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Air Con Disease

DaGr81

By DaGr81,
in General Maintenance

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DaGr81 Mentor

DaGr81

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ok when im idling and i turn on my air con, the car revs up to 1500rpm, then drops to 700rpm like it does that quick goes up and down up and down until i turn it off or wait until it settles down, which it does after a while, also its only blowing hot air now (could need a re-gas, but that was done only just a year ago how come its gone so quick), and sometimes when i press mode to skip through where i want air blowing it makes a clicking sound loud and for atleast 30 seconds, heater works good though, although last time i used my a/c was back in april lol and thats when every time i used the a/c the gears were hard to get into, especially 1 and reverse LOL

someone help ^_^ stupid climate control

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Jdfnq Proficient

Jdfnq

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ok when im idling and i turn on my air con, the car revs up to 1500rpm, then drops to 700rpm like it does that quick goes up and down up and down until i turn it off or wait until it settles down, which it does after a while, also its only blowing hot air now (could need a re-gas, but that was done only just a year ago how come its gone so quick), and sometimes when i press mode to skip through where i want air blowing it makes a clicking sound loud and for atleast 30 seconds, heater works good though, although last time i used my a/c was back in april lol and thats when every time i used the a/c the gears were hard to get into, especially 1 and reverse LOL

someone help ^_^ stupid climate control

There is a diagnostic check that you can run to tell what the problem is.....

Start car and hold down the OFF button for 5 seconds and it will go into diagnostics mode.....

It will then show you any error codes.

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blind_elk Grand Master

blind_elk

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Probably just coincidence that the gear selection is awkward when A/C on.

The ECU will raise the idle revs when it gets the signal that the A/C is operating. The hunting for idle is probably the AAC valve.

Try holding the "cold" button until the unit displays "FC" (full cold) - does it still blow hot?

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Traditimeour Mentor

Traditimeour

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There is a diagnostic check that you can run to tell what the problem is.....

Start car and hold down the OFF button for 5 seconds and it will go into diagnostics mode.....

It will then show you any error codes.

What's it mean if all the lights light up. all good or all bad.

BTW where do you find all these diagnostic tests?

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DaGr81 Mentor

DaGr81

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Probably just coincidence that the gear selection is awkward when A/C on.

The ECU will raise the idle revs when it gets the signal that the A/C is operating. The hunting for idle is probably the AAC valve.

Try holding the "cold" buton until the unit displays "FC" (full cold) - does it still blow hot?

so i started the car and held the off button but nothing happened LOL wtf!! cold button? the blue one? its down to 18c but still hot as, sux coz its getting real hot nowadays + i cant believe it needs a regas so quick!!

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adam-__- Grand Master

adam-__-

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so i started the car and held the off button but nothing happened LOL wtf!! cold button? the blue one? its down to 18c but still hot as, sux coz its getting real hot nowadays + i cant believe it needs a regas so quick!!

It could be a leak in your system or you've got a stuffed motor (motor which controls the hot/cold). First thing is try the diagnosis to see what's going on before ripping out your dash.

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DaGr81 Mentor

DaGr81

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it doesnt want to go into diagnostic mode? :S the clicking isnt normal, as it never happened until recently :) damn ripping out the dash.....oh well perfect time to install some gauges etc etc, i'll try a regas 1st then see what happens, if theres a leak in the system how do i go about fixing that, can it be a diy? or needs to be done professionally

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exXU1 Mentor

exXU1

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it doesnt want to go into diagnostic mode? :S the clicking isnt normal, as it never happened until recently :D damn ripping out the dash.....oh well perfect time to install some gauges etc etc, i'll try a regas 1st then see what happens, if theres a leak in the system how do i go about fixing that, can it be a diy? or needs to be done professionally

If the car is more than 5 years old the rubber hoses were made to handle R12 refrigerant - the cocktail of gas used now is molecularly smaller and will weep through the pores in the hose - common thing - if you re-gas it will slowly deplete again, only way out is to try and get some R12 - but i doubt if you will. The hoses have to be replaced.The reason it is hunting is because oh the LP switch sensing a drop in pressure and the compressor clutch is comming in and out. sorry

:)

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adam-__- Grand Master

adam-__-

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it doesnt want to go into diagnostic mode? :S the clicking isnt normal, as it never happened until recently ;) damn ripping out the dash.....oh well perfect time to install some gauges etc etc, i'll try a regas 1st then see what happens, if theres a leak in the system how do i go about fixing that, can it be a diy? or needs to be done professionally

The clicking noise is worn out gears. The gears which move your vent direction is worn out and the motor slips while trying to turn it.

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DaGr81 Mentor

DaGr81

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yeah same, stupid aircon fan, errm expensive to replace these gears? motor or whatever? how about the hoses? its too bloody hot :) dont even feel like smoking coz its so hot, how about the problem with my gearbox? like it only happens when i turn the aircon on (cold) on heater its fine, once i couldnt get into any gears it would crunch even when i was at a stand still, but if i gave it a rest and came back few hours later would be fine, hence the reason i havent used my aircon for ages lol, try parking without being able to get into gear :P

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Jmaac Proficient

Jmaac

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That idle up then down is the clutch engaging the aircon compressor, which increases the load on the engine, and the AAC valve increases your idle to compensate so it doesnt stall. The drop down occurs when your thermostat is at the correct temperature and the clutch is disengaged from the compressor. Perfectly normal unless the Aircon switches aint working. The clicking sounds can also be the vents opening and closing, its a common problem apparently, the little plastic teeth come off the rails so im told??? but requires the whole dash to come apart - stuff that

I dont think the size of the molecule matters witht the aircon hose, I think its more the press fittings which are the issue, or any threaded joints especially if youve been moving/bending aircon pipes/hoses about the place to get your FMIC to fit. Take it to an aircon place, they inject a die into the cooling system to check for leaks, make sure you tell them o/wise theyll just fill it up and send you on your way - they love it, cos you come back in six months to get the same thing done. O/wise keep the windows down and make sure your heaters turned up - problem solved :D

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