smule Posted 10November, 2014 Report Share Posted 10November, 2014 Scored some hychill through a friend who also has the equipment to regas but has limited experience to a gassing a fleet of modern trucks that he services. My car being an 84 sports a Nippondenso compressor, at some point in its life has been converted to 134a and has a pressure switch wired in. I identified the low pressure point on the compressor and removed the pressure switch to find the high pressure point, however if i attach the hose to the high point and run the air con the compressor wont kick in ( i can bridge the wiring to overide and engage the compressor) So my question really is, do i remove the pressure switch when im trying to gas or is there an alternative service point, and if i do remove the switch then how do i stop gas/air escaping? Am i way off track with trying to work this out ? https://www.flickr.com/photos/119442573@N04/15567857960/in/photostream/ https://www.flickr.com/photos/119442573@N04/15754223962/in/photostream/ Link to comment Share on other sites More sharing options...
Peter M Posted 10November, 2014 Report Share Posted 10November, 2014 Smule, If you post some photos of your actual compressor and the service ports plus your pressure switch set up someone might be able to give you some useful advice. I just can't imagine why you have had to touch the pressure switch and am busting to see some photos so I can find out! Link to comment Share on other sites More sharing options...
smule Posted 10November, 2014 Author Report Share Posted 10November, 2014 Thanks Peter, I have attached a pic of the compressor and marked the service points that I have identified, as you will see the high pressure port has the pressure switch attached to it. https://www.flickr.com/photos/119442573@N04/15133656214/ Sam Link to comment Share on other sites More sharing options...
Coastr Posted 10November, 2014 Report Share Posted 10November, 2014 Have you evacuated the R134 yet? Or is that what you're trying to do? Link to comment Share on other sites More sharing options...
smule Posted 10November, 2014 Author Report Share Posted 10November, 2014 Yes 134 has been evacuated, now trying to charge with new gas but confused by the service ports and pressure switch and whether I need to find alternative high pressure port . Link to comment Share on other sites More sharing options...
Peter M Posted 10November, 2014 Report Share Posted 10November, 2014 Sam,In that case they have installed the high pressure service port somewhere on the high pressure line by using a fitting like shown here:http://www.ebay.com.au/itm/like/161296944801?limghlpsr=true&hlpv=2&ops=true&viphx=1&hlpht=true&lpid=107&chn=psIt might be on the other end of the high pressure hose where it enters the first condenser just above your head?Also have you replaced your receiver/dryer? Suggest it would be a wise idea to do this now as well while it's depressurised.(BTW: It is common to have the pressure switch installed in a specifically provided port in the top of the receiver/dryer. I guess the original installers thought it was easier to replace a hose fitting and recrimp than to run a wire from the LHS front guard back to the compressor for the pressure cut out.)If you can't find a high pressure service port at all it looks like they may have relied on refrigerant weigh alone to recharge and only checked the low pressure line and didn't bother about checking the high pressure at all! Surely not???? Link to comment Share on other sites More sharing options...
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