Even a paper clip will work. To check/jump the low pressure switch, don't run a wire from the battery. To get the compressor going again, we have to energize the clutch by bypassing the pressure switch. I Have Replace The Fan Motor. Just open the gauge and let the system take in refrigerant and the system will kick on. If I jump 2 the compressor kicks on. Wednesday, January 18th, 2017 AT 10:45 AM Turn the system off.This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

I can confirm that a can of R134a should provide enough pressure in an empty system to kick on the pressure-cutout switch.
Was expecting you Hyundai mechanics would simply look up the wiring diagram [I don't have one] and tell me which socket contact points to use.

Friday, April 1st, 2011 AT 4:42 PM

To submit your questions or ideas, or to simply learn more about It Still Works, A compressor that cycles on and off repeatedly most likely needs refrigerant. Most likely, a vehicle with an air conditioning system that will not cool has a low refrigerant level.Remove the air conditioner fuse. When the pressure increases from charging the compressor will kick on. A good fuse, found in the fuse compartment, will not have any black burn marks. bypassing pressure switch for air conditioning - how safe. System leaked to the point where the high pressure side is less than 29 psi. I Bought An A/c Recharge Kit With A Pressure Gauge For My 2002 Hyundai Elantra. Automotive air conditioning systems with low refrigerant levels must have the leak repaired before recharging the system. Even better if the system has had a vacuum slapped on it before you try refilling.

This opens the pressure switch and disconnects the clutch. An automotive air conditioner's pressure switch cycles the vehicle's compressor on and off when the refrigerant pressure falls below an acceptable level. Friday, April 1st, 2011 AT 1:21 AM

If not, repair the leak and add refrigerant.Disconnect the pressure switch electrical plug. Place a lead on each fuse terminal. You can connect a jumper wire across the leads on the connector. If not, troubleshoot the electrical system leading up to the pressure switch.

Place one lead against the vehicle frame and the other lead into the plug openings, one at a time. This protects the compressor from damage. Compressor clutch won't engage because the switch inactivates the clutch circuit. Refrigerant does not wear out or evaporate: only leaking air conditioning systems have low refrigerant levels. The meter should read continuity if the system has an acceptable refrigerant level. Have done this before on other makes, but usually the pressure switch is a simple two lead situation. Just don't run the compressor too long with no refrigerant/oil in your system. Use a stiff piece wire bent in a U shape to jump the plug (should be just two wires) stick your jumper wire in the plug. The A/C compressor clutch will not engage because of low R134a pressure. There is no need to jump the pressure switch to do what your doing I have never had to do that for charging if its not charging then you have another issue. This operation is like the original factory charge and repeated everytime a new commpressor is installed and system evacuated. Went to jumper pressure switch to start charge but found 4 contacts rather than two. Turn the system off.Insert a jumper wire into the two openings of the plug. This opens the pressure switch and disconnects the clutch. An automotive air conditioner's pressure switch cycles the vehicle's compressor on and off when the refrigerant pressure falls below an acceptable level. Thursday, March 31st, 2011 AT 10:46 PM You will have no idea how much charge you already have in the system so it would be really easy to overcharge it and with the switch bypassed it could get ugly. System leaked to the point where the high pressure side is less than 29 psi.

Will be charging on the low pressure side of the system, but nothing will happen until I cant get the compressor running. Can You Help Me By...My A/c Had Been Blowing Hot And Cold For Months And Finally It Started Blowing Just Hot Air. Diagram female socket please. If you start putting refrigerant into the system it will turn on by itself you don't need to jump anything. Probably just needs a recharge. It's on one of the lines connected to the receiver/drier. Lift the locking tab on the plug before pulling the plug free.Place the leads of the multi-meter, set to ohms, on the prongs found on the pressure switch.


To test the fuse, turn a multi-meter to the ohms setting.

If only the pulley is rotating, the compressor clutch is having an issue, which could be stemming from several sources – a blown fuse, bad clutch oil, low-pressure lockout, or an open wire in the oil. Unplug the plug on the low pressure switch. Also, find out whether the clutch and the pulley are spinning. Thursday, March 31st, 2011 AT 9:32 PM Replace the fuse.Install refrigerant gauges to the refrigerant service valve, found on the large refrigerant line in the engine compartment. Turn the air conditioning system on. The meter should show continuity.

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