AC not working

For the AC

Air conditioner blowing warm air only and no cool air? Your A/C cooling problem could be caused by any of the following:

Your A/C system may have lost its charge of refrigerant, or the compressor may not be engaging when you turn on the A/C, or the blend air door inside the HVAC unit may be stuck in the HEAT position so no air goes through the A/C evaporator.

Start with the compressor. Does it engage when you turn on the A/C?

If so, the compressor is working and the A/C system probably contains enough refrigerant to make cold air, so the problem is inside the HVAC unit. Replace the motor that controls the blend air door (this is a difficult job and best left to a professional since it involves tearing apart the HVAC unit -- about an 8 to 10 hour job!).

If the compressor does not engage when you turn on the A/C, see if it will run by jumping the compressor clutch wire directly to the battery (use a fused jumper wire). If the compressor works when you jump it, and the A/C blows cold air, the system contains refrigerant and the fault is likely a bad A/C compressor clutch relay or a bad clutch cycling switch or pressure switch.

If the compressor does not engage when you jump it, the problem is a bad compressor clutch.

If the clutch engages but the compressor does not turn (the belt will start to slip and squeal), the compressor is loced up and you need a new compressor.

If the compressor clutch engages and turns the compressor, but the A/C still does not blow cold air, the system is probably low on refrigerant and needs to be recharged. If you Have an A/C gauge set, hook it up and see if the system has any pressure.

If it is out of refrigerant or is low, check for leaks, then have the A/C system vacuum purged to remove air. After the air is out, it can be recharged with the specified amount of refrigerant. It is important to get any air out as this will reduce cooling efficiency and may make the compressor noisy.

My advice to you if you know nothing about A/C service is to find a repair shop that specializes in A/C repairs and let them fix your cooling problem for you. Today's A/C systems with automatic climate control are very complex and reuire special tools and know-how to diagnose and repair.

Could be the radio fuse/connection or the built in amplifier could be blown

If it's hold vacuum, recharge about 1 can with engine and compressor not running through the high side, then close the valve, then bypass the low prssure cut out switch, usually on the accumulator, then charge through the low side with engine and compressor running. Orifice tubes on the inlet line can get clogged and block the screen, but 200 high and 30 on the low doesnt seem too far off, Low side should read more like 35-40 at 200 high side.

If low side is still at 30hg try putting in a bit more r134, should be at 35-40. Is it auto temp? If yes get a can of compressed air for computers and blow the air temp sensor clean. The one inside the cabin.

So was the system completely empty? Also how much charge did you add weight wise?Unless you start with a empty system you dont know if your over charging it.I know the charge kits give you this gauge that say when its full but you cant tell for sure by pressure if its fully charged you by actual weight charged in the system.You also when you know you have the correct charge weight in the system you need a ac gauge set with the high and low gauges a low one that goes up over a 100 psi to properly trouble shoot it.Also a scan tool that can read live ac data is helpful i did that to find a bad high/switch on the ac system causing the ac compressor to cycle. Also a scan to read ac codes especially if you have auto climate control.Here is a link on our site to help you trouble shoot and a better understanding of how the ac works.Let me know what you find and we will go from there.

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Ok! Your welcome.

If you dont know how much is in system and you charge it and put too much in that will cause it to not work correctly. If its under charged that will cause a problem. The high low switch shuts down the compressor if the pressure is too high or too low.I dont know what the pressures or how much charge is in the system?You could have a bad high low switch bad connector to it etc. Also if you have auto climate control I have seen the outside air temp for the system keep the compressor from coming on. The ac system is complex then just adding charge to fix it sometimes. Also you have a blown ac fuse or bad connector or wire to the ac clutch.

Can you tell if the compressor clutch is engaged? If not, check circuits at compressor relay in power distribution center. Any codes? Some of the national brand autostores will check some codes for free.

Alright let me know what you find.

If your saying the ac blows air but it isn't cool, I'd have to check the compressor clutch, see if it is engaged. If it isn't engaged, I'd check the circuits at the ac relay, two of those terminals should be hot with key on. The pcm grounds the coil side of relay in order to energize. The pcm has to receive an ac request before it will energize the relay. If your low on refrigerant, the pcm may not receive a request.