[JoshCampbell]

A/C blowing warm air. A/C button or Compressor only works intermittently. Meaning sometimes it clicks on and sometimes it doesn't. When does come on I get warm and hissing/gurgling coming from the evap core area. I topped off the freon (guage said fully charged) and swapped out evap core. Problem persists.

I've only put a small percentage of attention on this up until (ha too many other issues to fix first), so I've just scratched the generic Google answers thus far. Just curious if anyone has in into this issue?

 

[Cusser]

A/C blowing warm air. A/C button or Compressor only works intermittently. Meaning sometimes it clicks on and sometimes it doesn't.

This could be due to several issues: low refrigerant. AC clutch gap, insufficient air flow causing AC clutch to get too hot, bad AC switch, bad de-icer/thermostat switch, even bad resistor unit

I topped off the freon

No you didn't, freon is R-12 and you have R134a in yours.

guage said fully charged

These cannot be determined to have full charges by pressures, even with real low AND high pressure gauges. Sophisticated equipment to pull out the refrigerant and then add the correct amount by weight is the only real way to know it's fully filled.

I .... swapped out evap core. Problem persists.

This would only help if the original evaporator core had a leak. You likely wasted your time and money on this, hope the new connections don't leak !

guage said fully charged

A "store kit" with just a low side gauge is pretty worthless. And can actually do real/expensive damage if theat can contained any sealers !!! They can ruin a system !!!

 

[kevinjohnson3216]

Did you change the expansion valve with the core?

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[JoshCampbell]

Sorry for the delayed response, the Pistons stopped firing on me 10 minutes from the house yesterday, so I had to deal with that.
@Cusser While the new evap core is exhibiting the same issue as the old one I don't consider it a wasted purchase. The original core was in seriously rough shape. I will look into your comments regarding the low/high side accuracy. I did read that too little refrigerant prevents optimum pressure from being reached and keeps everything in a liquid state. As for the "new connections" not leaking, the new core didn't come with any. Had to salvage the old piping as the original part is discontinued.
@Kevin I did not replace the expansion valve. After researching this I learned that it's responsible for converting the liquid to a gas, and failure can produce hissing/gurgling as well. I will purchase one this weekend just to rule it out.

 

[Roader]

A vacuum was pulled and held after replacing the evaporator and before filling with refrigerant?

 

[kevinjohnson3216]

Sorry for the delayed response, the Pistons stopped firing on me 10 minutes from the house yesterday, so I had to deal with that.

@Cusser While the new evap core is exhibiting the same issue as the old one I don't consider it a wasted purchase. The original core was in seriously rough shape. I will look into your comments regarding the low/high side accuracy. I did read that too little refrigerant prevents optimum pressure from being reached and keeps everything in a liquid state. As for the "new connections" not leaking, the new core didn't come with any. Had to salvage the old piping as the original part is discontinued.

@Kevin I did not replace the expansion valve. After researching this I learned that it's responsible for converting the liquid to a gas, and failure can produce hissing/gurgling as well. I will purchase one this weekend just to rule it out.

O rings definitely need to be replaced any time a AC hose is taken off

Expansion valve should be replaced any time the system has been open to air for a long time or if the compressor seized up or if a leak sealer has been used

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[JoshCampbell]

Given that my compressor only cycles on when it feels like it, my expansion valve is old and likely faulty, I salvage and reflared existing piping due to discontinued parts, and lacked the proper gauges to properly pressurize the system, it's likely that I'll be redoing most of HVAC system ☹

 

[kevinjohnson3216]

Given that my compressor only cycles on when it feels like it, my expansion valve is old and likely faulty, I salvage and reflared existing piping due to discontinued parts, and lacked the proper gauges to properly pressurize the system, it's likely that I'll be redoing most of HVAC system ☹

Should be fittings sealed with o rings not flare compression , did you replace the o rings?

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[JoshCampbell]

I repaired/flared the small line going through the firewall into the evap core. It links into the expansion valve. I put a makeshift rubber Oring on that piece. In any case it's not leaking from there far as I can tell. I'll get some dye this weekend to confirm. The culprit appears to be within the core area. I'm leaning towards expansion valve, but it could turn out to be something completely unexpected. Afraid I can't offer much more until I dive back into it this weekend.