The ac clutch is on for 2 sec and then off for maybe 20 sec.
With a gauge the low side drops from about 100 to 50 then turns off.
I tried to add freon and it only took a quarter of a can and did not change the problem.
On some ac systems there is a cut out switch if the refrigerant drops to low. Could this one have a faulty on? Could the expansion valve be blocked. Does it have a expansion. I bought a haynes previa repair manual but it says nothing about the ac.
I just bought the van with the problem.
I intend to repair it myself if I can. I have repaired the ac on other vehicles I've owned. If could get wireing diagram and location of parts.
If I have to I can take it to toyota just to diagnose it. Then replace the problem componets, flush the system, add oil and vacuum it.
Thanks in Advance
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You've got some of the picture, but not all of it. You need to know what the high and low side readings are, so yes you do need the gauge set. If the system is charged, and the low side is not dropping below 25psi, I would guess the low side pressure switch is faulty. But if the low side is dropping below 20psi when the compressor stops, the system may be low on freon. Which means you have a leak somewhere. The hissing noise is freon flowing thru the system which could also indicate a low charge.
You need to have the refrigerant charge level checked, it sounds like it is low. You Need a set of AC pressure gauges to do this testing. If the system has a low charge the pressures will be very low in the low side testing port.
CHECK REFRIGERANT CHARGE. USING A MANIFOLD GAUGE SET. HOOK MANIFOLD GAUGE SET TO LOW PRESSURE PORT AND HIGH PRESSURE SIDE PORT. LOW SIDE PRESSURE SIDE SHOULD HAVE 25 - 36 PSI AND HIGH PRESSURE SIDE SHOULD BE 178 - 237 PSI. IF LOW SIDE PRESSURE SIDE READ BELOW 20 PSI THE LOW PRESSURE SWITCH WILL NOT TURN ON THE AC COMPRESSOR CLUTCH NEED TO ADD LITTLE MORE REFRIGERANT. IF REFRIGERANT LEVEL CORRECT CHECK AC COMPRESSOR FUSE AND RELAY.IF POWER GOING TO AC COMPRESSOR CLUTCH YOUR COMPRESSOR CLUTCH HAS OPEN WINDING. AC COMPRESSOR CLUTCH NEED REPLACING.
is it manul or automatic either way you have to do the following remove prop shaft then unbolt the gearbox from engine then unbolt the gearbox mount and lower via a jack and pull back and the clutch is there in front of you six more bolts and its in your hand refitting is the reverse of removel
you will be able to doit on the ground and use good axel stands and jacks
probably low on freon R134A. Buy a can with a gauge on it. Addd to the low pressure port in engine compartment on passenger side, low pressure hose. If the compressor starts working, then you are low. Do not overfill or you will damage compressor. The gauge should have a "good" zone on it, stay in the god zone. If it starts cycling very fast, it is still low.
It should cycle 4 to 7 times/minute at 70 degrees F.
report back on progress.
Please rate as fixed if this helps.