willyt4r

1991 4runner 3.0 4WD 5SP. The cooling fan for he AC condenser was not engaging properly causeing an increased engine temperature. The culptrit was the Fan resistor block- Part number 88635-89107. The local dealer wanted $46. A trip to the Pick A Part, amongst 6 retired 4runner's, showed that all have suffered from the same malady- detached wiring form the resistor block. My solution was a $ 1.99 0.5 Ohm 5 Watt resistor from the local Radio Shack. Placed the Resistor in the existing holding bracket, soldered the connecting pigtail.. Success the AC cooling fan engages.

ToyotaViejo

Just to be clear, you bought a 0.5ohm 5watt resistor? I'm only asking for confirmation because that isn't a real common resistor afaik.

Mine has been broken off since I bought the truck. The terminals just rotted through.

Inspection indicates that with the A/C on, the auxiliary fan runs at what is presumably full speed.

Even in gridlock in Southern Arizona heat with the A/C on full-tilt, the temperature indicator never gets further from cold than about 3/8 - comparable to my 1992 Camry.

Though it is obviously broken, it doesn't seem to be causing any problems.

I subscribe to the notion of not fixing what isn't broken, so should I bother fixing this?

I can get an employee price from Toyota, so I'll likely just get the OEM part if it can be found.

In either case, though, the wires are corroded off. Does it matter which way they are reattached? I don't think resistors have a "direction," but I wanted to make sure.

Thanks!

Culpeper

It only controls the slow speed of the fan so I don't know why the OP even bothered with the Radio Shack mod. Most of these old resistors have been disconnected a long time ago giving the fan one speed. High.

kevyg

i know this is an old thread, but i think the last post is misleading. looking at the diagram, the resistor is inline with the condensor fan motor (to provide fan low speed), so if it's disconnected there will be no operation of condensor fan UNTIL the high pressure switch opens allowing the a/c condensor fan relay #1 to deenergize and allow electricity through the parallel resistorless path (fan high speed). So a better "free" fix is to simply
connect the two wires that used to connect to the resistor to each other. That way, when the A/c is on, the fan is on high

Co_94_PU

iTrader: (-1)

Bankruptcy again...

Digikey has you covered, link

RAD4Runner

YEEY! If three of those would fit in the space, that would definitely work, and I think will last longer than OEM

OR... how about wiring the connector to daytime running lights? Or.. theoretically, instead of dissipating the power as heat in the resistor, substitute the resistors with daytime running lights.

Co_94_PU

iTrader: (-1)

Oy math!

I just up sized the radio shack part, from 5 to 20 watts, partly because it seemed low and partly because I liked that vishay parts layout and it's listed as water resistant..

Condenser fan runs at 8 amp ±0.7 on 12 volts, that is ~96watts.
P = IR
~25-30w. Should be OK with 20watt rating since we have the air flow from the primary engine fan.

Might get some funny looks with the day time lamps flashing on and off with the high low speed switching of the fan..

Edit/PS: they have the 40w same style.. link