It's your coolant gauge temp / overheat light sender connector. See the L shape? Fit's the gap in the top of the sender. The radiator fan switch ('85-'86 Duke) only has 1 wire and is located in the block. Some '84's have a 2 speed fan but not sure what those fan switches look like. The '87-'88 Dukes do not have a fan switch, the ECM controls that function.
[This message has been edited by Hudini (edited 05-06-2010).]
my book shows a sensor with a mushrom shaped head (single wire type) bu that does not jive with my blue plug....the guys at the auto parts store have sold me everything but what i need ...they even want me to cut the green wires off and replace them with a yellow and black set up with a plug like your picture on the left.(not going to happen)
Your wire colors match the FSM description for the 2 speed fan switch connector. Check out page 917 in the electrical schematic section. Here is a link to the 1986 FSM if you don't have it (covers 84-86). http://spad.sytes.net/fiero/manuals/
This look right? RockAuto has it for $32.99 (yikes that's high)
[This message has been edited by Hudini (edited 05-06-2010).]
84? No A/C? Then no two speed rad fan. I think that plug would go to Sender if car had A/C for two speed rad fan. (see cave, rad fan) Sometime GM has wires for option and doesn't use them later...
------------------ Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. (Jurassic Park)
This is a pic that I just took. Are you looking for the sensor that is right by the exhaust manifold. Mine only has one wire (Blue/White stripe). I am not sure what that sensor is. This is from a stock 84 4spd no/ac
Here is a closeup shot of that sensor. Hopefully someone can identify it.
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02:47 PM
lurtz Member
Posts: 270 From: Woodsville, New Hampshire Registered: Dec 2009
Heres a pic from the 1984 Service Manual. That sensor is labeled Coolant Sensor Switch.. The sensor on top of the head is labled coolant sensor switch/sender. Not sure the difference. And sorry for the poor image quality photos were just taken w/iphone.
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02:56 PM
lurtz Member
Posts: 270 From: Woodsville, New Hampshire Registered: Dec 2009
These pics are also from the Service Manual. The first pic shows the wiring schematic for an 84 AC note it has both the green/black and green/white wires.
The second is a schematic of an 84 non ac (like my pic) with just the green/white.
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03:11 PM
PFF
System Bot
johnt671 Member
Posts: 2271 From: sugarloaf pa usa Registered: Feb 2001
Check these pics together. Don't they fit? The sensor has a slot that matches the edge of the connector that looks like an "L". It has a cutout that looks like it matches the little tang that hangs down on the connector. Take a look at RockAuto: 1984 PONTIAC FIERO 2.5L 2474cc 151cid L4 TBI (R) OHV : Electrical-Switch & Relay : Radiator Fan Switch AIRTEX Part # 1S4427 More Info {#3050223, SW591} w/A.C.
[This message has been edited by Hudini (edited 05-10-2010).]
