Question : I HAVE a 1996 Proton Saga, 12-valve
Last February, I did an overhaul and
the engine is running fine, except that
I'm facing serious problems :
1. The auto gear box : Each time I
start the engine any time of the day,
the auto transmission does not engage
until the engine has warmed up. Also,
when it starts to move, it will revved
up to 3,000-4,000rpm before engaging to the next gear level. After that
it will engage smoothly. I don't face
any problem with D2 or L. What is the
Things that I've done - I have
changed the oil seal and top up with ATF when I did the overhaul. My mechanic advised me to drain the present
ATF, and change to a better quality.
What do you think?
2. Air-cond : It blows only hot air during traffic jams or in the afternoon. It
is only cold in the early morning and
Things that I've done - I have done
the usual service such as clean the
filter and blower as well as fill in the
gas. What parts do I need to service or
1. I do not think your problem is with
the ATF. I think you have a problem in
the valve block or sometimes called the
'brain' of the transmission.
When you shift into D, the hydraulic
fluid is routed to several shuttle valves
which route the fluid to cause the changes.
I suspect that the 1st and 2nd shuttle
valve is sticking and that may be the reason for the late shifting. However, when
you manually shift into any particular
gear it seems to run OK.
Get a competent auto transmission mechanic to have a look at the valve block.
He may have to pull it out and service it.
2. The obvious thing to look at when
the air-conditioning is not cold is to
charge up the gas or refrigerant.
However, the problem could be with
the compressor itself as it may not be able
to compress the refrigerant sufficiently
due to wear, or the thermostat may be
Get someone who has the right tools
to check out the pressures in the system
and the operation of the thermostat. You
will be able to see that it is not that big a
problem after all!