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I put gaz 134a in a/c circuit and i don't have leak.The compressor doesn't start when i put a/c on and fan on.I by-pass the relays for a/c compressor and the fan a/c and it run...What's the componnent drive the relays ???

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You have a bad pressure switch are ban control if your getting voltage to comp the clutch is out

Posted on Jul 03, 2009

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3 Answers

2003 ford focus no cool air is blowing out. Could it be the evaporation cord?


Make sure your blower fan is turned on and is blowing air. When you push your a/c button the yellow light should come on. If it is not blowing cool, it could be several things. Low on 134a or the control that has the a/c button on it could be bad or blown fuse, bad compressor, etc. If the air is cool but not cold the 134A is low. If it is still blowing hot, check and make sure that the clutch on the compressor is locked in. It most likely is not. Check ac fuses and ac relay, if they are good, check the 134a ,if low, refill it. This should fix it. Remember that if the a/c clutch is not locking in, you cannot add 134a because of no circulation.On some vehicles, if it is completely out of 134a, the relay will not trip and you will have to bypass the relay to provide power to the compressor to fill it. If you do all of these and it still does not work, you will need to take it to a professional. If you need to, reply back and I will give you more possibilities.(I think that you mean evaporator coil)

Jun 03, 2014 | 2001 Ford Focus

1 Answer

Radiator fan relay control circuit 2002 dodge ram


low charge pressure of 134A Coolant will not let the fan or compressor clutch engage.

Apr 01, 2014 | Dodge Ram 1500 Cars & Trucks

1 Answer

Compressor and fans do not turn on until rev engine


I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

Jul 24, 2012 | 1992 Buick Regal

1 Answer

LG Fridge LSC26945TT compressor getting to hot and not cooling


if it's not cooling unplug it so you don't damage the compressor,hopefully you just have a bad overload and relay,it's plugged into the side of the compressor,with the machine unplugged remove the bottom back panel,look at the compressor,remove the cover on the side of compressor and remove the start device or ptc assy. call your local parts store and give them the model number and buy a new start device for your machine.if you can hear a clicking sound every once and a while and the compressor is hot change this out first,if it still doesn't start then you have a bad compressor and will be in the market for a new fridge if the compressor is running take everything out of the freezer,remove the back inside wall of the freezer and check the evap coil,if the coil is all iced up you have a defrost problem,if the evap coil doesn't have an even frost pattern covering the whole coil you have a freon leak.if you have a freon leak you'll have to replace the fridge..hope this helps

Jul 04, 2012 | LG Refrigerators

1 Answer

Fan works, but not AC cooling


start with checking a/c pressures is compressor cycling? does it have electric cooling fan? it should come on with a/c. usually there is a low limit/high limit switch. if pressure is low, say below 22psi @ low side port, switch will cut compressor. A quick electric "jump" of low limit switch will confirm clutch,compressor operation,but if pressure is low you may want to add freon. know your a/c system r-12 or r-134a,iv'e found converting to r-134a cheaper than purchasing r-12. r-134a takes a special pag oil and should not be used/mixed with ester oils. i could say more on subject but that's a start,of course always wear safety glasses and approach high side port with caution,which most newer cars don't have. thanks

Jun 27, 2012 | Heating & Cooling

1 Answer

Where's the fuse for the AC on 98 Olds 88?


So what does the fuse that blows, protect?

You need a wiring diagram & start to test
the components most likely to cause a high
current draw & blown fuse.

Don't keep replacing it.

You know the fan control circuit works, but the
compressor doesn't stay on. Did you monitor
the compressor as the fuse blew?

May have a module for compressor & fan
If so one side failed
The compressor clutch could be bad

May 24, 2012 | 1998 Oldsmobile Eighty Eight

2 Answers

Po 480b cooling fan relay 1 control circuit what exactly does that mean?


Lets take a look at the relay first. This is a device that takes a small amount of voltage (computer signal), and passes it off (through a magnetically induced switch) to a higher voltage- like a relay race.
The circuit would consist of a power source (battery), wiring, a switching device (sensor and computer), relay, fan, and ground. According to the trouble code, the indication is that something along this circuit is defective or malfunctioning.
For a do-it-yourself diagnosis, first you wanna check the fan to see if it can free spin. This will confirm that it isn't siezed. Next you wanna start the vehicle, and let the temp gauge go to halfway. The fan should activate. If it doesn't, turn on the a/c. If this cuts the fan on, then the relay is working. If it doesn't suspect a faulty fan relay. In the event that the a/c does cut the fan on, then suspect a faulty coolant temp/fan switch.

Sep 20, 2011 | 2003 Chevrolet Impala

1 Answer

My Vinotemp VT52SN stopped cooling. I was away from home for a few days and when I came back the fan was running and the temp was stuck at 62 degrees. I had it set at 54 (and lower)... the fan runs and I...


How To Test the Compressor Relay The compressor relay's purpose is to start the compressor. A faulty relay can result in the compressor failing to cycle on. The relay is accessed from the lower rear of the refrigerator the relay is located in the terminal box which is located at the side of the compressor.

Before testing a compressor relay, unplug the refrigerator to avoid an electrical shock hazard. Also, if the compressor uses a capacitor, it must be discharged first to avoid the risk of electrical shock.
Beneath the terminal cover is found the compressor relay , overload protector and the electrical terminals of the compressor motor.


Remove the compressor relay by pulling it straight off from the compressor.


Pull the wire off of the side terminal of the relay. It is connected with a slip on connector. Firmly pull the connector, do not pull on the wire. You may need to use a pair of needle-nose pliers.
Inspect the connector and terminal for corrosion. If either is corroded they should be cleaned or replaced.
There are two types of relays you may encounter, wire coil and solid state. If the relay has an exposed wound wire coil it can be tested for continuity. Otherwise, the relay is of solid state design and requires specialized equipment for testing.

Jul 08, 2011 | VinoTemp VT-52SN Stainless Steel Wine...

2 Answers

2001 Leganza air was working fine. Now wont kick in at all. Relays, fuses are all ok


hello 1st need to put gauge on the ac system to see what pressure you have in your system most likely you got a leak of freon or r134a not enough gaz pressure in the system to start the compressor dye need to be install to find the leak

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