Automotive Air Conditioning Information Forum (Archives)

seattle_bryan on Fri July 08, 2011 7:37 PM

Year: 1986
Make: Honda
Model: Accord LXi
Engine Size: 2.0
Refrigerant Type: R134

Hello. I posted this at a Honda forum who in turn suggested I post here. Any help would be appreciated!


I have a 1986 Accord LXi 2.0 with Auto Trans and A/C. Don't laugh - for an older Accord, it's very nice and runs like a top! I'm replacing the A/C compressor due to failure and have a question about a part that bolts on to the side. First of all, it's a Nippendenso compressor. There is an aluminum block that bolts onto the side of the compressor. The compressor-facing side has four openings which are sealed by equal size o-rings. The out-facing side is where the A/C lines bolt on. When I had it off, it appeared to simply have passages inside (presumably to monitor flow?). When I took it off, I did not notice any moving parts or check balls.

The reason for my question: I'm wondering if something fell out of this block when I took it off and I simply didn't notice? I've put two compressors on the car (both reman). Both times, after reinstalling and re-charging, the compressor engages but builds no pressures (it holds vacuum perfectly and accepted the charge of R134 fine - it's been converted). I've flushed the system, replaced the receiver dryer and the expansion valve as well as the condenser. For the most part, the system is new! Note that it was working fine before the old compressor seized.

This part does not show on Honda's parts microfiche and the car is old enough that no one at the dealerships that I've talked to seems to know anything about it.

Does anyone out there have any idea what this part is, what it does, and its innards? I've eliminated all other possibilities as to why the system builds no pressure - other than this part - which no one seems to know anything about.

I've attached a picture. Any help would be appreciated!



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1986 Accord LXi 2.0 fuel injected Auto Transmission

TRB on Fri July 08, 2011 9:50 PM

If you are speaking about the block adapter on top of the compressor. All it does is adapter the compressor to your fittings. That compressor body is used on many vehicles. They make the adapters to fit the different vehicle hose assemblies. AS long as the pattern under neath matches the compressor opening your fine.

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seattle_bryan on Fri July 08, 2011 10:26 PM

I had wondered if that was the case but needed some assurance. I love the certainty of your response. Thank you!

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1986 Accord LXi 2.0 fuel injected Auto Transmission

mk378 on Sat July 09, 2011 9:38 AM

Compressor could be tested off the car turning it by hand with the block detached. You should be able to stop the outlet with your finger and have it build up pressure. Then try the same thing with the block attached.

What are the high and low side pressures when charged with the compressor engaged?

Edited: Sat July 09, 2011 at 9:42 AM by mk378