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04 Odyssey A/C Problem

Mobile785 on Sat April 25, 2015 5:19 PM User is offline

Year: 2004
Make: Honda
Model: Odyssey

I have an 04 Odyssey that developed an A/C problem. When Its hot outside 80+ degrees the A/C starts to work when the vehicle is first started and then after 5-10 mins to starts blowing warm air. While drive around it will occasionally kick back on and start cooling but only for a few seconds. However If I shut the vehicle off and leave it sitting for a 20+ mins the A/C will work again for another 5-10 mins. Now once the sun goes down and it starts cooling off outside the A/C will freeze you right out of the car.

I just put a gauge set on and had 40 on the Low and aprox 150 on the High. Out side temp was right around 80 degrees. When it stop working the pressures almost equalized at around 80+ on the low and a little under 100 on the High.

Once the A/C stopped working and the Low pressure started climbing the compressor disengaged but the secondary fan for the condenser continued to run. Someone told me it might be the expansion valve but that this would be the best place to ask.

If there is any more info you need please let me know.


Jag987 on Sun April 26, 2015 12:17 AM User is offline

High side seems a bit low for 80*, low seems a bit high. Sounds like it might be undercharged. Have the refrigerant recovered and weighed.

I bought a can of 134a at w**-mart that had a stop leak, oil, and dye in it. It also had a hose and a gauge, so now I'm an AC pro!

Mobile785 on Tue April 28, 2015 7:39 PM User is offline

Mobile785 on Tue April 28, 2015 7:42 PM User is offline

Ok here's the latest. I've evacuated the system, pulled a vacuum and refilled it to the 32oz that this car is supposed to take. The new problem is that is will only now cool when driving, if idling or in stop and go traffic the compressor kicks off. I just had it out in the driveway idling and it would not cool and the compressor would not kick on, the condenser fan was running. I had my wife hold it at around 1500RPM and within 20 seconds it kicked on and started to cool. Within 30-45 seconds of her letting off to go back to idle the compressor disengaged. So now does this point to an issue with a sensor or am I looking at a compressor issue?


HECAT on Tue April 28, 2015 8:41 PM User is offline



HECAT: You support the Forum when you consider for your a/c parts.


Mobile785 on Mon May 04, 2015 4:18 PM User is offline

Sorry for the delay in pressures but here's what I've got.

At Idle with front and rear A/C on High (compressor clutch not engaged) L= 79 H= 120

As soon at as I give it a little gas and take RPM's to roughly 1250 the compressor clutch kicks in and pressures go to L = 40 H = 220

If I take RPMs to 2000 L = 35 H = 220

As soon as I lift off the gas and go back to idle the Low side climbs 3-5 PSI and the High side drops to just under 200. Then anywhere from 10-20 seconds from returning back to an idle the clutch disengages and pressures slowly return the idle readings above.

Amb temp is 82 degrees


Mobile785 on Thu May 07, 2015 4:48 PM User is offline

Bump. Anyone? Any ideas? Today was almost 90 and the wife is nagging...

HECAT on Thu May 07, 2015 8:05 PM User is offline

35/220 it should be cooling. It is cooling right? Compressor is pumping, you have a control issue.


HECAT: You support the Forum when you consider for your a/c parts.


Mobile785 on Thu May 07, 2015 8:22 PM User is offline

Yes it does cool as long as long as I'm above 1000 RPM's as soon as I stop at a stop sign, red light, traffic, whatever it maybe, as soon as I'm below 1000 RPM the compressor clutch disengages within a few seconds and it starts blowing warm air.


Dougflas on Thu May 07, 2015 10:11 PM User is offline

This reminds me of the Toyota rpm sensor problem.

mk378 on Fri May 08, 2015 8:25 AM User is offline

The computer usually has an anti-stall feature that if it thinks the idle is going too low it drops out the A/C. Is the idle really at spec rpm?

Mobile785 on Mon May 11, 2015 4:21 PM User is offline

Problem has been resolved. Today I hooked up the OBDII reader to see if I could pull up any useful info and found my problem. Coolant temp was getting up to 241 degrees. Once the temp went above 240 the A/C Clutch would disengage. Once I gave it a little gas the temp would drop well below 240 and the compressor would kick back in. I checked the coolant level and it was down little bit, so I topped it off and will keep an eye on it.

The odd part is the dash gauge was steady where it always is almost in the middle of the gauge when the car gets warm. It never crossed the half way point. The only reason I caught on to this was using the reader and seeing the temp spike. So now I need to figure out why my dash gauge never goes past half way. If it had I would have caught onto this a long time ago.

Also since it didn't take too much coolant, maybe 8 to 12 oz, and then dropped once i brought up the RPM's I'm hoping its not the Water Pump. I just replaced the Timing Belt and Water Pump a year ago, it wasn't too difficult to do but I would think I water pump would last longer than that.


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