Location of 99 avalon low side port - 1999 Toyota Avalon

USA are you or Europe???? hint cars not the same.world wide.
Mercedes-Benz ( the makers here have no service manuals sold to owners) <<< makes repairs hard and expensive.
R12 OR IS CAR UPGRADED TO R134A OR R1234?

well it has 2 caps on the port. so 2 there are
there are 2 lines there, one is huge one is small
one side is called low side, and the the other is high side.
best is not touch the 300PSI (21 BAR.) SMALL LINE TUBE.
do not attach a walmart R12 can here or it will explode. in the face, OK end safety rant1, and where goggles.
the low side is about 10X LESS ABOUT 30 PSI
THE R12 RETURNS HOT AND IN GAS FORM. USING LARGE TUBE.
THE COMPRESSOR COMPRESSES THE GAS BACK TO A LIQUID STATED, AND SEND THIS LIQUID TO THE CAB EXPANSION VALVE TO GET COLD.

ONLY MESS WITH THE LARGE LINE , PORT
R12, IS FACTORY PORT,

THIS IS ORIGINAL 1999, WHAT IS THERE NOW I'VE NEVER A CLUE BLINDED IN A TEXT BOX. HERE.. MESS ONLY WITH LOW SIDE. OR BOOM,
THE HIGH SIDE CAN EVEN HIT AND EYE AND BLIND YOU.
EASY. GOOGLE ARE NECESSARY.

IN REAL SHOP THESE 2 ARE CONNECTED TO A TOOL CALLED A MANIFOLD. AND IS USED IN A SAFE MANOR.
A SKILL TECH TRIES NOT TO INTRODUCE AIR TO THE LOOP
AND DOES SO PURGING LINES IN THE MANIFOLD FIRST.
AIR IS BAD, BAD NEWS. (AND AIR IS EVERY WHERE)<LOL

Yes, you may have just 3 coils you should change all the spark plugs. Use these pictures to select what yours looks like.




I hope this helps. Take Care.

Under the hood on the far back wall passenger side you'll see what looks like an air hose connection. It may have a protective cap. You can access the low port there. The system uses Refrigerant 134a.

Hello, the low side is normally the one closest to the big silver tank looking thing, also if you bought a refill kit at a parts store, the hose that comes with the kit will only fit on the low side port, and it will Not even fit on the wrong high side port, the low side will have a smaller fitting and high side has a bigger fitting that will make it impossible to screw it on to that high side, so don't try to jam it on , if it doesn't fit nice your at the wrong port. one more thing when you buy a refill kit, it will have some directions as to witch is the low side port, Good luck with cold air system.

I show the first year for cabin filters used in Toyota Avalon cars being 2000 not 1999.
The 2000 model filter is behind the glove box.

Closer to firewall is where your low side port should be. Your R134 filling hose quick connect adapter will ONLY fit on the proper "low side" connector port at that location because it is a different size than the high pressure port. You can't put it on the wrong port and get it to fit.

The blower motor switch or the resistors are defective.

If its clear then its washer bottle
If its either green or yellow then its coolant and the tank will have LOW AND HIGH

For the a/c it is located on the accumulator toward the right side firewall near the battery. I hope this helps you.Good luck

the low pressure port is located at the back of the engine next to the firewall and down towards the exhaust manifold