i have a hypertech 176* fan switch and when i look under the hood both fans are on at 170*,, friends have told me only one should be on,, so did the previoius owner rig this up or is it the hypertech switch??


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1988 GTA Trans Am 350tpi: 46k miles,3:27 BW rear, aftermarket t-tops
Hotchkis: subframe connectors & strut tower brace
Flowmaster: 3inch exhaust& dual chamber muffler
Accel: 8.8mm wires, cap&rotor, u-groove spark plugs
Edelbrock: 52mmTB, intake & runners
K&N: filtercharger
TPIS: 170* stat, afpr, mat relocation kit
March: performance crank and alternator pulleys
Hypertech: 176* fan switch
Other mods: ported plenum, gutted cat, tb coolant bypass, homemade cold air induction, flux capacitor, driver side floor mat removed

 

When I put my Jet160 in, both fans came on. I think it's just the way it is. Carefull on your voltage consumption around the time when the fans are coming on. (I know the coolant temperature at which my fans will kick in)...near this point on the guage, make sure your defogger and AC are off. Also, I never run my fog lights on with the fans either. Those two fans coming on at the same time give a serious kick to the alternator...so I've installed a 875CCA battery with custom tray instead of the stock 650CCA piece of crap battery. Put in some new thicker cables as well..

Steve

 

i have no charging problems,, even with all my accessories on,, i just want to know if BOTH are supposed to be on??? or did the previous owner rig something up.

 

Ron - only one fan is supposed to come on when the coolant reaches temp, which is controlled by the fan switch in the head. The other fan is supposed to come on when the A/C or defrost is selected, and is controlled by a pressure switch in your A/C system. So it sounds to me like someone rigged it's current operation up...

KAM

 

I'll toss in another...

Both of mine come on with the lower seting fanswitch, my wiring was not rigged, I bought the car new.

 

Yep, both fans will come on. I guess the ECM turns on the other fan cause my AC is off and it still always comes on. I'm thinking of wiring a switch with a relay to turn on the second one though as it really isn't needed except on very warm days or when stuck in traffic.
Steve

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89 GTA G92
305 TPI WC 5spd w/3.45
Accel Cap & 8mm Taylor's
Custom 4" Cold Air Induction
Jet Airfoil
K&N Airfilter
160 deg stat/fan switch TB Bypass - Steel Rad
Cat back 3" Exhaust w/Terminator Muff.
HiGh FlOw Dynomax Cat
Spohn LCA's - KYB GR-2's
Moroso Crank Bolt and roller pilot bearing.
New Fuel Pump!
Autometer Vac+Oil Temp
2000 Yamaha R1 150hp 385ibs