Air Con Transfer from TD to TD advice please

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Re: Air Con Transfer from TD to TD advice please

Post by Kitch »

BX Bandit wrote:Ummmm, why not leave in t'grey one then? That seems like robbing Peter to pay Paul (whoever they are)
Well, because the red one is a nicer car.

And since an hour ago, the grey one's future is looking bleak :(
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Re: Air Con Transfer from TD to TD advice please

Post by BX Bandit »

/\ Yes, I see what you mean.

Matt, so you have RS24? And what did you HAVE to do (it sounded like you replaced seals but didn't have to?)
How long is it between 'top-ups'? Did they add this 'barrier' along with the refrigerant to prevent it leaking out the pipes?

I'm now thinking I'll go for a drop in replacement, mostly based on cost grounds
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Re: Air Con Transfer from TD to TD advice please

Post by mat_fenwick »

Apparently I didn't HAVE to change the seals to the green neoprene type with RS24, but seeing as the system was in pieces I needed to change the O rings anyway! I don't know if anything else was added with the refrigerant, but I thought the idea of a drop in replacement was that you just put it in with no other changes required. It will have been in 7 years this May, with no top ups required so far and still blowing the same temperature (by feel) as it did to start with.

I know Phil C had to top up a system with RS24 every year, so perhaps he had an underlying leak. Or perhaps the old seals aren't ideally suited to RS24?
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Re: Air Con Transfer from TD to TD advice please

Post by citsncycles »

I've no experience with air con, but with the age of our cars, I'd expect that there would be seals in many systems that are past their best regardless of the coolant used, so would probably benefit from replacement anyway.
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Re: Air Con Transfer from TD to TD advice please

Post by BX Bandit »

When the cabin heater temp is set to cold, the fan speed increases to almost Max. What is the reason for this? Is it to stop something (Evap valve?) freezing up? Personally I find it annoying. Or is it supposed to be a sort automatic 'oh, you want cold mate? I'll up the fan speed for you then?'
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Re: Air Con Transfer from TD to TD advice please

Post by BX Bandit »

Also, are the red and yellow lights of death operated differently on a BX with a/c? I'm sure there was a separate control unit? Or are both switches condensed into one?
My red and yellow lights flash on and off at will, despite the engine not being hot enough, although curiously, the yellow lamp is the always the first to illuminate and the last to extinguish
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Re: Air Con Transfer from TD to TD advice please

Post by Way2go »

BX Bandit wrote: My red and yellow lights flash on and off at will, despite the engine not being hot enough, although curiously, the yellow lamp is the always the first to illuminate and the last to extinguish
Bandit, the yellow lamp is the lower temperature so that behaviour would be correct when overheating.

If you're sure that the engine is not overheating it could possibly be a slight furring up of the waterways in the head, near the sensors. Some years ago I had some spurious illumination of the red lamp and although the gauge was riding slightly higher, the coolant was well below boiling.

Treating the system with "Barr's Professional Flush" sorted that and the red light has behaved itself since.
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Re: Air Con Transfer from TD to TD advice please

Post by mat_fenwick »

BX Bandit wrote:When the cabin heater temp is set to cold, the fan speed increases to almost Max.
I think only on AC cars, the full speed relay is only enabled when set to fully cold. Certainly there is (now removed in my case) a SPCO microswitch on the temperature control dial to bypass the relay unless fully cold. Much wine has been consumed this end, so I can't quite figure out why that would cause a change in speed unless the speed dial was already on max. though...
Also, are the red and yellow lights of death operated differently on a BX with a/c?
Yes (possibly). From memory, there is a system to cut the AC if the engine overheats. I think one of the temperature switches has a two pin connector, but my AC donor car had the standard arrangement so it was only from my research that I remember this. Whether it had been bodged back to standard, or some AC systems had the normal arrangement I don't know.
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Re: Air Con Transfer from TD to TD advice please

Post by BX Bandit »

mat_fenwick wrote:
BX Bandit wrote:When the cabin heater temp is set to cold, the fan speed increases to almost Max.
I think only on AC cars, the full speed relay is only enabled when set to fully cold. Certainly there is (now removed in my case) a SPCO microswitch on the temperature control dial to bypass the relay unless fully cold. Much wine has been consumed this end, so I can't quite figure out why that would cause a change in speed unless the speed dial was already on max. though...

Yes - only on A/C cars. I was thinking of removing the switch as well but it actual fact, it'd be a useful function if it only did it when the a/c was on, but not when the a/c is off.



Also, are the red and yellow lights of death operated differently on a BX with a/c?
Yes (possibly). From memory, there is a system to cut the AC if the engine overheats. I think one of the temperature switches has a two pin connector, but my AC donor car had the standard arrangement so it was only from my research that I remember this. Whether it had been bodged back to standard, or some AC systems had the normal arrangement I don't know.
I'll get off my butt and look at the wiring diagrams, but the car won't be furred up or over heating, the yellow and red lights blink quickly on and off suggesting an electrical fault, whereas if it were an over heating fault then I'd expect there to be at least minutes of delay between the red and yellow lamps going on and off.
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