Bro if your Liana is 2006 model then most probably it needs the new ECU firmware to be installed. Get it refreshed and the issue should be resolved.
Get the plugs gapped properly and change if possible. Get the dual tip or quad tip ones.
Get the throttle body cleaned up as well.
This should resolve the issue.
Yes this is possible and there are many ways of doing it.
Unfortunately, sall dealerships want to charge for gas refilling where they make a clean profit. I called up Suzuki Raiwaind Motors before going there and they said we would be able to clean the evaporator without dismantling it b ut as soon as I went there, they service manager saw me all dressed up in office clothes and mu office ID hanging by the belt. He said they won't be able to do it because the "throw" of the air won't be right after service.
I told him I was fine with it but then afyer arguing for a few minutes, he said "gas to hum re-charge karen *** he!" I understood what their policy was and left. They lost a potential client!
Anyways, see the links below:
Amazon.com: FJC 5914 Foaming Evaporator Cleaner: Automotive
Amazon.com: Kool-It 96030 Evaporator and Heater Foam Cleaner: Automotive
Amazon.com: einszett 961105 Klima Cleaner: Automotive
And here's a DIY I found on the internet. I am planning something similar with my Liana. I am not in favor of those buggers opening up everything behind the dashboard and then re-charging the gas. Those leaks never stop afterwards...
My attempt to clean the evaporator coil today (pics) - E46Fanatics
Hope this helps!