ok.... i have been driving an astina for over 6 years now.. for me this radiator issue is a bit of a mystery... however its a seriouous problem.. and i have the 1989 one,, which is the oldest out of the lot.. as far as i know the astina never came with a digital meter.. which means someone has messed around with it...
go to mazna motors pepliyana junction.. he knows what he is doing.. before u go to the agents.. i dont recomend the agents for the astina.. since it is a JDM car.. they dont have a clue... keep the agents as the last resort.. for this DOHC engine its very hard to get beyond 9 KM a liter even with very moderte driving.. mine has clocked over 300,000 now.. and its still packs a punch.. its all about how u take care of it.. but i feel someone has messed with ur car... the parts to look out for its the air flow sensor.. i have the meter type and u have the senso type which is far better i belive....
as with old cars, the grounding should be bad on urs as well.. when u get these sorted out.. first put a good grounding kit to the car as well.. a meter board should be easlily obtained. as the car is in par with the old 323's.. first go to mazna and see.. if u have any trouble drop me a call... 0777335057