Can anyone tell me where the high and low sides are for the a/c. I need to recharge my system. Thanks.

 

High is near the top of radiator on driver's side and low is near center of engine on large hose connected to the compressor. An adapter may be necessary to access unless you've already had a retrofit. Download the 91 manual form http://www.hondahookup.com/manuals/. This will show you the charge locations.

If system is completely discharged, a leak location and repair should be performed first. Charge is by weight, but and about 85-90% of R12 charge if you're using R134a.

If this is a retrofit, you needto flush the condensor and evaporator, replace all orings including evaporator expansion valve, install new receiver/drier, new lubricant (8oz) of polyester or PAG, vacuum for 1/2-1 hr to dry and confirm no leaks, and recharge as suggested above. No short cuts on AC work well for long.

good luck

 

I was planning on keeping it an R-12 system. My pressure switch is leaking and i need to replace it. Is there anything else i should replace while im doing this a/c work? Thanks.

 

W/ system down, I would replace all orings becausethey age and are a source of leaks. I would include the condensor connnections, evaporator and all orings on the expansion valve and thermal sensor. I had two Accords that developed evaporator leaks due to age of orings and a type of aluminum-brass corrosion that created a powder and displaced the oring. New reciever/drier; < $30 usually.

If you've never replaced the blower, you might consider a new blower as you are near the natural life, and it's easy to remove w/ evaporator out. Blower is non-repairable and a new or rebuilt unit is best buy. They are a bit pricey.

Look closely at the compressor main shaft seal for evidence of leaking (oil/dirt accumulation and ring around the clutch on overhead and adjacent parts). I had one go out on my 94 EX and installed a new seal.

Blow all old oil from condensor and drain evaporator when out. If you remove the compressor, drain it as it usually has about 1/2 the oil.

Install new orings. Install new receiver/drier and load new mineral oil ( ~7-8 oz) into compressor, condensor,and receiver drier. Anywhere you can install will work.

Use a vacuum pump to pull a good hard (> 29" hg vacuum), and check for leaks by closing manifold valves. Vacuum should hold w/ hardly any change for at least 15 minutes and hopefully longer. This is your final check before committing to charging. Charge w/ spec amount (32oz?) of R12.

I've found (http://www.autoacforum.com/) to be a good source of information and Arizona Mobile Air a good source for parts; compressor shaft seal, oil, tools, etc. Ybay is a great source for new and used parts also.

Enjoy cool AC for several more years!

good luck