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Discussion Starter #1 (Edited)
Hi all !!! :)

I just found this site in searching for help with a question I have in regards to the A/C system on the vans. I just recently sold my 2003 Pilot and now have the 04 odyssey with 114k on it.
I have noticed a huge difference in the A/C on the van as it is not supplying the same level of cool air as the pilot did.
In this van I get different levels of cool air when idling and driving on highway...
There are no issues that I can see with the blower and controls but when I put a temp gauage on the front vent with recirc on at cooloest settings while idling the air temp from vents will be around the 12-13 C or 55 F range. When the same is done at highway driving the air temp will get down too 11 - 12 C or 51.5 F range. I should note that the rear air is much more consistent and somewhat cooler all the time no matter if idling or driving???!!
At idle with the settings at coolest(full auto) and recirc off the air temp blowing from vents will blow out at 15-16 C or 60 F temp. No lower... no matter how long it's been idling for. Then when you start driving it will cool down some to 12.5 - 13 C or 54.5 F .
Also I put a gauge on the line to test the pressure in the system and it registered in the good range but on the lower side.
The compressor runs continuously with the settings turned to coolest in full auto mode... Just had the belt for A/C and cabin filter changed too with no change..

Ok I went out to run an errand today and the air blowing out the vents was completely warm on the way to the store. I turn the van off and go in to store and when i came out and started up again it was so cold within minutes I had to turn the thermostat up to a warmer temp.???
Is it possible to get a blockage in the lines?? or is there a sensor....????

Thanks for any help.
 

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<bump>

I have a very similar issue with my 2000. Sometimes A/C will blow cold air for a while, then it gives up and blows ambient temp air.

I just bought a gauge set. The van was warmed up and I let the A/C run until pressures were stable. I have front & rear A/C but just the front was turned on, rear turned off. Readings were:

Low Side: 36psi
High Side: 215psi
Ambient Temp: 76F

The Service Manual chart is a bit confusing for a newbie. Can anyone tell me if those readings are OK?

Thanks, Andy
 

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Take to an A/C specialist to check pressure, leaks and level of refrigerant, etc.
 

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Thanks for the suggestion, and it may come to that in the end, but my mission is to figure this out myself, with help from the Internet of course :) Hence the purchase of a manifold gauge set.
 

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leecea said:
Thanks for the suggestion, and it may come to that in the end, but my mission is to figure this out myself, with help from the Internet of course :) Hence the purchase of a manifold gauge set.
Completely understand your determination. A/C specialist I am not, hence my recommendation. Post back your results.
 

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I had this same problem on my '97 Civic and it took me quite a while to find it. Turned out to be an intermittent electrical open-circuit in the compressor clutch coil. I spliced an on-board light bulb into various points in the electrical circuit, all the way from the controls on the dashboard to the connector right at the compressor clutch, to finally determine this.

When you are not getting any cool air, get out of the vehicle and pop the hood to see if the compressor itself is operating (the center portion of the clutch on the compressor should be spinning).

Just one possibility to check.
 

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you should make sure your condenser is clean. it is natural for them to get dirt and bugs in them. this makes it difficult for it to let off all the heat from inside the van. as the van drives faster, more air moves through it and it sometimes will seem a little better. you can either clean them with compressed air, or a garden hose. just make sure not to flatten the "fins" on it.
 
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