Aircon Issue 1JZGTE

[JZA70R_92]

ah i see the leccy reckons the evap or something in that area will freeze up as he reckons it needs to cycle off and on... hmmmm will give it a shot will also swap out the relay. ive got a 1J manual and it says ac water temp sensor seems to be only 1 wire that comes out of AC amp for it but cannot find on engine

[CrUZida]

Toyota AC's (at least the ones of that age) do not cycle electronically, they may do it mechanically though. (ie, they may be a mechanical valve in the system that stops it from freezing up, but the compressor does not disengage).

Regarding the AC water temp sensor I can't remember what I did on my UZA70, but I have vague recollections of having to bridge it out.

[Z2TT]

Hi,

I've never heard of clutch cycling in A70 Cars.

Your car should have a EPR/STV (Evaporator Pressure Regulator) (Suction Throttling Valve), that prevents evaporator freezing up.

Just keep constant 12v at the compressor but you should fix the problem as soon as possible. Remember that by having constant 12v to the compressor, this bypasses safety devices such as pressure switches so i'd be trying to get the a/c working normally as soon as possible.

[JZA70R_92]

well it must be something to do with that water sensor thing as after awhile it switched off again just went to shops then at shop I gave it a 12v kick start and all was ok for another 5kms then it went off again I dont think my car has that suction valve? I know of a 7M Z20 that had some wierd looking device near the strut tower mine doesnt have this hmmmmmm. im gonna go and ground that AC water temp sensor and see how she goes

[Z2TT]

Yeah turns out I might be wrong, Supras might not have it, in that case they might switch the compressor off via the A/C Amplifier by the input of the thermister in the evaporator, just guessing.

[JZA70R_92]

hmmmmm no good! bridged "water temp" wire only 1 to ground and no change same thing happens!

[Z2TT]

I don't know if this will help, but could you try turn the "Auto" Feature off on the climate control?
Something is causing the compressor to go off.

Does it vary between cold or hot days, any sort of pattern?

Maybe some faulty relays or wiring too relays?

[JZA70R_92]

auto feature is turned off. all wiring is orginal no chop and changing only addtion of abs and digital dash. Aircon worked in the wreck. one thing I noticed whilst doing my exhaust the pipe coming out of the firewall that leaks out excess mositure was still dripping at 5pm and the last time aircon ran was 10am that morning........ even happens at night!

[CrUZida]

That pipe is probably blocked (with leaves or similar).
Just needs cleaning out.

[matty12]

auto feature is turned off. all wiring is orginal no chop and changing only addtion of abs and digital dash. Aircon worked in the wreck. one thing I noticed whilst doing my exhaust the pipe coming out of the firewall that leaks out excess mositure was still dripping at 5pm and the last time aircon ran was 10am that morning........ even happens at night!

The evap not freezing up is it??


Does your blower fan slow when it shuts down??

[JZA70R_92]

blower fan doesnt slow down when it shuts down and all leaves were cleaned out as whole dash and aircon parts taken out. but I will double check. would it be ok to blow out through that pipe using my compressor? today it happend again almost straight away I bridged and all was ok for awhile......

[CrUZida]

Don't use a compressor.
Get under the dash, remove the lower panel and you'll see where the pipe leaves the evap box and goes through the firewall.
With a towel handy (it might still be full of water) pull the pipe off the box. You should just be able to blow it out.

[JZA70R_92]

by lower panel you mean the stock trim or the lower part of the white box??

[JZA70R_92]

just to add on the way to my 4am shift this morning it ran fine as in it started without me jumpering anything then again yesterday night before going to bed I started car and jumperd it and put relay back and it was ok the only thing is it didnt get a chance to not "kill it self" as car was on for about 5mins

[JZA70R_92]

ok this is wierd!! Before leaving for work this morning it was working.....I only tried it to see and it was ok no need as it was cool and windy. now I got to work and during lunch break deceided to try it again and it was dead again WTF?