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4th gen A/C question..

 
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Old 05-29-2008, 07:10 PM
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4th gen A/C question..

When did honda start converting the prelude a/c into R134 over R12.. I have no clue .. I need to recharge mine but not sure if it's still stock or the new R134. Also Does anyone know or have a diagram of the low and high pressure hose?
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Old 05-29-2008, 07:35 PM
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did you look in the 4th gen resource guide????
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Old 05-29-2008, 08:19 PM
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clere will become famous soon enoughclere will become famous soon enough
Should say on a little metal tag in the engine bay.
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Old 05-30-2008, 09:05 AM
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The 4th gen preludes are R-134a

Don't try to charge your system unless you have the proper knowledge and tools to do so, because it is not only a pain in the a**, but without knowing what your doing, you could end up in some big trouble...

The high pressure and low pressure fill spots will have caps that have an "H" and an "L" on them. From the looks of it, they should be pretty close to each other towards the front of your car, probably right in the vicinity of the receiver/dryer.

Good Luck!!

Also, the capacity specifications for the 1993 Prelude with the 2.2L DOHC V-Tec is 21-23 oz. DO NOT OVERFILL IT!!!

Last edited by OEM~KaOs; 05-30-2008 at 09:06 AM. Reason: added capacity specs
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Old 05-30-2008, 10:01 AM
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clere will become famous soon enoughclere will become famous soon enough
Not true Skterelement03....my 4th gen takes r12.
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Old 05-30-2008, 01:51 PM
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Quote:
Originally Posted by clere View Post
Not true Skterelement03....my 4th gen takes r12.
That's weird, I looked it up on my All Data here at school and it said R-134a... hmmm, maybe the different models are all different, there were 3 different engine types for the 1993, I just picked the one that was the DOHC V-Tec, never checked the other ones.

Ok, I just looked thru All Data again -

The 1992 Model Preludes ALL take R-12, but the 1993 and up models all take R-134a, so it seems to me that they switched over in 1993.

Last edited by OEM~KaOs; 05-30-2008 at 01:55 PM. Reason: more info
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Old 05-30-2008, 02:10 PM
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In 93 Honda switched the prelude to R-134a
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Old 06-01-2008, 03:31 AM
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Sweet that means all H22's would be R134 correct? Since the 92(what mine is) didn't come with H22's, but only newer ones.
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Old 06-05-2008, 08:40 PM
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Ok here's the update on my a/c system diagnose.. I bought a gauge and hook it up the low pressure line to see if it's still full and it said it is.. Anyways, I had an old thermostat laying in the garage so i decided to give it the old school test to see what the result is.. Outside temp is 70-71 degree..Car is fully warm up.. I had the blower on WITHOUT the A/C switch on and it was blowing out about 1-2 degree warmer on cool setting.. Now with the A/C switch on, i waited for about a good 5-7 minutes and my thermostat drop down to about 57 degrees.. I also hear my compressor kick in when the a/c switch is turn on.. Weird thing is that i don't see any water drips outside under the car after 10-15 minutes with the a/c on.. I don't see any water leakage or puddles on the passenger side floor either.. Is this normal? Anyone? I guess R134 is not as cold as the R12..
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Old 06-05-2008, 10:59 PM
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Quote:
Originally Posted by niteowl93 View Post
Ok here's the update on my a/c system diagnose.. I bought a gauge and hook it up the low pressure line to see if it's still full and it said it is.. Anyways, I had an old thermostat laying in the garage so i decided to give it the old school test to see what the result is.. Outside temp is 70-71 degree..Car is fully warm up.. I had the blower on WITHOUT the A/C switch on and it was blowing out about 1-2 degree warmer on cool setting.. Now with the A/C switch on, i waited for about a good 5-7 minutes and my thermostat drop down to about 57 degrees.. I also hear my compressor kick in when the a/c switch is turn on.. Weird thing is that i don't see any water drips outside under the car after 10-15 minutes with the a/c on.. I don't see any water leakage or puddles on the passenger side floor either.. Is this normal? Anyone? I guess R134 is not as cold as the R12..
Hate to break it to ya, but no, that temp. reading is not normal. 57 is too warm for the thermostat reading, it's supposed to be right around 45, on average, but all cars are different. I have yet to see a spec that goes ever 50 EXCEPT on a ford, where their spec ranges from 43-54 degrees... but thats ford for ya you wouldn't happen to have an infared thermometer gun or a temperature probe would ya? because the thing to do, if i remember correctly, is check for temperature readings at the compressor, the reciever dryer and the expansion valve right by the evap (should be right next to the firewall) check for restrictions that would cause the temp to not be as good. Also -- do you have an identifier? this will tell you your percentage of refrigerant. It may say it's full on the gauge, but that just means the system is full, the identifier will tell you what it's full OF
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Old 06-06-2008, 01:48 AM
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What happens if you do overfill it? Because I put almost a whole bottle into my system today because it was low...
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Old 06-06-2008, 09:22 AM
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Quote:
Originally Posted by pyromenger View Post
What happens if you do overfill it? Because I put almost a whole bottle into my system today because it was low...
over filling it is just as bad as opening the system to the environment, lol. You need to evacuate your system ASAP, then refill it to the specification required for your car. Overfilling it can cause the system to be too pressurized, which is not a good thing and can ruin your compressor.
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Old 06-06-2008, 10:38 AM
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when you say restriction, what do you mean?
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Old 06-06-2008, 04:31 PM
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Quote:
Originally Posted by niteowl93 View Post
when you say restriction, what do you mean?
Like, if pressure builds up before the expansion tube, or there is a blockage somewhere in the line. The temperatures would all be way out of spec, most of the time, and you would be able to generally pin point the area and problem
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Old 06-07-2008, 03:00 PM
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Well it's about 85 degrees out today and i've tested out the system and it does get somewhat cooler on the inside of the cabin of the car.. Also there are water puddles under the car ( on the outside) so i'm thinking that's good.. Anyways, a few things kind of bother me.. I've had this problem for a while but can't just seem to track it down. I've also tried switching out for another unit and the same thing happens so i don't think it's the unit that's faulty (Climate control). The problem is when i switch to the low, med, high setting on the fan/power mode. The only time it blow is on the high setting. Also, sometimes the different vent setting switch doesn't work (i.e. feet, feet + dash, dash). In addition, seems kind of weird but when i switch the fan/power setting to low, med, high setting with the a/c switch turn on, the compressor is turn on but only blows on high. You know how you can hear the difference when it's using power off the car.. Well, that's what i hear. I don't know.. Anyone want to take a crack at this? I'm thinking
it might be a connector somewhere before the climate control unit but the question is where and which ones. Does anyone have a diagram/map of a/c connectors?
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Old 06-07-2008, 04:32 PM
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I did some research and it saids that the low line is supposed to be cool when the a/c is running and the high line is hot.. I check and the low line is warm.. Like i said from the above reply post that the cabin is a little cooler and it does drip water under the car.. So anyone? Any clues? Something stuck somewhere along the line? I check the condenser and it seems fine, no debris.. Expansion chamber clog?
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Old 06-08-2008, 02:07 AM
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Your problem with the vents not working and the fan only blowing on one setting is a problem with the electrical circuit, The blend door is getting stuck, which is why the different modes dont work i.e the vent, floor, etc... the reason you are only blowing high is because there is an open in the switch for the different speeds which is causing the circuit to find the shortest path to ground, which is thru the high side. As for your low side being warm, all i can think of is restriction, but thats off the top of my head. I dont have All Data anymore so I cant help you out with the nifty diagrams, sorry, if you would have brought this up about a week earlier I would be all over it, lol.
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Old 06-08-2008, 02:10 PM
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Quote:
Originally Posted by Skterelement03 View Post
Your problem with the vents not working and the fan only blowing on one setting is a problem with the electrical circuit, The blend door is getting stuck, which is why the different modes dont work i.e the vent, floor, etc... the reason you are only blowing high is because there is an open in the switch for the different speeds which is causing the circuit to find the shortest path to ground, which is thru the high side. As for your low side being warm, all i can think of is restriction, but thats off the top of my head. I dont have All Data anymore so I cant help you out with the nifty diagrams, sorry, if you would have brought this up about a week earlier I would be all over it, lol.
Hey thanks for the info man.. Atleast it's giving a point to start..
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