hilux 2003 fault
Submitted: Sunday, Oct 27, 2013 at 19:59
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104888
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PhilG42
G'day, my 2003 hilux aircon works fine around town but once we hit the highway it has a tendency to blow warm air at high speed, if we pull up and wait for a couple of minutes it starts to work again, have checked over mechanical parts and can hear vents open and close when we work the
the levers and the clutch drops in and out when we switch it off and on, is it electrical or mechanical??? , any ideas???
Reply By: Ross M - Sunday, Oct 27, 2013 at 20:43
Sunday, Oct 27, 2013 at 20:43
PhilG42
It may be the aircon has a full load of gas, has it ever been recharged? and the pressure in the system is getting too high when underbonnet temps get up high. The high pressure switch which is beside the low pressure switch in one of the aluminium pipes, may be going open when at the higher speed/underbonnet temp.
Maybe the radiator cooling fan clutch isn't as good as it should be and airflow isn't great under there.
It can be checked if that is happening by adding a thin wire to the aircon clutch wire and fitting a small
test light to negative on the end of it. Light will be on when aircon clutch is driving the compressor. If it goes of for extended periods and you are getting warm, then it is an indication of over pressure because of the temp.
If it has been regassed, the service person may have put a tad too much gas in there and it manifests itself when the heat rises.
I'm not aware of anything which would intermittently cut the compressor out.
If it was a aircon clutch drive problem , it would have fried itself by now.
That is my theory. Some checking with the light may reveal the fault.
The high pressure switch is the one which has a definite connection across its terminals when the loom plug is removed, when engine is off. This goes open when too much pressure happens.
The low pressure switch will have no connection across it's pins when plug is off for a
test.
Are all the grass seeds out of the rad and aircon condenser?
Cheers
Ross M
AnswerID:
520476
Follow Up By: Member - LeighW - Sunday, Oct 27, 2013 at 21:03
Sunday, Oct 27, 2013 at 21:03
A lot of strange faults with Toyota air conditioning have been attributed to the air conditioning relay in the main fuse box in the engine bay. If possible swap with a similar relay in the fuse box if there is one to eliminate it.
Leigh
FollowupID:
800925
Reply By: Member - fawkesp - Sunday, Oct 27, 2013 at 21:28
Sunday, Oct 27, 2013 at 21:28
PhilG,
I had a Falcon once that had a similar problem - it turned out to be the a/c radiator unit in the dash (not sure what it is called) where the air passes through and is cooled by the refrigerant. It would freeze up and block the air so it could not pass through.
Turn it off for a few minutes, the ice would thaw, and we would have cold air again.
It turns out the thermostat was set too low, a simple adjustment by the a/c guru and all was
well.
Peter.
AnswerID:
520481