My 2003 xtype battery went dead and I had to replace it and now my ac doesn't work, blows only hot air and it was working fine before.

ip CLUSTER LAMPS,
BRAKES LAMP MUST NOT BE IGNORED, SCAN IT.
but see this....
BATTERY LAMP REALLY MEANS ALTERNATOR JUST DIED.
when that dies, battery discharges fast even 1hour long the battery does dead and will not make spark or crank it now bat dead.

forget the AC, AC shuts off to save you form stalling in traffic,
it delays the stall in truth , see that lamp go to autoshop or home fast.(batt lamP)
it is a blessing and the AC shuts off too, for engine overheat.
and if engine stalls (a no brain'er that, sorry)

The alternator is bad or its huge huge fuse blew in the huge engine bay box , 50 to 100amps comon size.
battery voltage is 13.3v to 15vdc, below that the alternator is dead.
check all fuse is wise now
I bet brakes are not bad ABS etc. or traction controls etc.
as battery goes dead one module after another goes dead(offline)
and most times spark is last, just making it home in time to fix it.
my all time record , drove for 1 full hour ALT ***** on the fly
and made it 1 bock from home, and coast the rest;.
other times less, done at least 5times in 50 years OTR.

probably burnt the compressor out. for ac work it pays to go to a pro that does ac for a profession especially with Mercedes. one thing done wrong could backfire to mega bucks..

Does the Compressor kick in when you turn on the AC? If it doesn't, the AC compressor is governed by the ECU. My AC went out along with an acceleration problem. hard starting, and unburnt fuel. I had my ECU rebuilt, and upon installation of the rebuilt unit, all worked perfectly again, including the AC.

think you have damaged the heating control computer from the sound of it

too much gas

charge the a/c add a/c dye and ck. for leaks

MY 2003 MALIBU AC WORK VERY COOL FOR ABOUT ONE HOUR AND THEN TURN A BIT HOT AND THEN NO AIR COME OUT WHY I HAVE CHECK THE FREON AND ITS OK .

You have a vent control actuator motor stuck,or gone out.

if it is not blowing at all then it has nothing to do with the a/c.It's to do with the blower fan, either a fuse or a replacement is needed here.

is it low on free-on?