CORE - WITHOUT A/C - BRASS | Laurel Mountain Mustang
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More Turbo
Joined: Oct 2006
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There is a ground that is provided through the selector switch control. I chased that one down a few yrs back. Fix was replace controls. May not be your issue
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From: Simi Valley, CA
and closing as I move the controls on the dash.Compressor "kicker switch" is part of the 19B888 = A/C Vacuum Control Solenoid Assy., bolts to the back of the A/C heater control panel. All the vacuum lines connect to it.
A/C heater blower switch is 19986 (upper pic). Blower motor resistor with factory A/C is 19706 (lower pic).
NOTE: Factory installed integral A/C is combined with the heater.
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