Hi, I just put in a newer 2f engine in my truck. Before the swap the carb fan kicked in properly. Now, the thing isn't running. I've noticed a wire that leads into the firewall and I'm guessing into the harness. The wire(which is near the fan) is not connected to anything but when I ground it, the fan starts up. Will the fan turn off on its own if I just keep the wire grounded? That wire is definitely associated with the fan. Idk.
Also fights Intake/Exhaust manifold warpage since that part of the engine bay doesn't get the greatest circulation with all the damn vacuum hoses clogging it up.
that wire is supposed to attach to the temp sensor on the bottom of the intake, behind the carb. it commonly fatigues and breaks off. The sensor is so that the fan only turns on when underhood temps are above 120*F
It is not really all that important unless you are in areas that have high ambient temps as well. If you have :hot start" problems. look elsewhere for the cause.
But it sure does not hurt anything to have it working either.
Thanks for that Mark W. I don't live (i wish i did) in a high ambient temp climate. I do though have hot start issues. I stop for 5 minutes after driving for hours, and it take so much effort to get her going again. Cold starts are also struggle. I'll be looking at the carb soon and possibly a rebuild there.
I live in Alaska. When I bought El Burro last year she was a bit of a pain in the A$$ to start after she had reached operating temp. I did a search on here and discovered the cooling fan issue. I fixed that and ever since she starts right up when at temp
I live in a summer time hot environment. My carb fan quit this summer and I learned all about hot start issues. It makes a huge difference and you want this device to work.
If you ground the wire, It should run about 20 minutes on every shut off. if you use it with the temp sensor, it works depending on underhood temps. I did not know that 120F was the shut off, so good to know. Mine runs on most hot shut downs, regardless of outside temp, but then the winter time low here is in the 35F range, so not real cold.
Yeah, I don't like to leave things disconnected like some guys. I'd prefer to hook it up properly to the temp sensor because it was put there for a reason!! Carbs are very delicate systems and I'll do whatever I can to keep it comfy. Otherwise it'll bite me in the arse one say.
Connected that 'mystery wire' to what I thought was a temp sensor but nothing happens. There is a connector on the actual exhausts manifold below the carb and towards the back of the engine that doesn't have a wire running to it. It appears to have been broken off. So that's where I thought it would go. Grounding that wire triggers the fan to turn on but not to turn off. Can I bypass this route and install my own temp control relay or something that can operate the fan correctly?
Connected that 'mystery wire' to what I thought was a temp sensor but nothing happens. There is a connector on the actual exhausts manifold below the carb and towards the back of the engine that doesn't have a wire running to it. It appears to have been broken off. So that's where I thought it would go. Grounding that wire triggers the fan to turn on but not to turn off. Can I bypass this route and install my own temp control relay or something that can operate the fan correctly?
I'm posting as many as possible to try and help you guys out. Went out in my pajamas. Anything for a cruiserhead
The red wire off the fender and running to the sensor is a replacement. The original wire was a different color. Don't remember which.
Just wanted to show where it comes off the fender. It may help. I cut the mount off of the original equipment for the temp sensor. You can see it in one of the photos. Held on by two bolts on the intake.
