What A\C compressor to replace Stock unit?

[JBeezy]

I believe my compressor has gone out. It wouldn’t come on today. I had issues before my car was down and I was thinking it was the blend door actuator. I sure wish I knew this while the engine was out. Geesh!!


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[Zack]

You should diagnose the problem first.

[JBeezy]

You should diagnose the problem first.

That’s the plan. Just curious if it needs to be replaced, I will know what I need


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[Marauderjack]

First you need to check the AC Compressor Relay in the box under the hood!!:cool:

Swap it with the horn relay and see what happens......it may just surprise ya as it did me a few years ago!!:eek:

[blazen71]

First you need to check the AC Compressor Relay in the box under the hood!!:cool:

Swap it with the horn relay and see what happens......it may just surprise ya as it did me a few years ago!!:eek:

A/C is still ice cold!

[stevengerard]

mine just burned up - filled the interior with the smell of molten asbestos. Found a complete kit on RockAuto, issue is on their site and everyone else's there are usually at least two choices of compressors. Hard to tell which is correct, the piston replacement or scroll style. The scroll style image is matches the compressor I have.

https://www.rockauto.com/en/catalog/mercury,2004,marauder,4.6l+v8, 1428218,heat+&+air+conditioning,a/c+compressor+&+component+kit,17507

[JBeezy]

Thanks guys. Very helpful info. While I’m happy to have my car back running, it’s the wrong time of the year for my air to not be working. It’s hottt down here


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[JBeezy]

First you need to check the AC Compressor Relay in the box under the hood!!:cool:

Swap it with the horn relay and see what happens......it may just surprise ya as it did me a few years ago!!:eek:

I tried this and the compressor still didn’t turn on. Is there a link here that tells how to test everything? Even if I find it by searching google, for some reason it will not open on my phone


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[Zack]

depress a schrader valve and see if freon is in it.
If not, the accumulator probably rotted out, or there is a hole in the condenser.

Did your problem start after the engine swap?

[JBeezy]

depress a schrader valve and see if freon is in it.
If not, the accumulator probably rotted out, or there is a hole in the condenser.

Did your problem start after the engine swap?

I depressed it yesterday and only hot air came out for the few seconds I did it. I was having some issues with it cooling then not cooling as well from time to time


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[Invective]

https://i.imgur.com/LOyDNBcl.png

[JBeezy]

https://i.imgur.com/LOyDNBcl.png

Nooooooo!!!


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[JBeezy]

Ok. I’ve verified that I’m getting power to the relay pin location so I jumpered over to other large pin location and the clutch did engage. So whats next


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[boom boom]

If the refrigerant is low enough the compressor will not come on.

[JBeezy]

If the refrigerant is low enough the compressor will not come on.

While I had the compressor running I put the can of Freon on it with the gauge and it was low. I added some Freon until it was in the green. I removed the jumper and replaced the relay and the compressor would not come on again.


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[JBeezy]

Ok guys. I hope someone can answer this question. I’m going to replace the low pressure cycling switch that’s located on the accumulator. I got the new switch and pigtail it requires. Only issue is, the factory switch using a 3 wire connector and the new switch only has two. What’s this about or how should I proceed?


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[musclemerc]

binary vs trinary......

[JBeezy]

binary vs trinary......

How should this be spliced or am I missing something? I called Ford and they couldn’t even tell me. This is ridiculous


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[musclemerc]

You cant.... Get a trinary switch...

The switch sends AC on info back to the PCM.

The electric fan will not kick into high when the AC is on without one...

[JBeezy]

Thanks for that piece of information. I don’t know what Ford got going on with this mess. I’ll be returning these things and getting my $70 back. Thanks again


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[Invective]

Is there not a reliable automotive a/c shop in your area? Why are you wasting your time?

[blazen71]

I have an 04 and it has 2 wires. Pic is from 04 manual

[justbob]

I have an 04 and it has 2 wires. Pic is from 04 manual

I see three wires?


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[JBeezy]

Is there not a reliable automotive a/c shop in your area? Why are you wasting your time?

Yes, but I’d really like to figure this out on my own. A shop is the last resort. I’m just like a majority of members here, I like to work on my own vehicle. Always have, unless I come to a point where I have to give up. If I can’t get the answers and solve the issue, I’ll take it to a shop. Thanks for your help. It’s greatly appreciated



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[blazen71]

I see three wires?


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I agree. The diagram shows three but my car has 2?

[musclemerc]

When I did my Trilogy installl I couldnt figure out why my AC didnt work. I worked just fine before the install so I started troubleshooting and fdound I has the AC wiring harness backwards. The drier harness was pluged into the hot side near the header.

Dont judge me, it wasnt hard to mix up

[JBeezy]

When I did my Trilogy installl I couldnt figure out why my AC didnt work. I worked just fine before the install so I started troubleshooting and fdound I has the AC wiring harness backwards. The drier harness was pluged into the hot side near the header.

Dont judge me, it wasnt hard to mix up

Musclemerc for the freakin win!!!! I had no idea that these plugs would plug into both switches. Swapped the plugs and my compressor is now coming on... just wow!!! Isn’t that a rare occasion with Ford’s? I’ve worked on Mustangs for 20 years and usually the harness would only plug into one specific thing. Invective, this is why I try to work on my own vehicle if possible. With the help of this priceless forum and the very knowledgeable guys here, it’s hard to pay a shop for things like this. Just wow and shaking my head at the same time


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[musclemerc]

Hahahahahah......

Dont judge me man........

[JBeezy]

Hahahahahah......

Dont judge me man........

Musclemerc, I’m still in shock. This never crossed my mind. Ever!


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