93 Tercel A/C

[millennm]

Well my mother's Tercel A/C isn't working. The clutch isn't engaging when the A/C button on the dash is pressed. Therefore, I guess there is a freon leak and a low pressure switch on the compressor is keeping it from engaging. So I'm going to add freon to the system to see if the clutch will start working. I heard that there was a freon change over from R12 to R134 between '93 and '94. Well, if anyone knows which refridgerant the '93 Tercel takes please respond. Also how do you know when you've entered enough refridgerant. Do you have to hook up a guage to the high or low side? What would the full pressure be?
Thanks
Keith

[dexter_5000]

best to bring it to a dealer and shell out the cash in most cases with ac you have to be certified and have a machine to put it in.

[matrix37495]

It would be a good idea to convert it to 134a, it'll cool better and you can add refridgerant youself in the future. Have a certified tech evacuate the system and you can go to any auto store(like advance auto parts or autozone) and get a r12/r134a conversion and save$$. It will come with a gauge so you don't have to worry about over filling and screwin somethin up

[Mystral Hawk]

Well my A/C just entirely died...so do any of you gurus have any solution to this predicament? Its kinda pricy to install a new one...

[thoughthard]

millennm,

On my 92 Paseo, the wiring that went from the dash button to the compressor fried itself in two near the radiator area. Has done it twice now. You might want to troubleshoot first before adding freon.

[jeffs94]

Originally Posted by millennm

Well my mother's Tercel A/C isn't working. The clutch isn't engaging when the A/C button on the dash is pressed. Therefore, I guess there is a freon leak and a low pressure switch on the compressor is keeping it from engaging. So I'm going to add freon to the system to see if the clutch will start working. I heard that there was a freon change over from R12 to R134 between '93 and '94. Well, if anyone knows which refridgerant the '93 Tercel takes please respond. Also how do you know when you've entered enough refridgerant. Do you have to hook up a guage to the high or low side? What would the full pressure be?
Thanks
Keith

I dunno when toyota changed from R-12 to R-134a but i do know that the oil will have to be changed out along with the O-rings seals(the oil and for the different refrigerants is not compatiable and in most cases neither is the O-rings). If it already had R-134a then have it evacuated or better still, have a certified pro do it....they will know what to do, how much to put in and will be able to find the cause of why it no longer works (the leak). A system with the wrong type of oil mixed with the wrong type of refrigerant can be an expensive fix. R-134a systems use quick disconnects and R-12 systems use threaded connectors on both the high and low side.

[paseonate]

so.. my 93 paseo is pumping lueke warm air into my car in already 100+ weather.. the ports off the low pressure and high pressure lines are not threaded so i figured it was 134A but after filling it to proper psi it still is pumping that god forsaken warm breeze.... so i kept checking the pressure in the lines every 5-10 minutes about 5 checks so far and no decrease in pressure that i can notice... so has anyone learned any troubleshooting techniques yet?