1999 Toyota Camry low side suction 89psi high side liquid zero

[wirenet29]

I have this 1999 Toyota camry I pulled a vacuum and started to charged it up with r134a and the low side pressure went to 80psi on the suction side. The high side liquid line is zero I wonder is the expansion valved closed open or closed.

[Tom Greenleaf]

What are you using for gauges? For now I don't think they are actually reading pressure nor really getting gas into system at all? Some you just need to push down on at ports or find another set?

It almost can't have zero pressure on one side like you see? You may just be reading pressure of you source of 134a? That or knob set wrong, not closed high side?

Did those work to vacuum it out?

[Cornbinder89]

Tx valves don't "close" they are a restriction that changes but are always open to some degree.

[Cusser]

Some you just need to push down on at ports

We had a vehicle like that, think a 1994; one had to press down on the high side fitting to get the reading.

[Cornbinder89]

Also be sure you are connecting to the correct fitting. There is a fitting by the air cleaner on the end of an aluminum tube (often with a green cap) that is used for testing and diagnosing the evap system. It has nothing to do with the A/C but looks somewhat similar to an A/C fitting.

[Tom Greenleaf]

? If as a test you are on the fitting properly if any pressure in system unscrew hose at manifold of gauges will spit. Bet it doesn't? Knowing the path inside gauge set is mandatory and if knobs open or closed is what you are reading or just source of refrigerant.

I can't speak for the all yes all for 134a you can run the 12oz cans thru gauges! If a 30lb bottle it may need a Shrader adaptor. IDK - some or all you can put hoses on backwards nothing works!

[Cusser]

I can't speak for them all, yes all for 134a you can run the 12oz cans thru gauges!

Yes. I do that through the low side when filling, I use 12 oz cans of pure R134a.

[wirenet29]

Tom I could pull a 29 inches of mercury on the suction line. I wonder after changing the schrader valve if the high side liquid schrader is not making contact with the ac manifold by mastercool.

[Cornbinder89]

that doesn't tell you anything. The way the quick connect hoses work, they seal when not connected, the gauge is connected to the hose side on the manifold, and the the valve/knobs are between the hose and center vacuum/charge yellow line. Open the valve with nothing attached at the quick connect end, and the gauge will show vacuum (with it connected to a vacuum pump). The gauge only shows what is happening to the hose, not what is happening elsewhere. So if the quick connect is not making a connection to the system, all you are seeing is what is happening in the hose.
To see 90 on the low side and 0 on the high side, esp with the compressor not turning, it means the high side (at least) is not connected to the gauges, and if that is true, the low side may not be also, you may have just pulled a vacuum in the low side manifold line and then pressurized it to 90 with R134a.
Since the system is a loop, it is impossible to have pressure in part of the system and not in another.

[Cusser]

I wonder after changing the schrader valve if the high side liquid schrader is not making contact with the ac manifold by mastercool.

See post #4 from 3 days ago

[wirenet29]

Tom I found on my Mastercool gauges that my high shutoff gasket were defective and I am ordering new parts. Think you for your help. I will keep you updated on my progress.

[Tom Greenleaf]

Go for it. Dinky details matter. Hard to find U can.
BTW, will still use gauges (Snap-On) = Robiniair cost a week's pay in the 70's.
Yikes!