Engine shuts down when i put d ac on - 1995 Toyota Previa

you have no R134a Freon (puron) refridgant now.
no problem told at all, car out of warranty????????
sure AC is dead right can we know this first?
first off learn how AC works or gue$$sing will be super expen$ive.
the PCM and BCM brains run AC
and has lots of rules to do so.
and those brains cut the AC dead for many reasons even 10 .
OK this is rule #1 to learn
fuses good (the endless story here)
1: fuses good;.as in ALL.
2: scan the PCM for AC errors. really jack in to the obd2 port under dash and scan it or go broke fast guessing
3: if the input to the AC relay is dead wrong why blame it? IDK?
4: the blower in dash must blow on high does it? it must !!!!
5: the AC lamp on dash controls must glow when turned on and it must; or we fix that first.
6: the knows set to recirc mode, hot/cold spun to full cold., and vents set to what you want I try them all fore sure front vents.
7: the AC clutch energizes. if not see below. causes.(not from above)
8: R134a high/low switch (pressure transducer) is tripped to low and AC is shut down on purpose or is too high, overfilled R134a causes that. for sure
9: the bend door struck closed, may case the evap to ICE UP
and trip off the clutch.
10 does the evap core tubes fell cold?
11the blend door most block heater core to get COLD air.but will not sure if clutch is not engaged sure.

you pulled vacuum on the new system for 30min + ?
and put in the correct by weight of R134a?

the AC shuts down if engine pcm detects overheated even ECT lies
or ECT is stuck in an air pocket air on cooling loop.
see why we scan all cars, for sure
AC shuts down if engine is overload, even if map or MAF sensors lie to it. (again we scan ALL THAT)
AC SHUTS DOWN IF PCM SEES FRONT FANS FAILING
AGAIN SCAN IT.
THE CAR RUNS VARIABLE GRADE COMPRESSOR, THAT MUST BE THE CORRECT PART.
F36 AND F32 MUST NOT BE BLOWN
THE WORDS NON SERVICABLE, MEANS THE WHOLE BJB MUST BE REPLACED FOR 1 RELAY BAD. SUX SURE.
BUT THE 2 FUSES MUST BEG GOOD 12VDC BOTH SIDES KEYON
THE PIN 32 AT 12VDC, RUNNING AC ON.
PIN 5 IS 0V AC ON BUT IS AT 13 TO 15V ENGINE IDLING AND ACT ON THIS MEANS, PCM DOES NOT WANT TO TURN IT ON
ON PURPOSE AND MY LIST ABOVE SHOWS MOST OF THEM


LEARN THAT NEWER CARS ARE WORST
TO SAVE FUEL AND CO2, OUTPUT THE THERE ARE
LOTS OF AMBIENT SENSOR TOO THAT MUST BE IN RANGE.
SCANNING THE OBD2 PORT IS THE ONLY WAY TO FIND THIS OUT.
PIN 36 IS THE VARIABLE. ACCV SOLENOID, NOT SURE ME
IF BAD WHAT THE COMPRESSOR DOES I GUESS GOES TO LOW OUTPUT NOT DEAD.

Why are you messing with the AC? It's telling you the engine is overheating and that's why it shut the AC down.

It could be more than one problem.
The cooling fan could be running because the temp sensor is sending the wrong signal to the computer.
The ac compressor or clutch could be bad causing a heavy load on the belt and the engine.
I would unplug the compressor clutch and see if the engine still bogs down with the ac engaged.

Temp should be around 200 to 215. The fans will come on at 225 without the ac on. After that engine should cool down to below 225 and the fans will shut off. I suggest that you put a new thermostat in it and make sure the engine is full of coolant with no air trapped in it.

Induction Service: hose is loose. Just had this fixed thru a dealership.

Cooling fans only run when the temp,of the coolant get to about 215 to 218 degrees,and shut them selves off,when the engine cools down,if they do not cut off,the engine is not cooling down,now,if the ac is on,the cooling fans will stay on until the ac is shut off.

Sounds as if the A/C Compressor has issues with the clutch/shaft locking up.... the blow off you heard was probably the pressure relief valve allowing an over charge of freon escape the system....however if the A/C system has a compressor problem or a clog that condition will also happen....can you have someone put a set of high/low gauges on it just for safety sake to be sure it is not developing too high of a head pressure...that would be my recoomendation....if the compressor locks up the belt can be thrown off causing your vehicle to require a tow/repair on the spot.

sounds as if the torque converter clutch is locked up or has an electrical short inside the transmission pan, or a chafed wire.

Sounds like the clutch in the ac compressor is bad. Locking up and putting strain on the motor enough to bog it down and kill it.

take it to a shop and have your ac charged there may not be enough freon in the system to keep your compressor kicked in at higher rpms