Air Con confusion-Climate Control

I re-gassed and serviced the air con today.
Purged and replaced probably the original gas with 134.
The problem is power to compressor clutch. I had to bridge the relay contacts to engage compressor and do the re-gas.
ECU Talk shows the relay is on and has power to relay, checked with multimeter.
I can bridge the contacts at the relay to engage the compressor clutch and the AC works great.
The auxiliary fan won't work unless bridged at that relay as well.
The interior fans, doors etc work well, self diagnosis shows no fault, fuses and relays checked and replaced as a matter of course.
What's going on here?

 

if its stock, the aux fan does not come on with the aircon until water temp is above normal about 90c
cant help you with the a/c clutch could be a few things good luck
Linton

 

check the switch on the dryer bottle is working. Bridge it out and see if the compressor starts

 

Is this the pressure safety switch near the AC low and high pressure connectors?
This was not changed from a R12 original type to R134 type when we switched the gasses.

 

I think the dryer bottle is attached to the driver's side chassis rail inside the front bar, infront of the radiator.

 

Is that down by the AC filter?

 

filter /dryer same thing, as mentioned you get to it from the front may have to drop the lower guard from the bumper to make it easier, has a switch on the top with 2 wires.
I know you said it worked ok by tripping the relay but if it is low on gas it probably wont work either.

 

If you have ConZult available, the clutch can be operated/tested.

 

Just filled it with R134A on Wednesday

Only have ECU talk which is a bit limited. Have tried to download ConZult but no luck. Maybe it doesn't like windows 8?

 

I have all the free diagnostic software to use with the ECU talk cable working in windows 8 no problems, doesnt help with your air con, but just wanted you to know win8 is fine

 

The free version of ConZult won't cut it.
This is what is required:
http://300zx-twinturbo.com/conzult/scrnshts.htm

 

Thanks for the tip. I removed the front cover and discovered that the wiring to the receiver/dryer had been disconnected as the wiring block would not clear the pipes of the inter cooler. So we removed the wiring from the block connected up the wiring and the AC and fans worked correctly.
Circuit completed and everything good

 

Not sure how familiar you are with AC stuff but that switch is a pressure sensor to preserve the compressor if you lose the gas, if the AC ever seems to stop being cold turn it off and check that it still has pressure or you'll burn out the pump.

 

well done