Thread: What happened to your D3/D4 today?

Originally Posted by Bulletman

Depending on where the pressure is read from , the low or high side.

The sensor on the D3 is a high side sensor. If you're not seeing at least 5 bar on a day like today (in Perth anyway) regardless of the hour then there's a problem.

Originally Posted by BradC

The sensor on the D3 is a high side sensor. If you're not seeing at least 5 bar on a day like today (in Perth anyway) regardless of the hour then there's a problem.

My old refrigeration teacher would go thru to make sure you had the correct gauges for refrigerant drill followed buy every other not pumped down, failed sensor reading etc etc but if any refrigerant gauges are reading low then yes you have an issue..

When you are used to working with systems that hold 500kgs + of refrigerant it’s a learning curve for low capacity systems and I am sure your diagnosis is correct in this case , sadly my curious mind find a total loss of refrigerant a rare situation especially if you haven’t been playing around with any major parts of the system

Cheers Bulletman

Originally Posted by Bulletman

When you are used to working with systems that hold 500kgs + of refrigerant it’s a learning curve for low capacity systems and I am sure your diagnosis is correct in this case , sadly my curious mind find a total loss of refrigerant a rare situation especially if you haven’t been playing around with any major parts of the system

Cheers Bulletman

Yes but. With rare exception systems that hold 500kg don’t have multiple o-ring/clamp seals on the pipe work and an open drive compressor with a rotating mechanical seal (at least these days). Vehicles are a harsh environment and the pipe work seals are robust but subject to failure. Particularly anything Ford had anything to do with. Couple that with 525g of gas and there’s bugger all reserve. 2kg of R12 lasted a lot longer with a small leak.

Anyway, if the gap indicates low pressure it’s either a failed high side sensor or a leak. I know which one I’d be wagering. That’s like asking “HPFP or faulty rail sensor”….

Originally Posted by BradC

Yes but. With rare exception systems that hold 500kg don’t have multiple o-ring/clamp seals on the pipe work and an open drive compressor with a rotating mechanical seal (at least these days). Vehicles are a harsh environment and the pipe work seals are robust but subject to failure. Particularly anything Ford had anything to do with. Couple that with 525g of gas and there’s bugger all reserve. 2kg of R12 lasted a lot longer with a small leak.

Anyway, if the gap indicates low pressure it’s either a failed high side sensor or a leak. I know which one I’d be wagering. That’s like asking “HPFP or faulty rail sensor”….

Ahh yes, I know all about the HPFP and fuel rail sensor.. purchased a new sensor which threw even more faults after being installed, so a HPFP plus a LPFP later installed the original sensor out of frustration and the car ran fine again.

The HPFP was definitely suspect but I think the LPFP was still ok but guess it was a lesson learnt the hard way.

Bulletman

Originally Posted by BradC

The sensor on the D3 is a high side sensor. If you're not seeing at least 5 bar on a day like today (in Perth anyway) regardless of the hour then there's a problem.

Gap indicated 3.6psi and theres also a B1B78-84 System pressure -Bus signal/message failure - signal is below allowable range fault logged in the ventilation system

Originally Posted by BradC

That’s like asking “HPFP or faulty rail sensor”….

Ha!

Wiper motor replaced thanks Dave (Airmech) ,gear is stuffed.

Working through getting the correct discs for the rear and decided to also replace the park brake shoes. Quote from the dealer just shy of $500. Bendix shoes from Supercheap $68. I not always cheap, but in this case I know which way I’m going.

It also seems that following the Bodsy Brake routine leaves the park brake shoes just slightly skimming the disc based on the wear on the inside of my discs which is quite pronounced. I then took a look at the workshop manual and it specifies to back the pads off further than the Bible says which might explain that. It also explains to me why it needs annual adjustment given the drag and pad/disc wear. And no, I don’t use drive off mode and use my park brake each time.