Weird Carb Fan Issue

[FARMAN33]

So I have been getting re-aquainted with the Surfer after 5 years away. When I got her back, the carb fan was not coming on. Quick peek revealed a dangling ground wire. Easy fix! Well... not quite. Re-connected wire to a good ground source and it worked for a day (2 or 3 trips / cycles) then inoperable again. Figured bad ground placement and re-grounded it. Works fine for another day then not. Repeated this cycle now 4 times without change. Always works fr 2-4 cycles then... nothing.

Anyone have a similar issue in the past?

 

[g-man]

Carb fan heat sensor wire broken

On my 84, the wire between the sensor connection plug and the vehicle harness broke. I was able to disassemble the male part of the connector, where the broken wire terminates, but I do not think the female spade connector will survive being unterminated to add a new wire. I am looking for...

forum.ih8mud.com

 

[John Staton]

I dont need my Fan anymore if you end up needing one....worked when I disconnected it wand went Weber....maybe I have the sensor too? depending on where it is

 

[g-man]

The sensor should be mounted to the EGR/pcv metal piping that goes to the intake below the carb. The piping has a bracket on it that holds the sensor. This same bracket also bolts to the exhaust manifold. This piping gets removed during desmog

 

[FARMAN33]

@John Staton @g-man Yeah. I see where the wire that I thought was a ground was actually the sensor wire. Can see the sensor with terminal and no wire. Ran a jumper to confirm but still will not come on. Perhaps a bad sensor?

 

[John Staton]

I am the wrong guy to ask...if you find out your fan is bad your welcome to mine....I never took it off because it was unclear how to get it off. Didnt try that hard as I had a lot of other things on the list back then. I am in The Woodlands. Mine worked when I unhooked it after the desmog.

 

[pdugas]

I had the same problem. The fan ran when it wanted to. I removed the sensor and cleaned it . Then I ran a new wire from the sensor to the wiring harness . I untaped about 3 inches of the harness and there was a break in the wire further back in the harness. No problems since .

 

[g-man]

@John Staton @g-man Yeah. I see where the wire that I thought was a ground was actually the sensor wire. Can see the sensor with terminal and no wire. Ran a jumper to confirm but still will not come on. Perhaps a bad sensor?

Ran the jumper to the sensor? I think the sensor is the ground in a sense. Probably only when its heated to a certain temp then when cools off it loses the ground turning the fan off? What about running the jumper to a different ground to see if you can test the fan.