Search results for query: Carb cooling fan circuit board

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  1. mattressking

    fj40 carb cooling fan...do you run yours?

    I don't see the ground switch wire to your sensor. Sensor isn't required, it is only to provide temperature resistance to ground switch wire to unit. Locate the ground wire (Blue/Black or Solid Blue) off harness on driver fender (single wire, would be in combination with fuel cut solenoid...
  2. tls3601

    ‘78 Carb cooling fan relay

    I have had my cooling fan working great in the past. Once it quit and I replaced the 5A inline fuse under the dash, worked again just fine. Recently it stopped working again only to find everything connected and inline fuse looking just fine but replaced with a new one anyway but to no avail...
  3. DougAustinTx

    ‘78 Carb cooling fan relay

    Found my carb cooling fan/controller post. It has photos and an explanation of some of the differences in the early and late models. Repair of '79 - '80 carb cooler fan controller circuit board Your 1978 model should have the M3 type relay (a small silver cylinder in the wiring harness) that...
  4. Solace in Solitude

    ‘78 Carb cooling fan relay

    There’s a lotta related info available on MUD, Tom. Below are the results of a quick search for “carb cooling fan circuit board” in this forum... you could try other parameters and get more results. @bsevans repaired his board and IIRC @unixman repaired or rebuilt his. I got bored with...
  5. Solace in Solitude

    WTF is this?

    I don’t recall what the carb cooling fan “activator” (I cant recall the name) looks like, but I think this “button” is it. it would normally be mounted under the manifolds and would close a circuit, by activating a ground, to trigger or activate the carb cooling fan at a certain temp. Old...
  6. DougAustinTx

    Repair of '79 - '80 carb cooler fan controller circuit board

    My '79 40 didn't have the blower for the carb when I got it about 6 years ago. Until recently I was ignoring my hard-starts after the engine was warm and then sat for a while. I started reading the LONG threads about guys on MUD getting their carb coolers working and having much success with...
  7. ToyotaMatt

    1975 FJ40 Instrument Panel Not Working

    B+ KEY should also be marked IGN. on the blue circuit board
  8. Groucho263

    1975 FJ40 Instrument Panel Not Working

    Guys, This forum is awesome thank you in advance for the help...finally got the 40 running (after new carb, rear main seal, oil pan gasket, valve adjustment, clutch/throw out bearing work, rear output seal, fan clutch, new cooling hoses, thermostat, water heater, radiator, cooling system flush...
  9. unixman

    OEM Carb Fan Controller Replacement

    Several years ago I found out my '78 had something commonly referred to as a "carb fan" and associated thermistor and controller. I didn't notice it was there because it had never worked. A PO had replaced the fan controller's inline 5A fuse with a 15A fuse. That's likely why the controller...
  10. T

    1979 FJ40 Multiple issues

    The fuse for the cooling fan is a 15 amp fuse and appears ok, and the manifold temp sensor is connected, have not pulled the box apart yet, will do tonight. Thank you for your quick service on providing me the fusible link, very nice work!
  11. T

    1979 FJ40 Multiple issues

    I purchased my current FJ40 non-running, carburetor in a box, sitting for 15 years. PO had a dual battery setup, which had been removed when I bought it, lots of auxillary lights which I removed, and had used 30 amp fuses throughout. I have since replaced all fuses to the correct amps, replaced...
  12. TractorDoc

    Builds Doc's 1978 FJ40 Rebuild

    Thanks Gator. Thats one of my many nephews. While I do not have any young 'uns of my own there is usually one or two nephews around here on the weekends to lend a hand. Joe is the youngest but he is also mischievous . . . he likes to hide important components when you need them the most...
  13. spotcruiser

    carb cooling fan question......

    Yep, the light blue wire with the green plug, below the brake pressure switches, shown in your 2nd and 3rd photos runs over to the cooling fan temp switch. It mounts through an L-bracket bolted to the manifold. The original wire to the switch can fail due to heat (notice the heat sleeve on...
  14. jestlurnin

    Carburetor fan help

    Does Any One Know Where To Obtain The Following Information About The Circuit Board For The Carburetor Cooling Fan Box???!!!! Does It Exist? A schematic drawing of the circuit board, and a PEB assembly drawing with reference designators If I can find this info my carb cooling fan will be...
  15. jestlurnin

    Carb cooling fan help

    I'm in the middle of trying to fix my carb fan as well. I'm not going to be much help in the aftermarket thermo switch discussion because I've always just grounded that lead rather than try and replace it. The carb fan runs for about 20 minutes after engine shut off and then stops. My buddy...
  16. RolandFJ40

    Carb cooling fan help

    Well when I pulled my board out it was obvious what I needed to replace. If you hold the board with the components facing you, orient the board so the connector is to the top, relay to the bottom. There are two diodes lower right corner on mine that were fried, and had crappy soldering joints. I...
  17. jestlurnin

    Carburetor fan help

    Gentleman we have an update. My buddy that's helping me with the problem as I've mentioned is a electrical test engineer for a very large electronics company. And in my humble opinion put together a series of steps that is pretty full proof in allowing one to figure out where the problem is...
  18. bsevans

    carb cooling fan trouble shoot

    My carb cooling fan did not function when I bought the vehicle in 1987. I went through the system and resolved the issue to the control circuit. I pulled the box under the dash on the drivers side and exposed the circuit board and found that the problem appeared to be some of the solder joints...
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