North American Turbocoupe Organization



Loss of blower fan control
Jimmy Yeo Offline
Junior Member
#1
So, it started out as, I would have 1-4 blower speed settings and they'd all work. The switch would be easy to move up and down. Then, the highest speed went out and wouldn't work. Now the complete opposite happened... and I would only have the highest setting and I would have difficulty moving the switch from low to high, and it would be really hard to get it to work at all, so when I got it to stay on high I would have to leave it set to high and just use the vent/floor/defrost controller as an on off. Now after a while it would randomly go on and off as I drove. And today, I lost complete fan control, and it seems to be stuck on the lowest setting, however where I distribute the air works fine. Any suggestions? It's stressful during colder mornings where there's frost on the inside of the windshield. Thanks.
1987 TC 2.3 5spd project/DD
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boosted chicken Offline
Senior Member
#2
I would try to spray some contact cleaner in the switch. It's either that or the blower relay is taking a dump. If you replace the blower relay and it fails a short time later, then the blower motor is usually needing replacement.
88 TC#1 Boport stg 3 alum dport head, PT6466, Boport header, CP pistons, Crower rods, MS2xtra
88 TC#2 drag car project(someday)
88 TC#3 parts car (just needed the header panel...bought the whole car, lol)
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Jeff K Offline
Administrator
#3
Our cars dont have a blower relay like many newer cars do. All the current for the blower motor goes thru the ignition switch, which hastens the death of the ignition switch if the blower is run on high nearly all the time.

Contact cleaner might work, but the switch contacts are possibly burnt due to the blower bearings going bad and the motor pulling extra current. If it only works on high, might check the connector to the blower resistor for damage / corrosion and pull the resistor and have a look at it.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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boosted chicken Offline
Senior Member
#4
I meant to say blower resistor, not relay. I went thru a couple of those when my blower motor was going out.
88 TC#1 Boport stg 3 alum dport head, PT6466, Boport header, CP pistons, Crower rods, MS2xtra
88 TC#2 drag car project(someday)
88 TC#3 parts car (just needed the header panel...bought the whole car, lol)
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Jimmy Yeo Offline
Junior Member
#5
I'm going to take it out and have a look at it when I have some spare time, I don't think it would be the resistor since it would work on occasion? I found the switch very hard to change speeds, so I might have a bad/broken or stuck switch. If that's the case could I just wire up any 4 way switch or does ford have a specific replacement?
1987 TC 2.3 5spd project/DD
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Jeff K Offline
Administrator
#6
Grab a "new" fan switch / rear defrost switch, mode and temp lever assembly from the JY from any 86 (maybe 85) thru 88 Tbird.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Jimmy Yeo Offline
Junior Member
#7
Alright I'll start looking at the wreckers... thanks for the info I appreciate it.
1987 TC 2.3 5spd project/DD
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