100 series air con drop out
Submitted: Tuesday, Feb 22, 2005 at 21:32
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Skinnydog
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
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
FollowupID:
357905
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 - 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: 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?
FollowupID:
359014
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
FollowupID:
359018
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...
FollowupID:
359021
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
FollowupID:
359352