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Old 16-09-2020, 12:58 PM   #1
Junior Member
Join Date: Jun 2019
Location: Bangkok
Car: Astina BA 1994 + Lancer Cedia 2003
Posts: 26
Aircon problem over 4500 RPM

Hi guys,

I'm having some aircon cutoff issues in my 1993 Astina BA (1800cc)

It works fine when sitting in traffic and driving below 4500RPM, but as soon as I go over 4500rpm, air starts to get warm. I live in Bangkok, so cannot survive without a good a/c. Even when it's working, it's not very strong.

I've already replaced the compressor (stock rebuilt one) and pressure tested it, changed gas, changed o-rings and cleaned the whole system. Also I'm running a HKS F-con pro 3.24 ECU, so I don't have high rpm a/c cut-off via the ECU.

I saw in the Miata forum that some people recommend to change to sanden 508 compressor. https://forum.miata.net/vb/showthread.php?t=319741

Is this something you guys have experienced as well? Any solutions?

Thanks for the help guys!

Last edited by danu91; 16-09-2020 at 01:02 PM.
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