WTF is this thing! (1 Viewer)

[Hold my beer]

Hello!

Should be an easy win for someone on here but I searched and searched but cannot find where someone states what this thing is. Its on the outside of the heater core. Mine is missing and my heater core won't turn on. Extra points for anyone who knows where to find them (...or I can Google it afterwards )

Thanks for your help!

 

[Seth S]

Not sure but if its on the ductwork outside the heater core it might be the fan resistor. Nope...nevermind...the blower resistor is above the throttle pedal

 

[ceylonfj40nut]

AC amplifier. It controls when AC comes on and off

 

[ceylonfj40nut]

AC amplifier. It controls when AC comes on and off

it controls this using a tach signal from emissions computer.

 

[Seth S]

Ok, its the AC amplifier

FJ60 Air conditioning troubles.

I am trying to trouble shoot my A/C system before the heat and humidity hits here in TX. This is a bit long, but in searching past threads, I didn't see much in depth diagnostic info on the A/C system. I have the FSMs, but didn't know how much of the diagrams were still appropriate since my...

forum.ih8mud.com

 

[Hold my beer]

it controls this using a tach signal from emissions computer.

Gold effin star for you, sir! I’ll try and track one down...please tell me that if this is missing it will also keep the blower from working generally - I’d love for it to be as simple as popping one of these in and it works again, haha!

 

[Hold my beer]

Ok, its the AC amplifier

FJ60 Air conditioning troubles.

I am trying to trouble shoot my A/C system before the heat and humidity hits here in TX. This is a bit long, but in searching past threads, I didn't see much in depth diagnostic info on the A/C system. I have the FSMs, but didn't know how much of the diagrams were still appropriate since my...

forum.ih8mud.com

View attachment 2442198

Heck yeah that’s the good stuff! Thank you!

 

[ceylonfj40nut]

Gold effin star for you, sir! I’ll try and track one down...please tell me that if this is missing it will also keep the blower from working generally - I’d love for it to be as simple as popping one of these in and it works again, haha!

If you are in heater mode your blower should work without the AC amplifier as I recall. If it does not, hot wire the blower motor to see if it works. Otherwise your blower maybe toast

 

[John Staton]

I burned a couple out and after having to locate a couple and getting my AC to blow ice cold only to have it go out again I bypassed it. It does 2 things...cylcles your compressor on and off and will adjust your idle your when you turn on the AC. Since I have a weber carb I dont need the idle control. I now have to hit my AC button when the AC starts dropping to freezing...not the worst problem to have but still kind of a PITA. I have seen someone replace it with a small box that has a temp prob on it and will cut power when it drops too low and back on when it gets to a certain temp. Just has not been a priority to fix, and the guy that post the fix didnt answer me.

 

[2mbb]

I don't think the AC amplifier is needed to make the blow run. At lease your AC doesn't need to be running/engaged (blower runs when you are heating). You can confirm the wiring via the attached document. If the blower is working, you need to trouble shoot that--fuses, circuit breaker, resistor, etc.

 

[John Staton]

here is a work around for the blower fuse. Mine kept tripping...the OEM fuses can be reset but they are not the most reliable. This has been since installing over 2 years ago.....

 

[Hold my beer]

Thank you everyone! I really appreciate you all jumping in on this. I hope to be as helpful one day!

 

[aviafx]

Gold effin star for you, sir! I’ll try and track one down...please tell me that if this is missing it will also keep the blower from working generally - I’d love for it to be as simple as popping one of these in and it works again, haha!

Can confirm blower works without amp - mine is unplugged as a/c setup is removed.

 

[Hold my beer]

Can confirm blower works without amp - mine is unplugged as a/c setup is removed.

Thanks for confirming the bad news! I am going to be in dead of winter trying to fix this damn core

 

[FJACS]

If the blower resistor is bad, the blower motor will still work on full speed.

if none of the fan speeds work, you need to look at the actual blower motor or it’s wiring.

 

[ceylonfj40nut]

^ this. If none of the fan speeds work take 12v + and 12v - directly from the battery using some spare wiring and connect to blower power pigtail to see if the blower works. You can also unscrew it from the bottom (three screws), take it off, test is as above with shorter test leads on battery.
Blower has been known to be a collection point for leaves, rates nests, and more. It may not turn because it is clogged. Opening it up is a good idea.