Trying to find ac service ports on 03 lincoln ls

Todd, Low side A/C port, Check the attached links,instruction and guides, Good luck
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2000 Lincoln LS AC Low pressure port Location
2005 Lincoln ls low pressure port
low side port 2003 lincoln ls v6 Google Search

find the ac compressor,two lines come off the compressor,the large line/hose has the low side service port on it ,just follow the large ac line/hose untill u see it ur charge hose will couple on to it

no,,, but find compressor and look for ac lines coming from it follow the large ac line untill u come to the small service port this is the low side the large port on the small line is the high side ,dont use it u can only hook to low side with single charge hose

on the ac compressor behind left front tire...u will c a litttle flap behind it is service port

your thermostat is stuck

Check to see if your radiator is holding pressure. Fell your radiator, let it idol and make sure nothing is leaking. If you have a small leak, try running through a bottle of MAC's(or any brand) leak stopper. It should work. But make sure you follow all the instructions, when it says let it idol for 30 minutes, let it idol for 30 minutes. I have seen/found Lincoln LS's seem to have quite a few leaks that pop up on it's radiator, the plastic thermostat housing and it's cap. Have fun.

sometime its up by the firewall on the passenager side they hide these things try these websites car A/C repair www.directgardening.com and fix &toubleshoot heating & A/C www.automedia.com take care Michigan Man.

the charging port is down low near the ac compressor on the engine

The lincoln better idea engineers put the low side freon port in a peculiar place.. You will find the low pressure port near the compressor under the car on the driver's side. You will need to put your car on a lift to get to it. Once you raise your vehicle, take the plastic shields off and you will find the compressor...yup...it's a tight spot.
Hope i was able to answer your question...be safe.

at the compressor beneath the car no access at the top