AC still not working after compressor replacement

2001 Tundra V8. I has the ac light blinking. Checked everything, fuse, amount of freo, tested compression switch (I only found one).
I replaced the compressor and the drier. I put some freon in it, but still blinking.
The ac works for few seconds then stop. This is repetitive whenever I switch the ac on/off.

What else is left to replace? Expansion valve and the pressure switch?
I thought it suppose to have two pressure switches , one for low and one for high!!

Thanks for any feedback

 

Bump.

 

How much Freon did you put in, and did you evacuate and check for leaks?

 

Sorry, I did pull the vacuum and checked for leaks. All was good.
I got it working, but now another upcoming issue.
I got Denso compressor, the seller said that it has some oil just for testing, and I need to add more.
Talked to Denso and they said that it comes with 4oz and I should empty it then put 2 oz back.
Does the oil mixes with the refrigerant? Or it’s in a closed environment?

 

I’m almost sure the compressor would take more than 2oz let alone 4. I just helped a friend with a 80 series land cruiser and his called for like 7oz I think.
But yes, oil will mix and travel around with the refrigerant

 

wow, mine came with 4.7 oz. here is the response I got from Denso senior service engineer:

Your compressor 471-1327 comes with 4.8 oz of oil, you need to remove all the oil out of the compressor and add back in 2 oz of oil, its extremely important that you adhere to this procedure, failure to follow it might results in damage to the AC compressor and possibly a complete failure.
that scares me. This is the first time I messed with ac system, I am glad I did. I am learning a lot.

 

Yeah I had never heard of that process before. Maybe @empty_lord can help out after he’s off work

 

https://www.denso-am.com/products/a...-compressors/practical-tip-on-compressor-oil/

 

Typically I drain the new and old compressor. And whatever I measure out of the old is what I put back. Into the new.

too much oil kills compressors a lot from diy installs I believe most are usually 2oz-4oz max

 

Does that mean that the oil doesn’t get mixed with refrigerant?
Doesn’t the oil also comes out when evacuating the system with the pump?
Even if not, flushing the system more likely to remove oil that is left.

 

Most oil stays in the compressor. It does take some out. But I usually have oil in the compressor when I remove it. There are charts that’ll tell you oil capacity from Toyota. I’m not around a computer otherwise I’d pull them up for you

 

Thank you

 

Refrigeration oil is compatible with the refrigerant. There is no issue if you're using oil specifically intended for refrigeration systems. From what I understand, refrigeration systems are designed to trap the oil in the compressor. If there is any carry-over in the refrigerant, it should be minimal and eventually end up back in the compressor.

 

The oil turns into a mist with the Freon traveling. Oil migrates towards heat, a lot of residential compressors use a leg in the windings hot, as a “heater” to keep the oil in the compressor, others have belly band heaters.

 

What ended up being wrong with the ac? I have the same problem

 

High pressure cut off switch engaging? Too much Freon in the system? Plugged evaporator core causing pressure build up? TXV not functioning properly? Radiator fan not engaging causing the condenser to not coo Freon properly.

 

I by passed the pressure switch and it will engage for a second then disengage.

 

Just to recap on some points:

Compressor and clutch are brand new? Just to make sure it's not a clutch failure.
You've tested pressure on both the high side and low side? Compressor won't stay on if coolant levels/pressure are too high or low.
System was fully and properly vacuumed before reassembly and coolant add? Just so you're certain there's no garbage in the lines?
You checked for leaks, did you check for obstructions in the lines (high/low pressure check would help here)? To make sure nothing is stuck in the orifice tube.

 

I only checked the low pressure side. Ill check the high pressure side tomorrow and start knocking stuff off the list nefore i buy a compressor

 

Take it to a shop that has a recovery system. It will draw all the refrigerant and oil out of the system. Then they can restore the proper amount of oil and refrigerant.