Question about Toyota 4Runner

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1995 Toyota 4 runner air conditioner does not work. Turn on swith and compressor does not engage. Have check all fuses, they are fine. How do I touble shoot problem? Will a toyota compressor not come on if it low on freon?

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  • coatings193 Jul 23, 2009

    This vehicle is a ranch vehicle and cannot be driven on the highway. The closet shop is 12 miles from the ranch. The tow round trip is about $175.00 So how do I begin to touble shoot problem?

  • coatings193 Jul 23, 2009

    You have a fan switch and a A/C switch. You can turn fan swith on and no problem. Blows hot air. When you turn A/C switch on, light turns on on swith but compressor does not engage. I have checked all wiring and fuses and cannot find any problems. The vehicle busted into our property and was abandoned, we found it about 1 year later. Vehichle runs great, Sherrif says we can keep it but would like A/C in south texas when it hits 106F. Have acces to 136a freon and gages but do not no where to start.

  • coatings193 Jul 23, 2009

    Yes, all belts are turning, compressor is turning but clutch is not engaging. I had found the ports to put and/or check freon, one cap with a H and one cap with a L which I assumed was high side and low side. Can you give me a step by step on adding freon and oil ( if needed) to system along with pressure settings?

  • coatings193 Jul 23, 2009

    This helped me greatly.

  • coatings193 Jul 23, 2009

    This helped me greatly.

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4 Answers

So when you turn on the A/C switch inside the vehicle does it blow any air (hot or cold) out at all? When was the last time is was refilled with freon? Looking under the hood with the vehicle running, do you see the rubber belt turning the A/C compressor without any noise or problems? Do you need to press a seperate button after the fan switch is turned on (my 1994 Toyota Camry is like that) to make it cold inside the vehicle?

Posted on Jul 23, 2009

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  • Anonymous Jul 23, 2009

    So the compressor is working and spinning...the A/C belt under the hood is spinning the compressor wheel, correct? If it is, then you most likely just need to recharge the system with some new R134...if the air is coming out of the front vents then it is being delivered...I lived in Sealy, Texas back in 1990-1992 so I know what you mean about the humidity!



    The recharge service ports are located on the high and low side air conditioner lines near the firewall where the lines go into the passenger compartment...Look for them on the right side near the engine valve cover, they may have plastic covers on them which you will need to remove

  • Anonymous Jul 23, 2009

    The compressor will come on as soon as it gets pressure from the freon source..You can force the compressor to run by disconnecting the electrical connector to the clutch and then applying battery voltage directly to the clutch connector

  • Anonymous Jul 23, 2009

    Wal-Mart sells a variety of A/C recharging kits ranging from $10.00 - $35.00.
    Get a kit that has a meter displaying the pressure...Normal pressure ranges between 25 - 45 psi.

    After you add the freon using the recharging kit, go for a drive and feel if you get any cold air. If you don't or if you did not need to add freon in the first place, then most likely the AC compressor has failed. A used or rebuilt compressor would be less expensive than a new one. Installation would probably take a professional a little over an hour.

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After you turn the fan switch on, you turn the A/C switch and its light turns on but the compressor does not engage, right? In that case you either have a pressure problem (lack of freon - pressure switch is preventing the compressor to start) or you have a failure in the A/C amplifier circuit board. This board is located behind the glove box. Basically it receives 12V signals from fan and AC switches and energizes the line of the magnetic clutch and the condenser fan relays.

Posted on Aug 21, 2009

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Well you can find witch wire at the compresor clutch is ground and hot the other side to determen if clutch is oprating if it is then you can go to your local part house get some freone hook up to low port side witch is the smaller of the two and start car and open can it will go in if it is not to low if its to low you will need to pull the air out of system with vacume pump you can rent these at rental place if compresero come on after freon you should be ok only ad small can at a time do not over fill hope this help redoil.

Posted on Aug 06, 2009

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The ECM controls the A/C system in your vehicle.
And yes - there is a pressure switch that will not allow the compressor to start.
Instead of throwing money blindly at the problem - a quick diagnostic test performed at a dealer or independent mechanic will pinpoint the failure for you.
It could be anything from a bad compressor clutch - to a pressure switch - to a failing ECM - and/or a bad switch.

Thanks for using FixYa!!

Posted on Jul 23, 2009

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Posted on Jan 02, 2017

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