There is al small misunderstanding.
You should do this !
DEFINE ADC_BITS 10
DEFINE ADC_CLOCK 3
DEFINE ADC_SAMPLEUS 10
adcVar VAR WORD

char VAR BYTE

TRISA = %11111111
ADCON1 = %10000010
DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 24h
DEFINE HSER_BAUD 9600
DEFINE HSER_CLOERR 1
PAUSE 005

main:
If PIR1.5 = 1 THEN

HSERIN [char] 'and than this

HSEROUT [DEC adcvar, 10, 13]
ENDIF
ADCIN 0, adcVar
PAUSE 50
GOTO main