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Cooling Fan Switch
Last weekend my temp got up pretty high. I got to where I was going before it got too hot, but it did end up overflowing after it sat. The fan turns on when the A/C gets turned on. I can ground the wire at the fan switch (on the motor) and the fan will turn on. I've let the car warm up and put a test light on the switch. The outside of the switch is grounded, but the center peg never grounds.
Printing from undefinedFig. 1: 2.5L (VIN R), Cooling Fan Circuit, One Speed, W/ A/C & Heavy Duty Cooling 1986 Pontiac Fiero GT 1986 System Wiring Diagrams Pontiac - Fiero
The Fiero Store85-88 Pontiac Fiero Coolant Fan Switch Located next to the thermostat housing. This switch screws into the intake manifold vertically, next to the thermostat housing and the cold start injector switch. It has a one wire connector. Temperature Gauge Sending Unit Located on the top corner of the rear cylinder head.
Fiero Cooling fan fixedFiero Headlight motor test and relay replacement. 1984,1985, 1986 Headlight motors - Duration: 5:45. Jerr Spud 241 views
How the Fiero cooling Fan sytems worksA/C equipped vehicles have a separate signal wiring to the ECM for a fan control. When the A/C control switch is on, and the low pressure switch closes, the ECM receives a signal on this line and turns on the fan. The A/C clutch does not have to be in gauge for the ECM to turn the ON the fan. Tips:
Coolant Sensors/SwitchesOn the 4 cyl. the location of the fan switch is on the side of the head, aiming forward toward the firewall & below the temperature gauge sender and has a single wire connector (single speed) or 2 wires (2-speed fan). The 87-88 4 cyl fan is controlled by the ECM and does not have this switch.
Radiator fan not runningThe fan is fairly simple. There's a relay that switches power from the battery, that relay is controlled by a thermal switch in the cylinder head. After knowing what engine and year yours is we can tell you how to do some quick checks. One is unplugging the thermal switch and grounding the wire to the block, that should turn the fan on immediately.
Fan Relay UpgradeAll in all, this is a very inexpensive insurance against fan relay failure, and the installation looks stock and is identical to GM's solution on the 1988 Fiero. As a final note I want to mention that Ecklers also carries the successor fan relay kit used on the '93-'99 Vette (P/N 30974), this is the square type relay with a single mounting hole.
Fiero Online Service GuideSENSOR/SWITCH PART NUMBER WIRE LOCATION coolant fan switch dk grn/wht 84-86 two speed 3050223 lt grn/blk L4- LH front of head 84-86 non A/C 3040674 85-88 V6 all 3040674 dk grn/wht V6- RH top of engine near thermostat gauge/lamp sensor dk grn 84-88 all 25036628 L4- LH front of head 85-88 all 25036809 dk grn/wht (V6) tan (L4) V6- LH rear head next to edge of exhaust manifold ECM coolant sensor ...