Mg clt clutch relay location to fix ac

[Syndragy]

For a test. What happens when you apply battery voltage to the ac magnetic clutch? You can even to this with everything off. Does it click?

With the engine running, does the magnetic clutch engage, and is the pressure on the low side dropping?

Might be able to rule that out as good or bad.

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I'll get a multimeter tomorrow to run the tests, but can it even be tested if I'm unable to activate my AC at all?
I think I might have to just try another hvac control unit, since I believe I've checked every AC related fuse/relay....so I shouldn't be having electrical issues with the unit.

Also, the magnetic clutch has not engaged since I've owned the car

 

[Bad Luck]

I'll get a multimeter tomorrow to run the tests, but can it even be tested if I'm unable to activate my AC at all?
I think I might have to just try another hvac control unit, since I believe I've checked every AC related fuse/relay....so I shouldn't be having electrical issues with the unit.

Also, the magnetic clutch has not engaged since I've owned the car

You have to physically apply power and ground to the ac compressor clutch at the connector to test it how Brillo is suggesting.

 

[Syndragy]

You have to physically apply power and ground to the ac compressor clutch at the connector to test it how Brillo is suggesting.

Ah so run a ground and negative wire from the battery and to the compressor clutch to jump start it? Sorry, this is a whole new world to me.

 

[brillo_76]

Ah so run a ground and negative wire from the battery and to the compressor clutch to jump start it? Sorry, this is a whole new world to me.

Ok. If the battery is connected to your terminals. The ground should be coming through your chassis. A little positive wire connected to the compressor clutch wire. Then, touch the other side to the positive terminal. You hear the magnetic clutch click with everything off if that clutch is engaging....

Granted, this wire has to be insulted, so it won't be short on anything.


If you like to verify ground. The wire would attach to a bolt etc on the ac pump and go to the negative terminal.

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[Syndragy]

Ok. If the battery is connected to your terminals. The ground should be coming through your chassis. A little positive wire connected to the compressor clutch wire. Then, touch the other side to the positive terminal. You hear the magnetic clutch click with everything off if that clutch is engaging....

Granted, this wire has to be insulted, so it won't be short on anything.


If you like to verify ground. The wire would attach to a bolt etc on the ac pump and go to the negative terminal.

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I appreciate the step by step!
I successfully ran the test and I do indeed get a clicking sound from the compressor when tapping positive terminal.

Probably good to mention the car did come with aftermarket sound system, so maybe the PO loosely connected the HVAC unit, or forgot to in general. I will investigate this after work.

OR I wonder if there’s an actual AC relay that I’m unsure of it’s whereabouts

 

[brillo_76]

Ok now with the engine running. Will compressor spin and the pressure drop while running using a positive terminal wire to the compressor clutch wire?

If it does the magnetic clutch is working.

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[Syndragy]

Ok now with the engine running. Will compressor spin and the pressure drop while running using a positive terminal wire to the compressor clutch wire?

If it does the magnetic clutch is working.

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Nope, no response when running. But isn’t that because I can’t enable AC/recirculation?

 

[Bad Luck]

Nope, no response when running. But isn’t that because I can’t enable AC/recirculation?

If you are manually sending power to the compressor clutch and the compressor doesn’t engage while the engine is running then you have a compressor issue at a minimum.

 

[brillo_76]

You have to use the same procedure as I said before carefully, not to get wires stuck in anything.

If you did and your compressor is not spinning with the low pressure fluctuating. Your compressor may have issues.







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[Syndragy]

ah....so it is a sad day then.

I did also pull the control panel out to make sure all connections were made, they were..

So I guess I'll come back when I have a new compressor installed
Thanks for all the help thus far, I appreciate it

 

[19963.4lsr5]

If you are manually sending power to the compressor clutch and the compressor doesn’t engage while the engine is running then you have a compressor issue at a minimum.

The clutch can be replaced if it’s available but it requires special tools.

I have the tools to replace Sanden clutches but not Denso ones.


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[Syndragy]

Ok now with the engine running. Will compressor spin and the pressure drop while running using a positive terminal wire to the compressor clutch wire?

If it does the magnetic clutch is working.

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I just did more tests with pressure switch jumped and clutch manually engaged, PLUS gauge hooked up and it came back as slightly low refrigerant as the clutch was spinning.

Filled it to the green mark (until no bubbles were present in the AC sight glass), removed clutch jump, and still had no functions to the AC/recirculation buttons.

Worth noting the clutch ONLY engaged and kept spinning as long as the jumper was making contact on the battery's positive terminal. I could upload videos of this, if needed.

 

[brillo_76]

The compressor and clutch would be working. As you were seeing the refrigerate moving.

So you need to figure out why the system isn't getting power.

Your ac system isn't getting power. Or has issues with that side of things.

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[brillo_76]

The 2002 manual ac EWD

 

[Syndragy]

Thanks again, I'll give this a read.
in the meantime, you could check out these two videos for more information.

Here's the first time I manually engaged the compressor clutch with the gauge attached.
2001 4Runner Clutch Jump - YouTube


Same thing, but compressor squealing as I am recharging freon here and there; pressure surges up and down.
2001 4Runner Clutch Jump, Pressure Surge, Compressor Squeal - YouTube

 

[brillo_76]

Ok first off your ac belt might need tightened.. I hope you didn't overfill the system .

The first video the pressure dropped really low.

You have to be very careful. You can overcharge the system as well, which can blow the compressor.

You need to figure out why you are not getting power.

[ The ac amplifier is mostly on the evaporator box behind your glove box]

Even if pressure switches are bad. I would think the ac light would still kick on in the button.







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[Syndragy]

My issue is now resolved.

For anyone reading this for help for oneself, mainly experiencing no function/lights to your ac and circulation button.

For my 01 manual ac system, there was not a ac amplifier behind/under the glove department box, like the other years. The AC amplifier is built into the HVAC control unit, so swapping that out solved my issue.

Fully functional AC now! You can try to run all these tests you want, but it doesn’t really matter if you can’t electronically command your AC/compressor to be turned on. Will update with photos for better help and probably upload videos to YouTube for future 01/manual ac havers.

Thanks everyone for your effort in solving my AC issue, till next time!

First photo is typically where you could find the AC amplifier. In my case, it is integrated into my HVAC control unit.

 

[brillo_76]

Good job you found your power problem...

Edit

Also good to know the 01 and 02 ac amplifier went up into the controls. Even for the manual ac..

1996 through 2000 are on the evaporator box.





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[Syndragy]

Good job you found your power problem...

Edit

Also good to know the 01 and 02 ac amplifier went up into the controls. Even for the manual ac..

1996 through 2000 are on the evaporator box.





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Amen, may we help future help needers in the future.

 

[HiLife]

Yes, your post is helpful. Thanks for documenting your steps and findings.

Im dealing with almost the same on a 2000 with a manual ac set up.