Reply to "Can I put new 134a into an OLD AC system"

joules"Racing is Life, anything before or after is just waiting" - Steve McQueen

The only way to do this is a full system flush and partial component upgrade for R134a. There will be enough oil residual mineral in the system and the two are incompatible. You will need an R134a expansion valve as the orifice size is different for the operating pressure or you will blow high side hoses. Reverse flush the system completely, replace the expansion valve and the dryer, add a high pressure switch, use ester oil and you should be good.

4/29/192:18 PM

<ul id="{%=id%}ButtonGroup" class="button-group h-popup-buttons even-button-group even-1">
    <li id="{%=id%}Okay_buttonContainer"><a id="{%=id%}Okay" href="javascript:void(0);" class="button success no-margin-bottom h-alert-modal-ok-button" role="button">OK</a><script type="text/javascript">
        (function() {
            function {%=id%}Okay_click(event, data) {
            {%=id%}Popup.hide();
        }
        
                $('#{%=id%}Okay').on('click', {%=id%}Okay_click);
        })();
    </script></li></ul><a href="javascript:void(0);" class="close-reveal-modal" aria-label="Close Modal">&#215;</a><div class="last-modal-focus focus-utility-element" tabindex="0"></div>
</div>
<script type="text/javascript">
        (function() {
            {%=id%}Popup = new SS.Popup.ModalPopup('{%=id%}');
        })();
    </script>

Skip to main content

Membership Required

Remove From Your Block List

Manage Follow Preferences

Block

Please wait...