North American Turbocoupe Organization



Cooling fans not coming on.
BabyBlueBird Offline
Member
#1
Long story short i got stuck in some traffic on my way home and my temp gauge started to creep up until I turned on my AC to kick the fan on. I was doing some diag on it tonight and when I turn the key on the passenger side main fan turns on but the drivers side aux fan does not. Also as the temp gauge starts to climb my fans will not come on at all, only when I turn on the ac. My first thought is the coolant temp sensor. I’ve had zero luck with any after market brands for them and I can’t source a ford part. Any ideas?

Edit: when I have time this weekend I plan to go through the basics like jumping the coolant temp connector and seeing if the coolant hose on the bottom of the intake is clogged.
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88Slowbird Offline
Member
#2
Driver one only turns on when the temp gets to 220

Passenger side turns on at 210 or when A/C is on
1985 SVO: Pro 5.0 Shifter, Boport valve springs, Manual boost controller, AEM wideband
1985 TC 5 Speed
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Mikey97D Offline
Senior Member
#3
Here's an article to test the fans:
https://turbotbird.com/thread-cooling-fan-test
1988 TC, 5 spd, Stinger 3" Exhaust, Schneider Roller Cam, -4° Cam Pulley, Cone Filter, Gilles Boost Control Valve set at 17 psi, Walbro 255 lph, CHE Rear Lower and Upper Control Arms, Braided Brake Lines, Hawk HPS 5.0 Front and HPS (F) Rear, CRES Inserts in front calipers, and '93 Cobra Wheels with General 235/50R17 Tires.   
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BabyBlueBird Offline
Member
#4
Found my original temp sensor I took out a few years back and slapped it in. Works perfectly. Needle hits the half way point and the fan kicks on. Just amazes me a company can’t make a reliable replacement for such a simple sensor.
Mikey97D and Jeff K like this post
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Kuch Offline
Senior Member
#5
I also use a Ford part for this temp sensor I get out of a 5.0 in the junkyard. Also, that passage tends to get clogged up real bad and the coolant doesn't floe over the sensor. Mine was real bad and had to use a drill to clean it out.
1988 Turbo Coupe, Black/Black, 5 Speed, Moonroof,  T3/T4, ported E6, 255LPH, Kirban, Stinger Exhaust, MGW shifter, K&N, Gillis valve, BP1.5, PIMPx, Koni's
1964 Ford Galaxie 500XL, 390 6V, Big Solid cam, Headers,3.89's, 4 Speed, Vast and fast
1960 Ford Starliner, 292 Y Block, 312 4bbl intake, headers, 3 Speed, slow and low
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anasazi4st Offline
Senior Member
#6
(03-15-2024, 11:23 PM)BabyBlueBird Wrote: Found my original temp sensor I took out a few years back and slapped it in. Works perfectly. Needle hits the half way point and the fan kicks on. Just amazes me a company can’t make a reliable replacement for such a simple sensor.

Yeah when I replaced the head gasket in 2011 I decided since I already had half the engine apart I would replace the various coolant hoses and things like the temp sensor, that are really difficult to get to otherwise. On the test drive my new temp sensor sent the needle almost to the top of the gauge. This kind of freaked me out, as I didn't know if there was now an internal problem after reassembling the engine. When I got home, driving very slowly, I replaced it with the original. Gauge was back to normal; so I went out and got temp sensors from various parts stores, and tested them in a pan of water that I gradually increased the temperature to boiling, then 220 degrees. The current readings were all over the place--some had "hot" resistance at 220; some at 210, etc.

It does seem like such a simple thing. I blame it on a "universal" one designed to work in as many cars as possible.
Another proud dues-paying member.

1987 Turbo Coupe w/T5OD, 8.8 axle, grey smoke; most options. Got it in 1991 with 41K miles: 3 turbos, 2 heater cores, 3 T5OD full rebuilds, 6 clutches, 1 head gasket, 2 Teves II ABS units, etc. later....
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