North American Turbocoupe Organization



Cooling fan comes on but won't shut off
Entropy1988 Offline
Junior Member
#1
Well, another problem reared its head. Apparently the radiator cooling fan comes on but won't shut down after the coolant temperature drops. 

Any suggestions where to start looking ?  Also, it seems that the temp gauge reads on the low side.
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Kuch Offline
Senior Member
#2
If you have a bad engine coolant temp sensor, the one that is mounted in between the injectors on an 88TC, that could cause it to act strange. Go to a local junkyard and grab one form an 80's Ford and swap it in to see if it corrects the problem. Mine was bad and replaced with a parts store replacement, but it never worked well, replaced with a genuine Ford one from an 80's Crown Victoria and works great now.
1988 Turbo Coupe, Black/Black, 5 Speed, Moonroof,  T3/T4 50 trim, ported E6, 255LPH, BBK AFPR, 3" DP dual 2.5" w Hooker Maxflows, MGW shifter, K&N, Gillis valve, RR cam
1964 Ford Galaxie 500XL, 390 6V, 4 Speed, Vast and fast
1960 Ford Starliner, 292 Y Block, 3 Speed, slow and low
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Jeff K Offline
Administrator
#3
In addition to what Kuch said, it is possible the fan relay(s) are sticking shut. Next time the fan wont turn off, give the IRCM a good rap or 2 with a small hammer, wrench, etc. If fan turns off, replace IRCM.
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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Entropy1988 Offline
Junior Member
#4
Ok, I'm going to try changing the sending unit first. See if I can get one from a ford of similar vintage.  I have a new RCM which I can install if that doesn't work.
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