100 series air con drop out

Submitted: Tuesday, Feb 22, 2005 at 21:32
ThreadID: 20676 Views:4697 Replies:10 FollowUps:18
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going from hedland to perth for our yearly family do, the a/c cut out between fortesque and carnarvon. the outside temp was 53deg [47 deg in hedland] this particular day and didnt cut back in til the sun had dropped. 42 deg felt good at 7.30pm after such a scorcher. never had any problems until the trip back where a/c did the same thing. hedland toyota said there is nothing they can do about it. apparently its a thermal cut out thing. it works ok around town and on w/ends
away.
was hoping someone out there has a cure or a safe-ish way of bypassing the thermal
switch
Cheers
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Reply By: utemech - Tuesday, Feb 22, 2005 at 21:52

Tuesday, Feb 22, 2005 at 21:52
go and see a good Air Con repairer as this should not happen and don't rely on Toyota Service there good but don't look out side the circle. Good Luck
AnswerID: 99573

Follow Up By: utemech - Tuesday, Feb 22, 2005 at 22:00

Tuesday, Feb 22, 2005 at 22:00
Toyota may not have told you but in very hot climates you should have the air con serviced every 12 mths as the new 134r systems can loose oil out of the gas due to the high temps it cloggs the drier.
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Reply By: Matho - Tuesday, Feb 22, 2005 at 21:53

Tuesday, Feb 22, 2005 at 21:53
Where abouts is Hedland?
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Follow Up By: Skinnydog - Tuesday, Feb 22, 2005 at 21:56

Tuesday, Feb 22, 2005 at 21:56
600 km south of broome
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Follow Up By: Truckster (Vic) - Tuesday, Feb 22, 2005 at 21:57

Tuesday, Feb 22, 2005 at 21:57
www.travelmate.com.au and search ;)
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Follow Up By: Matho - Tuesday, Feb 22, 2005 at 23:23

Tuesday, Feb 22, 2005 at 23:23
i still can't find it? Where is Hedland. Can some tell me where it is?
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Follow Up By: Skinnydog - Tuesday, Feb 22, 2005 at 23:34

Tuesday, Feb 22, 2005 at 23:34
sorry that you are geographically challenged, i'll make it esier for you by calling it port hedland
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Follow Up By: Kimberly Kruiser - Tuesday, Feb 22, 2005 at 23:57

Tuesday, Feb 22, 2005 at 23:57
Lets not forget South Hedland either.!!!!
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Follow Up By: Matho - Wednesday, Feb 23, 2005 at 00:04

Wednesday, Feb 23, 2005 at 00:04
I know where Port Hedland and South Hedland is, I was born there. But I still can't find "HEDLAND" on any map.
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Follow Up By: Skinnydog - Wednesday, Feb 23, 2005 at 00:29

Wednesday, Feb 23, 2005 at 00:29
drink your shandy's at the port heddie do ya
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Follow Up By: Skinnydog - Wednesday, Feb 23, 2005 at 00:50

Wednesday, Feb 23, 2005 at 00:50
A Taswegian once told me that some people think Tassie is the asshole of Australia but he reckoned that Hedland is about 6000 kms UP it.
It's also the place where some kids copied Jackass but turned it into Dumbass
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Reply By: Kimberly Kruiser - Tuesday, Feb 22, 2005 at 22:36

Tuesday, Feb 22, 2005 at 22:36
Skinnydog

Had the same experience when travelling to Kununurra, towing van in 45 degree
heat a couple of years back in a 75 series with 1HZ and original Tojo aircon. I found that a decrease in forward momentum reduced engine temp and a/c came back on line. Thankfully.
Had some a/c repairs done sometime after that and enquired about the same thing as you, bypass thermal cut out. I was told at the time by the alledgedly competent air con man that it couldn't be done. Having since found that competent isn't a part of the alledged air con mans vocabulary I would also be interested if there was an alternative. Good luck.

Cheers WAL
AnswerID: 99587

Follow Up By: Skinnydog - Tuesday, Feb 22, 2005 at 23:29

Tuesday, Feb 22, 2005 at 23:29
i had one air con guy tell me about a hilux with same problem, he checked everything and all was ok, said he changed engine thermostat and problem was fixed. to my mind if thermostat was faulty up our way it could only be stuck shut which means over heating at the least. i think my problem is recreating 50 plus days to see if it is a temp switch or over pressure switch problem
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Reply By: fisho64 - Tuesday, Feb 22, 2005 at 22:39

Tuesday, Feb 22, 2005 at 22:39
Shouldnt be able to lose oil as it travels with the gas through the system,
most AC have a low pressure cutout which prevents operation when refrigerant drops and hence oil is lost, some also have a high pressure cutout which will activate when it undercondenses such as with very hot conditions or blocked fins(all commercial refrigeration has them) This prevents the compressor cooking or the system releasing all the refrigerant. One thing that could cause this problem is if the system is overcharged with gas. Check that the condensor fins are clear and in good condition first though.
BUT disconnecting the thermal cutouts is like taking the bulb out of your oil lite or turning the stereo up when the V-belts start squeeling.
Of course this assumes that there isnt a fault with the cutout (and I bet there isnt, its doing what its supposed to)

Incidentally, if you lose gas from any system look for the oil stain as that will be where the leak is (or was!!)
AnswerID: 99590

Reply By: Member -Dodger - Tuesday, Feb 22, 2005 at 23:07

Tuesday, Feb 22, 2005 at 23:07
Nissan Patrol Gu does the same on a scorcher.
The cut out not only saves the air con from damage but also helps stop the donk from cookin.
Just back off a bit and it should cool down or turn off the air for a bit.
I have the same trouble when towing the van on a scorche, my solution find a swimming hole and veg out.r
I used to have a handle on life, but it broke.

Cheers Dodg.

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AnswerID: 99597

Follow Up By: Skinnydog - Tuesday, Feb 22, 2005 at 23:20

Tuesday, Feb 22, 2005 at 23:20
yeah iv'e heard it happens to patrols and new hiluxes as well.
thing is, engine temp never got over half and i dropped speed back to 95kms for about 1 hour to no avail, plus the condenser fins are clean as,
there are no leaks any where. we were travelling on two extreme days however that is when you really want it to work
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Reply By: Chaz - Wednesday, Feb 23, 2005 at 00:03

Wednesday, Feb 23, 2005 at 00:03
Hi Skinnydog,

We have had many 80 & 100 series cruisers in our fleet, with the same problem in extreme heat. There are two cures that I know of that work. We take them back to Toyota and get them to release a bit of pressure and that helps, but I have found that the problem also lies in the under-bonnet temps, so driving around with the bonnet up on it's catch is a sure cure, although you would want to keep the vehicle speed at a steady pace so as not to loose a bonnet.

Chaz
AnswerID: 99610

Follow Up By: Skinnydog - Wednesday, Feb 23, 2005 at 00:39

Wednesday, Feb 23, 2005 at 00:39
Sounds the go about the pressure reduction. I did a topic search later rather than sooner, apparently the higher pressure works good in the cooler areas, not so good the hotter they get
Cheers Chaz and everyone else
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Reply By: Member - Davoe (WA) - Wednesday, Feb 23, 2005 at 22:05

Wednesday, Feb 23, 2005 at 22:05
unplug the temperture sender to the air con. fixes the problem straight away
AnswerID: 99803

Follow Up By: fisho64 - Thursday, Feb 24, 2005 at 04:27

Thursday, Feb 24, 2005 at 04:27
and remove the oil lite when youve got no oil left
Do it if its someone elses car, wouldnt if it was mine!!
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Follow Up By: Member - Davoe (WA) - Thursday, Feb 24, 2005 at 09:02

Thursday, Feb 24, 2005 at 09:02
how right you are! it was a hire car I was shown it on
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Reply By: Member - Jeff M (WA) - Thursday, Feb 24, 2005 at 12:38

Thursday, Feb 24, 2005 at 12:38
The surf's aircon cut's out when the engine temp is getting too high. Even if the guage has not moved that much it's obviously an ambiant air sensor or similar. Backing off thr throtle would porbally help. Also I find once it's cut out you have to drop the engine temp back quite a way before it will cut back in, other way around it is to turn the air con off for a couple of mins after you have backed off then switch back on, that must do some kind of reset.
The other thing to do may be to get a good engine radiator flush and new Yoto LLC coolant put it, check the viscous clutch fan. Maybe that the beast is not handling the heat that well to start with.

I may be way off track, but that's how the surf works and I can only imagine the other Yotas are similar.
AnswerID: 99909

Reply By: warnsey - Thursday, Feb 24, 2005 at 15:06

Thursday, Feb 24, 2005 at 15:06
I had the same proble the other week driving from Hedland to Woodie Woodie (2 hours east of Marble Bar) in a hire 100 series found by dropping from 130 to 110 seemed to help
AnswerID: 99930

Reply By: bundyman - Thursday, Mar 03, 2005 at 11:40

Thursday, Mar 03, 2005 at 11:40
I know I'm a bit late in a reply (just got back from holiday) but as Davoe said earlier if its a 1HZ motor they have a high water temp cutout switch on the A/C. This sensor will turn the A/C off if the water temp gets above a set point (to stop putting more thermal load on radiator). The sensor is on the RHS of the engine at the top front. It is a plastic plug with 2 wires coming out of it (it is in line with your radiator hose).
Those two wires on my cruiser had corroded to the stage that the A/C cut in and out randomly and it took me AGES to figure out why the A/C would stop and start. Simple fix was to short the 2 wires together. This wasn't ideal but got my A/C running.
There will be an explaination of it if you read the Gregory's Manual. I only found this problem by mistake, saw the corroded wires and then looked into the book to see what the part did and then bingo - thats why my A/C wasn't working.

Hope this helps.

Cheers,
Hughesy
AnswerID: 100953

Follow Up By: Member - Jeff M (WA) - Thursday, Mar 03, 2005 at 12:59

Thursday, Mar 03, 2005 at 12:59
Actually this is a really cool thing, I've been trying to work out a simple way to hook up a Buzzer for over temp on the surf.
Reason being that when your battling a boggy beach or steep sand dune on a hot day the last thing your looking at is the dash! The problem is that's when the temp guage is at most risk of climbing!

By the sounds of it this sensor is just an open/close type? Would that be correct? If so I could tap into that and run a relay that operates a warning buzzer when the water temp get's up, at least then you could keep an extra eyeball on the temp guage!

Wadda ya reckon?
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Follow Up By: bundyman - Thursday, Mar 03, 2005 at 13:58

Thursday, Mar 03, 2005 at 13:58
Yeah Jeff that sounds like a great idea. Your dead right - when the going is tough and the thing is most likely to overheat, the last thing your doing is monitoring the temp gauge. I just found (living in hot climates where the A/C is nearly always going) that the cut out is one of the best alarms to have. Its amazing how quick you look at the gauges when the A/C stops. But a buzzer would certainly get your attention. I've also put a low water alarm into the rad tank as extra security. No need to check the radiator levels everyday.

Cheers,
Hughesy
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Follow Up By: Member - Jeff M (WA) - Thursday, Mar 03, 2005 at 14:14

Thursday, Mar 03, 2005 at 14:14
"Low Water Alarm"

How hard, where does it go, how much?? Sound great.

Yeah that's how I've noticed the temp rising on the surf in the past is by the air con cutting out, however if it's going up quick (which one the rad's saturated with heat it normally does) it can take a few seconds for the air to heat up comming out of the vents from when the air con cut out. It would be nice to have the warning a little earlier and a little more defniate. It would also be good for when the missus is driving the car, a screaming buzzer means stop, air con not working means I can get home! AHRRG! My wallet is getting all teary eyed at the thought...
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Follow Up By: bundyman - Monday, Mar 07, 2005 at 09:45

Monday, Mar 07, 2005 at 09:45
Jeff,

Available from "Ashdown" which are a wholesale auto electrical chain in NSW - a bit like Repco. I'm not sure if they are in WA but just get them to mail the unit to you - cost me $10. The unit for the cruiser was around $115 and it is very simple to wire up and just has a sensor that goes in to the top of your radiator tank. You can actually have it to cut the engine out if water is lost from the tank - good for us "ignore everything underground miners". Good luck champ.

Cheers,
Hughesy
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