A/c issue I just bought a 1998 Jetta TDI. The previous oner said a/c needed charging. I checked the system with a guage and it reads high pressure( on low pressure side). Fans work well, when you push a/c button sounds like compressor is working, but no cold/cool air. What now?

You will have to have the fault codes read by a code reading machine . That will tell you why the engine stopped. I am suggesting that you check to see if the cam shaft is turning when you try to start it as the timing belt may be broken. Repair/replace items listed by the codes -reset the CPU with the code reader

The battery warning light means the alternator is not charging the battery. And the check engine light is probably for the same issue.
Have you had the charging system checked ?

1993-2005 Volkswagen Jetta, Golf, GTI, Cabrio (A3-A4) Hatchback & Sedan Workshop Repair Service Manual - 350MB PDF

1993 2005 Volkswagen Jetta Golf GTI Cabrio A3 A4 Hatchback Sedan...

This is a COMPLETE Service and Repair Manual for your 1993 1994 1955 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 VW Jetta, Golf, GTI, Cabrio (1.8L turbo, 1.9L TDI and PD diesel 2.0L gasoline, 2.8 LVR6) (A3, A4 Platform) Hatchback & Sedan. It covers every single detail. All models, and all engines are included.

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1993 1994 1955 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 VW Jetta, Golf, GTI, Cabrio (1.8L turbo, 1.9L TDI and PD diesel 2.0L gasoline, 2.8 LVR6) (A3, A4 Platform) Hatchback & Sedan
===========
Format: PDF
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Requirements: PDF Reader.
Printable: Yes

TABLE OF CONTENT (example)

GENERAL INFORMATION *

ENGINE *
engine mechanical
engine lubrication system
engine cooling system
engine control system
fuel system
exhaust system

TRANSMISSION/TRANSAXLE *
clutch
manual transaxle
automatic transaxle

DRIVELINE/AXLE *
front axle
rear axle

SUSPENSION *
front suspension
rear suspension
road wheels & tyres

BRAKES *
brake system
parking brake system
brake control system

STEERING *
power steering system
steering system

RESTRAINTS *
seat belts
supplemental restraint system (srs)

BODY *
body, lock & security system
glasses, window system & mirrors
roof
exterior & Interior
Instrumental panel
seat

AIR CONDITIONER *
air conditioner system

ELECTRICAL *
wiring diagrams
starting & charging system
lighting system
driver information system
wiper, washer & horn
body control system
lan system
audio visual, navigation & telephone system
auto cruise control system
power supply, ground & circuit elements

MAINTENANCE *
maintenance

INDEX *
alphabetical Index

1993 1994 1955 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 VW Jetta, Golf, GTI, Cabrio (1.8L turbo, 1.9L TDI and PD diesel 2.0L gasoline, 2.8 LVR6) (A3, A4 Platform) Hatchback & Sedan

not usually you would hear a vacuum leak

You didnt actually post a question so I will try to help. You need 134a refrigerant and a way to get it into the system. Places like walmart and Advance Auto Parts has what you need. Most diy kits have a hose to connect to the Low Pressure side of the ac system and a guage. The other end of the guage has a connector that fits on the can of 134a. Start the car, turn the ac on high, open the hood. Being careful of moving parts under the hood, connect the hose to the Low Pressure side of the ac and see where the guage is reading. Most are color coded. If it says it needs charged, squeeze the trigger until the can is empty and take another reading. Continue until the guage is in normal range.

Drain the system and re-gas.

Could be low turbo boost pressure,get the charge air system checked

Replace it First as Overheating Can Damage it and cause Fauls reading or NO reading

hi ben
my answer would be yes i would wory about it...
Guages are put on vehicals for a reason not just for looks i would have the car hooked to a diagnostic center and checked even though the guage may be faulty but i wouldnt take a chance

My mechanic in our town did a quick computer check. Car computer indicated a low level of antifreeze, he topped it up, cleared all messages off the car computer and said to watch the the heat guage for any further irregularities. I'll keep an eye on it, love the car, great mileage fun to drive.