bro i want to ask, im using w124 old merc, i already change compressor and services the aircond.cost me 2XXX..it works great..the aircond perfectly cold..but when hot day..especially at 1pm-3pm the aircond seems not to work so good ....why ha ? is it because my old car using old gas ? or do i need to add fan infront of the radiator? (already got 1 fan)