Cannot find the lower ac port. 202 x-type jaguar

You don't. You replace the AC condenser with a Bypass Pulley. It uses the same belt and routing and fits in its place.

https://www.google.com/search?q=03+jaguar+x+type+3.0+ac+bypass+pulley

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Hi Karen,here's a link on where your low pressure port is. Where is the ac low pressure service port on 97 Jaguar Xk8

What issue?
Lower in front of what,than what ?
What is the question,what changed
since you owned it?

on compressor underneath

It's under the car by the left front wheel. turn the steering wheel all the way to the right to give you some access. now lay on the ground and between the rear of the tire and the fender you can see the port. not the easy but you can do it

sounds low on R134a. Add a can to the low rpessure port scharder valve ffitting.

3.0L ? Low side is on the ac compressor (bottom driver side). High side is on the accumulator facing up almost touching the hood, up against the radiator, passenger side.

While facing the from of the car, look to your left side (passenger side) all the way to the back there should be two lines; its gonna not the last lower one but the second higher one. The refrigerant's nozzle should fit. Just be Sure that the car is on and the ac is to the max on its lowest setting. This should allow the nozzle tip to click right in.

Cj ;)
Your welcome

The lower port is located on the larger of the two lines going in/out of your A/C compressor (the lines are silver tubes and your compressor will have a belt of some sort attached to it).  You can also tell which is the lower port because that line will be cool/cold while the high side port line is smaller and will be warm/hot while the A/C is running on max.

the heater control valve is often the cause of this. there are 3 metal lines running down the right fender, if 2 are hot and 1 is not with AC on max the valve has most likely gone bad,