Question about Toyota 4Runner

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My a/c light is blinking and not blowing cold air. 2003 4 runner

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The most common reason for the AC light to blink is that the system is low on refridgerant, have the system pressures tested to confirm this is the problem..

Posted on Nov 12, 2009

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Posted on Jan 02, 2017

  • 21 Answers

SOURCE: A/C problem on 2003 Toyota 4 Runner

Bad a/c relay , belt slipping,or bad speed sensor in compressor

Posted on Apr 21, 2010

bestdarngood
  • 3037 Answers

SOURCE: AC doesn't blow cold air on 95 4 runner. Can I check compressor

Well, for one with the truck idling, the RPMs should increase every time that the clutch on the compressor engages. You should be able to see it engage and disengage and the RPMs will change accordingly. If this isn't happening then you need to determine why. Have the A/C blower on low when doing this.

Posted on May 29, 2009

catbob007
  • 70 Answers

SOURCE: 4 Runner Blows hot air on driver's side

something fell down defrost vent

Posted on Jul 27, 2009

  • 104 Answers

SOURCE: Air Condition Hot Air

there is a updated ac relay for that, go to your toyota dealer and buy a new mgt relay its located in the fuse box in the engine bay on the drivers side.

Posted on Aug 25, 2009

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Toyota corolla 2003 air conditioning green light blinking and cold air not blowing


You've figured out by now the blinking light means the system has a problem. You'll need to find out if the system is low on freon or if a relay or electrical part is failing. The cooling fan could also be failing to come on, which would make the high side pressure exceed the limit and shut down the system.

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A couple of days ago my door lock would not work, then my a/c stopped blowing cold air. The light was blinking. The next day the light wasn't blinking and it was working again, and then stopped. Then it...


Sounds like there might be a bad ground or wire connector.If you are not good at chasing wiring I would take it to some one who is . Good luck

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have you tried refilling the aircon gas ?

It goes empty after a while.

The reason for cold then not cold is because it is a system that works in reverse of your radiator.

The gas cycle through the system. goes through the radiator of the the aircon system (not the same as the one for the engine). there is extracts the heat out of the air. the air is now cold and pushed into the car.

the warm aircon gas the made cold further along the system but the dont have enough in the system.

imagine athletic ruynning around a track. all 20 are bunched up together. there is w spot light in the centre of the infield shining on you.

the track is your aircon system.
the spot light the air coming into your car.
You are the car
The athletes are the aircon gas.

When they run between you and the light the air is cooled off and you are getting cold air.
now of goes the air (athletes) around the system and till they come along again you get hot air.

Now fill up the aircon system (put more runner on the track and voila, less light reached you cos there is more gas in the system.

However if you refill it and after a day or even just a week it the same again you have a leak in your system and will need to have it looked at by someone specializing in car aircon repairs.

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1 Answer

A/C problem on 2003 Toyota 4 Runner


Bad a/c relay , belt slipping,or bad speed sensor in compressor

Apr 13, 2010 | 2003 Toyota 4Runner

1 Answer

Air Condition Hot Air


there is a updated ac relay for that, go to your toyota dealer and buy a new mgt relay its located in the fuse box in the engine bay on the drivers side.

Aug 18, 2009 | 2003 Toyota Camry

1 Answer

4 Runner Blows hot air on driver's side


something fell down defrost vent

Jul 27, 2009 | 2003 Toyota 4Runner

1 Answer

AC doesn't blow cold air on 95 4 runner. Can I check compressor


Well, for one with the truck idling, the RPMs should increase every time that the clutch on the compressor engages. You should be able to see it engage and disengage and the RPMs will change accordingly. If this isn't happening then you need to determine why. Have the A/C blower on low when doing this.

May 29, 2009 | 1995 Toyota 4Runner

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