2005 Toyota Camry: AC will not Turn ON?

A/C not coming on and A?C power also not coming up.
The compressor not turning ON.
In this cases first of check the Magnetic relay.

Put a gauge on the low side and jump the terminals at the magnetic relay to turn the compressor on.If it turns ON,then magnetic relay is faulty.To confirm the relay issue before buying new relay. Try swapping horn relay with Magnetic relay and see the difference.Pull the horn relay out and stick it in place of the magnetic clutch relay to see if that makes any difference.

This Car model System has Manual AC controls.
If the magnetic relay is checked and inspected ok,then other possibility can be faulty Control panel itself.
But before that check the Fuses that controls the A/c system.


In the fuse box under the hood that has the magnetic clutch relay in it you will find four fuses three of which are for the headlight system and one is a 10 amp AC fuse Check this 10 amp ACC fuse is good and does it have 12 V to it. This fuse is the main power supply to the control unit for the light in the switch and the functions of the air-conditioning system in this panel.

Also double checked the 10 amp ECU – B fuse in the left side of the instrument panel. This is another main power supply to the control unit.

If All fuses checked out then, the next step is going to be doing pin by pin voltage tests and resistance checks at the connectors at the back of the control unit.
We know the fuses are good but you have to confirm that the 12 V are getting to the pins at the back the control panel and the control panel itself has the specific ground path with no resistance. If you have power inputs to the back of the panel and your grounds check good then the panel is no good.
The control panel is white module located between the glove box and the center dash components.

If the pin out voltage is also checked ok and all connectors back of control panel looks intact then problem is with AC Amplifier.
It has to be tested and replaced.

This details will help.
Thanks.

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2002 Toyota Prius: A/C Green Light Blinking?

The A/C functions and runs for few minutes then Stops blowing cold air and Green light starts flashing.

The Compressor in this Car model Gets operated by Magnetic clutch.

The A/C light flashes because the Magnetic clutch is not spinning the compressor when it is commanded to. This can be anything from a bad relay to a wiring issue.
Or it can also be faulty Compressor or Magnetic clutch itself.In some cases it was faulty relay.


Swap the CLR MG relay with the horn relay and see if the problem goes away.
If it goes away then relay is the issue.But if problem is same as before then by pass the relay and give direct 12 volt to clutch and see if the compressor operates fine.If it operates then its short or loose wiring.But if compressor still not operating as required,then its faulty/ weak compressor.Should be tested by professor CAR AC repair tech before replacing.

This details will help.
Thanks.

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2008 Toyota Camry: Air Conditioner Not Performing well due to Faulty Ambient Temperature Sensor?

Yes this problems are seen in some cases but its rare issue.

Under normal conditions no the ambient temperature sensor is not a major player in the performance of the air-conditioner. It is an input to automatic climate control systems but does not determine the overall performance of the air-conditioner.

If you have pushbuttons and a digital readout on your climate control system then you have Automatic Climate Control System.

If your vehicle has automatic climate control there can be an issue in the actual control unit itself which could affect the display. I have seen some of these display units fail and it will give you  two dashes.
The 2 dashes "_ _" on Temperature display panel.


The automatic climate control system is designed to give you a more consistent and responsive, cool air or hot air depending on what is selected, then temperatures. It should still cool to about 35 or 40° at the center vents with the air-conditioner at Max cold. The outlay climate control unit itself is what determines how hot or how cold the air is coming out of the vents. When you have it dialed down to maximum cold temperature the air-conditioner should still produce cold air sufficiently. The ambient temperature sensor is just a minor input to tailor the climate inside the vehicle when using either the air-conditioner or the heater.


This details will help.
Thanks.

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