If you dont want to do too much kharcha than.
1 - Get the a/c serviced complete
2 - Get 2nd hand compressor cost will be around 3500 Rs of same indus corolla.
Now installling new compressor you need.
New compressor, Only Sanden japanese for around 12000
New pipe fitting more kharcha
New bracked a nother 1000
The advantage is with this setup you should not face trounble for few years.