Question about 2003 Honda Odyssey

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AC blows warm. fan + compressor don't seem to engage.

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The system could be low on refrigerant. The A/C pressure switch will not let the compressor run if the system pressure is below 28psi or above 455psi to protect the compressor from damage. At low pressures not enough oil (mixed in with the refrigerant) will circulate, and at high pressures, the compressor seals will likely blow. You can get a set of A/C manifold gauges for R-134a and check the system pressures yourself or get a shop to check it and possibly add some R-134a. If the system pressure checks good, then the A/C pressure switch, the compressor clutch, or some relays will need to be checked.

Posted on Feb 05, 2011

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When you possibly need freon never add it with out a gauge there is a certain amount of r134a you should charge the system too never just add a can here and there cuz its not cold adding too much will put pressure on the system and may damage it over time, also adding freon without a gauge can result in the a/c lines blowing off (when I say blowing off I mean exploding basically)and usually ruining them. When adding freon go to your local auto store and have them look up the required amount of freon your system will hold or the dealer. Most cars and trucks hold an average of 24 to 36 ounces of freon,so if your on your 4th can of freon you might wanna double check before you bust something. Also volume relates to temperature and increases and decreases as temperature does. When you are looking a an a/c gauge the pressure inside the a/c lines is measured in PSI. Also you should not charge a system when the outside temp is under 65 degrees because the freon which is a gas does not show needed pressure changes to charge a system correctly. The lowest pressure reading would be at 25 psi at 65 F and the highest should be 55 psi at 95 F to 110 F it is easiest to charge a system when the outside temp is below 85 degrees F because it is easiest to see the change in PSI when it is under that temp. You then would add freon to the low side port which is usually on or close to the a/c accumulator with the A/c blowing on max and the compressor a/c clutch engaged, add freon till the correct psi is shown as it relates to the outside temp.
For example the gauge would read some thing like this.
75 F = 40psi
80 F = 45psi
85 F = 50psi
90 F = 55psi

Posted on Jun 12, 2013


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Posted on Jan 02, 2017

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SOURCE: ac compressor won't engage

the ac compressor has a safety switch built in it to keep it from coming on if the liquid level of freon is low this keeps the compressor from overheating and going out all together. try hooking up a can of R134a and turn the can upside down so that the liquid flows in and the compressor should kick in with almost one full can.

Posted on May 11, 2009

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SOURCE: ac blow warm air

need to have a set of gauges on it and read the low side and high side to see if pump is weak that year compressor i think is on the bottom passenger side ,it is not a good desigh pump may be weak

Posted on Jun 30, 2009

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SOURCE: blows hot air clutch does not engage

you either have a power loss problem but more likley your low on refrigerant. if its low, there is numerous pressure sensors that will not allow it to engauge to protect the compressor. you got to put a gauge on it. standing system at 80"F should have about 80-90 lbs. standing pressure.

Posted on Aug 25, 2009

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SOURCE: ac blows warm

The flap that controls the air flow from inside circulating to AC has broken off. This is a manufacturer defect, the sunlight comes in through the vent and dry rots the flap and then it falls into the fan which can either not blow ac or blows warm engine air. Go under the truck, remove the 3 bolts, put your hand up there and yank the flap out. Once the flap is gobe the fan can spin.

Posted on Jul 19, 2010

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SOURCE: 2008 Honda Civic dx rebuilt AC compressor always on regardless of controls

OOPS ! Now, it sounds like the A/C relay is constantly on. In the power distribution box by the battery, try swapping another relay for the A/C relay (which turns the compressor on), and see if it now stops. If so, buy a new relay. Good luck.

Posted on Jul 12, 2012

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My 2010 Chevrolet Aveo LT is making a clicking sound when I turn on my AC, but I turn it off it stops- occassionally blowing cool air but then turning hot. Any suggestion for an easy fix without breaking...

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