Aircon problem 12HT Cruiser.

Submitted: Thursday, Feb 02, 2006 at 21:22
ThreadID: 30362 Views:2674 Replies:9 FollowUps:13
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On very hot days aircon cuts out after 10-15 mins, then restarts 10 min later. Repeats this a couple of times then works OK.Moderate temperature works faultlessly.Compressor not very old & aircon people can find nothing wrong. Of course it won't misbehave in the presence of a serviceman. Is there a provision for the A/C to cut out if engine overheats which could be malfunctioning? ie the motor doesen't run hot but maybe some sensor is saying it is. Any thoughts appreciated.
Mick.
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Reply By: Member - Phil G (SA) - Thursday, Feb 02, 2006 at 22:09

Thursday, Feb 02, 2006 at 22:09
Mick,

I had a 12H-T Sahara, and the air cond only worked intermittently. Problem ended up being the relay that sat under the RHS of the glove box - contacts weren't up to it. I disassembled the relay, cleaned the contacts and all was fine for a couple of years.

Cheers
Phil
AnswerID: 152612

Reply By: Des Lexic - Thursday, Feb 02, 2006 at 22:37

Thursday, Feb 02, 2006 at 22:37
Hopefully No 1 Member may respond but I know that with domestic air-cons, the heat exchanger freezes up on hot days and the A/C goes into heat to defrost the ice and then it will start cooling again. It could be something similar.
Des
AnswerID: 152622

Follow Up By: Member No 1- Friday, Feb 03, 2006 at 08:02

Friday, Feb 03, 2006 at 08:02
mmm? what?
are you trying to change the laws of reverse cylce airconditioning des?
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Follow Up By: Des Lexic - Friday, Feb 03, 2006 at 08:19

Friday, Feb 03, 2006 at 08:19
A common problem up here with the old window rattlers that freeze up in hot weather due to the heat exchanger freezing up and then going into heat to defrost the ice before cooling again. (On explanation provided by our local fridgy) BS??
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Follow Up By: Member No 1- Friday, Feb 03, 2006 at 08:37

Friday, Feb 03, 2006 at 08:37
des, in hot weather even a window rattler shouldnt freeze up...and i dont car how old it is....the temperature of the refrigerant should be well above freezing point. sounds like there is something wrong Des

In cold ..and i mean during winter cold...generally below 5c but may happen at around 8-10c the outdoor coil may begin to make frost and this could eventually cover all the outdoor coil reducing its ability (efficiency if you like) to pick up heat from the outside and deliver it to inside. When this happens, controls or sensors tells the aircon to do a de-ice...ie go onto cooling mode to defrost the outdoor coil so it can pick up heat...this cycle is usually only for a few minutes at most......

So des I think u have mis-interpreted what he said and have been wrongly applying it to the cooling cylce rather than the heating cycle
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Follow Up By: Des Lexic - Friday, Feb 03, 2006 at 09:24

Friday, Feb 03, 2006 at 09:24
You are truely Member No 1 Thanks for the enlightenment. o:)
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Follow Up By: Member No 1- Friday, Feb 03, 2006 at 09:31

Friday, Feb 03, 2006 at 09:31
see i can teach an old dog new tricks hahaha
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Follow Up By: Des Lexic - Friday, Feb 03, 2006 at 20:20

Friday, Feb 03, 2006 at 20:20
Who are you calling old.
I'm just a whipper-snapper
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Reply By: Tim HJ61 (WA) - Friday, Feb 03, 2006 at 00:50

Friday, Feb 03, 2006 at 00:50
Not a solution, but just putting my hand up for a similar problem. I probably get much more than 20 minutues, perhaps an hour, and just as I'm starting to get comfortable with the cooler temperature, things start to get hot again and the air cond is not working.

I find it resolves by turning off the fan and aircond for a while - during which we REALLY get hot - then it comes back on again really well.

As suggested the relay might be faulty as the fan seems to get slower - which it would do if the current wasn't getting through the relay properly.

Tim
AnswerID: 152644

Follow Up By: Member - Stephen M (NSW) - Friday, Feb 03, 2006 at 10:31

Friday, Feb 03, 2006 at 10:31
Hi there Tim sounds like your evep cood be freezing up which wont allow the cool air to flow through so when you turn off it defrost itself and you start the procedure again. Need to get a thermometor and stick in air vents when air is on while you are travelling aroung and see what temp it gets down to. if it starts getting in the - degres you need to turn up the thermostat just a mill or to then repeat the procudure. This mainly happens with air cons that arnt factory fitted and have a manual thermostat screwed to the evap box behind the glove box. Another way to check is pop the bonnet up when this happens and see if your compressor is still cut in. I had the same problem with my hilux due to it being after market air. They dont normally do it around town because you are starting and stopping all the time and they dont have time to freeze up but on a long run they do. Air con should work between the temps of 1 to 4 degrees coming out your air vents. And yes I fitted air con to toyota's for 4 years so I do have experiance with them. Regards Steve M
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Follow Up By: Member - Stephen M (NSW) - Friday, Feb 03, 2006 at 10:32

Friday, Feb 03, 2006 at 10:32
sounds like your evep could be ( spelling error)
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Follow Up By: Tim HJ61 (WA) - Friday, Feb 03, 2006 at 11:03

Friday, Feb 03, 2006 at 11:03
Steve,

Thanks for the suggestions. It's actually a factory fitted unit, but your reply and this thread has given me some good tips to track down the problem.

Air does get very cold at the vent, but the multimeter I bought so I could play with things such as this decided not to work on Temperature setting, so until I get a replacement I'll just be sticking with the Exploroz scientific - geez the air cond's good.

Thanks
Tim
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Follow Up By: Member - Stephen M (NSW) - Friday, Feb 03, 2006 at 11:10

Friday, Feb 03, 2006 at 11:10
No probs Tim yeah you cant go past the old nippondenso (toyota genuine) air con, best on the market I reckon, good things with toyota they normally have freezing cold air and a bloody great heater in the winter time. Take care Have a great weekend. Reards Steve M
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Reply By: Yeah Mate - Friday, Feb 03, 2006 at 06:44

Friday, Feb 03, 2006 at 06:44
Sounds like it could be due to hi temp/pressure cut out. Check your condenser is is not blocked up or obstructed, or maybe air was introduced when it was recharged.
AnswerID: 152654

Reply By: HJ60-2H - Friday, Feb 03, 2006 at 06:56

Friday, Feb 03, 2006 at 06:56
Same thing happens with my 2H powered 60. For me it is the A/C circuit breaker in the fuse compartment. Reset it manually or replace it with a fuse.
AnswerID: 152655

Follow Up By: Shane (QLD) - Friday, Feb 03, 2006 at 07:48

Friday, Feb 03, 2006 at 07:48
Seems very strange to me, I have a 1983 60 series 2H Sahara with after market Turbo, the air con is converted to the new gas & it's never given me any trouble even on the hottest day.
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Follow Up By: HJ60-2H - Saturday, Feb 04, 2006 at 07:28

Saturday, Feb 04, 2006 at 07:28
I agree that it is strange that anything would go wrong with a 60!!
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Reply By: Member No 1- Friday, Feb 03, 2006 at 08:12

Friday, Feb 03, 2006 at 08:12
not an expert on car airconditioning but...
the compressor has safety sensor/switches and will cutt out the compressor should they be activated. the system generally has cut out pressure switch high (condenser/discharge) and or low (suction/evaporator) and may also have or temperature sensor cold (suction/evaporator) or hot (discharge /condenser) depnding on the make model etc etc of aircon.

sympton of intermittent only on initial start up is odd....this could point to electrics porr contacts loose ? rather than safety switches. If it were a system fault i would expect it to happen always not just a few times and then stop.

when it stops do you do anything ...or do you just leave it and wait for it to restart. if the answer is wait, then i'd be looking for faulty wiring/contacts
AnswerID: 152665

Reply By: jon p qld - Friday, Feb 03, 2006 at 23:02

Friday, Feb 03, 2006 at 23:02
It certainly sounds like the evaporator is freezing up, you mentioned that the compressor is not very old, therefore the system may have been overcharged with too much gas when the compressor was fitted.
Jon
AnswerID: 152841

Reply By: Sam from Weipa Auto Electrics - Saturday, Feb 04, 2006 at 09:36

Saturday, Feb 04, 2006 at 09:36
Its sound like its freezing up for sure have you got good airflow out of the vents because on older vehicles the evaporater block's up for all the crap building up on it. also it can be overcharging of gas thats causing the same problem. or a mix of both. cheers sam
AnswerID: 152888

Follow Up By: micknjoan - Saturday, Feb 04, 2006 at 16:16

Saturday, Feb 04, 2006 at 16:16
Thanks to all who replied. Beginning to eye circuit breaker with suspicion as the experts(?) appear to have canvassed the other options. Mick.
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Reply By: 100TD - Sunday, Feb 05, 2006 at 00:19

Sunday, Feb 05, 2006 at 00:19
on some recent hot days in melbourne for the first time ever my a/c did similar things to this and it ended up being too much gas (had about 850g was reduced to 700g)and it has been OK since .Paul
AnswerID: 153042

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