2004 hdj100 air con issues

Submitted: Tuesday, Feb 09, 2016 at 19:31
ThreadID: 131572 Views:2005 Replies:8 FollowUps:4
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Hi All,
Has anyone had the issue where just as the AC is getting cold it shuts off and then restarts again.

Does anyone have a wiring diagram showing the relays?

The AC people and everyone else looking at it are scratching their heads, has plenty of gas and engine not hot but where is the hot engine thermostat in case it is faulty?

Thanks in advance
Cheers,
Dave
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Reply By: pop2jocem - Tuesday, Feb 09, 2016 at 19:50

Tuesday, Feb 09, 2016 at 19:50
Dave,

If you are talking about the switch that shuts the AC off if the engine cooling system reaches a set temp and if it's in the same location as the 1HD-FT engine (the non electronic fuel pump version of the 1HD-FTE) it's located in the top left hand side of the engine. From memory there were 2 switches in that location. One was for the AC and I can't remember what the other one was for off the top of my head. Might have been for the temp gauge on the dash or something to do with restricting the auto tranny upshifts.

Cheers
Pop
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Reply By: TomH - Tuesday, Feb 09, 2016 at 19:55

Tuesday, Feb 09, 2016 at 19:55
Join LCOOL and ask on their There is nothing they dont know about Toyotas
AnswerID: 596061

Reply By: 1533rl - Tuesday, Feb 09, 2016 at 20:00

Tuesday, Feb 09, 2016 at 20:00
Dave, had a similar problem with my pajero. Aircon would start off ok and then cut out, switch off for a few minutes and it would restart cold. Two regas and pressure tests by aircon "specialists" revealed nothing !
Auto sparky found the aircon relay was the fault, it would heat up and cut out, and it would cool down fairly rapidly. A $20 replacement fixed the problem. Can't help you with the location of it in your vehicle but it is a cheaper option to explore than a regas and pressure test.
Cheers
Peter
AnswerID: 596062

Follow Up By: 1533rl - Wednesday, Feb 10, 2016 at 17:04

Wednesday, Feb 10, 2016 at 17:04
Dave, from the replies and your responses you are experiencing exactly what I had. Very simple and cheap test to do. If you can identify the aircon relay (mine is in the main fuse box under the bonnet), start aircon and put your finger on the relay. If it gets too hot to touch, and the cool air flow inside has stopped, my money will be on the relay.
Good luck.
Peter
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Reply By: 2517. - Tuesday, Feb 09, 2016 at 20:07

Tuesday, Feb 09, 2016 at 20:07
TX valve,behind the glove box.
AnswerID: 596063

Reply By: Bushranger1 - Tuesday, Feb 09, 2016 at 20:20

Tuesday, Feb 09, 2016 at 20:20
G'day Dave,
I had a brand new Holden company car some years back that had similar symptoms.
There was a faulty pressure switch near the condenser that is supposed to protect the aircon compressor by switching it off if the refrigerant leaked away.

Apparently the refrigerant contains a pump lubricant hence the reason to make the compressor clutch disconnect.

Cheers
Stu
AnswerID: 596064

Reply By: maurice b - Tuesday, Feb 09, 2016 at 21:50

Tuesday, Feb 09, 2016 at 21:50
I have had this happen to me twice in the 13 years i have owned my HZJ105 . The first was the fan hub wasn't engaging proberly , Adding the Toyota silicon fix this . Second was a few weeks ago , air would be icy cold for approx 15 mins then run hot .If you manually switch it off for a few minutes then back on , it would be cold again. It was slighting down in gas, a top up fixed this . When i lived in Cobar western NSW a lot of 100/105 had air con drop outs in summer due to the heat coming of the hot bitumen tripping the air con sensor switch, most were the vehicle that had radiators that weren't operating efficiently .






AnswerID: 596075

Follow Up By: Life Member TourBoy, Bundaberg - Wednesday, Feb 10, 2016 at 07:53

Wednesday, Feb 10, 2016 at 07:53
Thanks, it isn't related to actual engine temp. It will do it when cold.
Cheers,
Dave
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Reply By: Life Member - Terry 80FTE - Tuesday, Feb 09, 2016 at 22:51

Tuesday, Feb 09, 2016 at 22:51
Make sure the condenser and radiator airways have good flow,
and that the fan clutch is working properly,
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Follow Up By: Life Member TourBoy, Bundaberg - Wednesday, Feb 10, 2016 at 07:53

Wednesday, Feb 10, 2016 at 07:53
Thanks, it isn't related to actual engine temp. It will do it when cold.
Cheers,
Dave
2010 Isuzu FTS800 Expedition camper
2015 Fortuner
Had 72 cruisers in my time

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Reply By: swampy - Wednesday, Feb 10, 2016 at 18:47

Wednesday, Feb 10, 2016 at 18:47
hi
check ac static pressure around 100psi both high and low side
220 on high side and around 20 psi on low side when running
suction line very cold when running


system short of gas causing operation of low pressure switch .[normal under low gas condition ]

evaporator very dirty causing very low temps due to fin blockage [drops temp quickly ] the thermostat/thermistor then cuts the compressor out .[ U can not feel the lack of air flow when the evap very very dirty ]

high pressure switch cutting out
check condensor clean and viscous fan appear to work no cracks or leaks

Evaporaters require cleaning every 100,000kms to maintain good aircon performance

swampy
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Follow Up By: Life Member TourBoy, Bundaberg - Wednesday, Feb 10, 2016 at 19:13

Wednesday, Feb 10, 2016 at 19:13
Thanks,
It is looking like a poor solder on the circuit board in the dash is the culprit. If it can't be repaired it will be up to $900 from mr yota if a wrecker hasn't got one.

Thanks all
Cheers,
Dave
2010 Isuzu FTS800 Expedition camper
2015 Fortuner
Had 72 cruisers in my time

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