When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Trying to figure a wiring challenge on the 79. I have replaced the AC harness and all harness in the engine bay. However, when I orderd the starter harness I did not get one for an AUX fan as it had been removed at some time in the past and didn't realize it originally had one. The AC harness has the connector for what I assume is the AUX fan connection. Is there a way I can jump these connections so everything works correctly. From what it looks like, I think jumping the red to red and then the blue and black to the black in the other connection would be correct as it would see it as the switch in an always ON setting. Is this correct or am I missing something? Thanks for the help.
Very nice. Yes that helps with a few things I wanted to verify, but still not sure about if I can jump the wires or not since I do not have the fan or the correct connection on the starter harness.
Not sure about what your jumping..
on my 79 the temperature switch grounds the fan and it turns on..two wires to the sensor..i just jumper it in summer so it runs all the time and helps ac...and like now it is just open and off...temperature sensorwonky anyway and very high set point and not cheap
I bought a replacement aux fan temperature sensor for my '81 off ebay. Lots to choose from. I bought a 200 degree on and 185 degree off for 8 bucks with free shipping. Haven't installed it yet, but should work.
I bought a replacement aux fan temperature sensor for my '81 off ebay. Lots to choose from. I bought a 200 degree on and 185 degree off for 8 bucks with free shipping. Haven't installed it yet, but should work.
The replacement sensor I bought off ebay has a single spade connector and grounds through the engine block. The sensor on my '81 has a two wire connector, blue (hot) black (ground). In reviewing wiring diagrams, the black wire on my '81 goes to a common ground shared by other components. Soooo, I figure my new replacement one wire sensor is going to complete the circuit to ground through the block. I will connect the blue wire to the new sensor, and I will leave the black wire off. Your thoughts ??
The replacement sensor I bought off ebay has a single spade connector and grounds through the engine block. The sensor on my '81 has a two wire connector, blue (hot) black (ground). In reviewing wiring diagrams, the black wire on my '81 goes to a common ground shared by other components. Soooo, I figure my new replacement one wire sensor is going to complete the circuit to ground through the block. I will connect the blue wire to the new sensor, and I will leave the black wire off. Your thoughts ??
im weak on that.. yes i think kit completes ground.. but there was a reason they used 2 wires?? it sounds plausible.. but struggle why they used 2
I installed a one wire auxiliary fan temperature sending unit today on my '81. The original 2 wire sending unit had blue and black wires. The blue is hot anytime the key is on, and the black is a common ground. I confirmed that a one wire sending unit will work, by connecting the blue wire only to engine ground and the auxiliary fan came on, indicating that the black ground wire is not needed to complete the fan circuit. My replacement sending unit (10 bucks on ebay) is on at 200 degrees and off at 185.. This makes the auxiliary fan useable instead of the on at 238 degrees and off at 225 degrees that was the OEM. Mine may never come on as I'm running a 180 degree thermostat with a 3 core aluminum radiator and the temperature gauge is glued at 180 degrees when running, but I'm ready if it does.
AC AUX Fan Wiring
