740 and 760 - differences in air-conditioning systems?

[Laird Scooby]

You'll be able to transfer from one car to the other though? The under-carpet ducts should be similar as will the dash vents, the sunlight sensor on the left hand dash speaker grille might cause a headache though.

The body shells are pretty similar though, i know the 760 has a slightly different bonnet and wings but fairly sure the bulkhead is the same and the floorpan in the cabin. Those are the two main areas where you'll need them to be the same anyway.

[Bigfella666]

Scoobs

I have been scratching my head for the past hour knowing that you sent me a message or two which I had read today but did not find time to respond. Now discovered moderator has removed our respective posts. I thought the thrust of what we both said was highly pertinent, but seemingly not !

Thanks for the offer of coffee, will do one day, could have done 29 Dec also as visited Fishing Republic in Mildenhall so something got done on another rain filled day. Would be good to see your tank or do you prefer to call it the Jewish Canoe !!! ?

Always forget to ask my buddy who is of the faith, why JC !

[volvo always]

Originally Posted by tofufi

Thanks for the reply. I've possibly got an option to get hold of all the bits from a late 760 diesel, which has the ACC (the later fully automatic one). Wondering if it'd be possible to get the bits to fit my 740 diesel, which currently has heating only

I'll keep posting with progress if it goes ahead...

Good luck in retro fitting AC into your car

My 940 when I bought it had non working AC and I finally managed to get it to work

I had the existing system gassed/diagnostic and found out immediately leaking AC compressor and Condenser. £40 charge.
I Fitted a new nissens condenser £85, a right pig to undo the bolt out of the old ac condenser clamp to release the old ac pipes. Took me 7 hours on/off. Drilling, hammering and finally resorting to cutting the AC lines so I could remove what was left of the condenser so I could attack the clamp with more drilling and in the end a pointed bolster chisel.
Re joined the old ac pipes with 3/8th and 1/2 inch compression couplers.
Sourced a used matching compressor from ebay with warranty for £35.00.
Didn't have good tools or access to remove/replace compressor, quoted 150+vat. Got a garage to remove, replace and regas for £120.00

Found immediately that there was a large leak on the aftermarket o ring seals behind the condenser clamp so evacuated and I ordered Volvo ones.
Fitted Volvo ones and massively better but after a few weeks slightly weeps but so far still ok 6 months on! Garage re- gassed it for free but didn't know the amount to put in so has 500g, should have 950g.
Unfortunately I damaged the old clamp and they are not available for right hand drive vehicles. Would like to find a good one but most likely hard to remove unless bolt head snaps off! It's like a notched metal part with bolt hole in middle and connects to the bottom left of the condenser. Some 940 AC condensers seem to have screw thread connections instead, which should be easier to undue.

Good luck with your quest

James

[Laird Scooby]

Originally Posted by Bigfella666

Scoobs

I have been scratching my head for the past hour knowing that you sent me a message or two which I had read today but did not find time to respond. Now discovered moderator has removed our respective posts. I thought the thrust of what we both said was highly pertinent, but seemingly not !

Thanks for the offer of coffee, will do one day, could have done 29 Dec also as visited Fishing Republic in Mildenhall so something got done on another rain filled day. Would be good to see your tank or do you prefer to call it the Jewish Canoe !!! ?

Always forget to ask my buddy who is of the faith, why JC !

Jewish Canoe? Mine is either the Wee Beastie or the UAV - Urban Assault vehicle usually.

I can only guess Jewish Canoe refers to a barge capable of hauling many wares to be sold at a profit although i think they were popular round Golders Green so that might be another reason.

I think there were a lot of posts deleted wholesale on that other thread, got my ideas on the "why's and wherefore's" about it.

[Bigfella666]

Scoob

Thanx for the JC explanation, I suspect you are not a million miles off the mark !

Re the 850 thread I was tempted to point out to the moderator that if he wishes to be factually correct there were at least 2 posts ( yours and mine ) which far from being childish were in fact an invitation to others to search long and hard - for some manners and ( common ) decency if nothing else.

Am I to take it you live next door to a serviceman from good ol US and A ?

[Laird Scooby]

I haven't a clue if my guess is right, wrong or just one of the possibles. Someone may let us know one day!

I think our posts did have some sort of calming effect on that thread, maybe too little too late but then it took the mod a day or two to notice/act on it anyway. Shame as i was just getting into that cheese discussion!

With the exception of my immediate next door neighbour, if i look out my back door past a couple of fields, i'm literally about 5-600 yds from the edge of one end of the air base as the crow (or should i say F-15, soon to be F-22 and later F-35) flies so i'm about as reasonably close to being next door to the air base as most people would get.
There are a few USAF service personnel scattered around the (smallish) estate i live on the edge of though.

[tofufi]

Just a quick update...

I took the dashboard out of the 760 today. I also found that the vacuum for the control mechanism is taken from the brake vacuum pump - so it won't work with the engine off.

Is anyone able to identify this little thing in the engine bay? It's connected to the brake vacuum pump, and the vac hose goes from it for the climate control, but also connected (via narrow bore vacuum hose) to the intake manifold and fuel pump.



(the bit to the left and just below the connector blocks)

[Laird Scooby]

Is yours a turbo diesel? If so i'd make a guess (only a guess mind!) that it's some sort of valve to prevent boost pressure backfeeding into the brake servo and the heater controls.

[tofufi]

Originally Posted by Laird Scooby

Is yours a turbo diesel? If so i'd make a guess (only a guess mind!) that it's some sort of valve to prevent boost pressure backfeeding into the brake servo and the heater controls.

It is indeed a turbodiesel

That'd make some sense... I found it in this drawing...

https://www.volvopartswebstore.com/s...ssembly=235662

Part #18.

Not 100% how it's linked to the air conditioning yet... or perhaps it's not, and I was wrong when I looked at it

[Laird Scooby]

I suspect it's only linked to the air-con because of the vacuum on the heater controls, knowing Volvos descriptions can sometimes be a tad errr..... "misleading" maybe my guess is right, if not then if there are wires attached (difficult to be sure in your photo) perhaps it's linked in somewhere to some sort of electronic boost control.

I don't really know much about the D24TIC, the last Volvo diesels i worked on wouldn't fit in a car!

Was also about 20 years ago and just routine servicing, they were all computer controlled - press a button on the control pael and after it did its various checks, it would start itself up.