Thread: A/C issue

the compressor described is a late model denso delphi,zexell,sanden compressor.
these run constantly and change the swashplate stoke.like the old industrial unloading systems.

to save a few dollars there is no electric coil or compressor clutch.

later cars have plastic pulley.a plate relaces the friction clutch,in the center is a die cast or plastic nut.this has a breakaway section to shear off in the case of compressor issues.inside it has a rubber drive to reduce noiseremanufactures have these but the dealer dont.had to make these plates for benz cars and most of these compressors are now made in china.

not uncommon for the plate to shear of just from vibrant driving.

the original version had a aneroid in the rear of the compressor to control the a/c at set temp.hot water is used to climate control the vehicle.

later versions has a duty cycle solinoid to control the temp and economy mode.turned off these run at 10% to circulat oil.most of these can be direct conected to power to get 100% and then pressure switched.

Originally Posted by Davehoos

The compressor described is a late model denso, delphi, zexell or sanden compressor.
These run constantly and change the swash plate stoke, like the old industrial unloading systems.

To save a few dollars, there is no electric coil or compressor clutch.

Later cars have a plastic pulley. A plate replaces the friction clutch; in the centre is a die cast or plastic nut. This has a breakaway section to shear off in the case of compressor issues. Inside, it has a rubber drive to reduce noise. Remanufactures have these but the dealer don't. Had to make these plates for Benz cars and most of these compressors are now made in China.

Not uncommon for the plate to shear off just from vibrant driving.

The original version had a aneroid in the rear of the compressor to control the a/c at set temp. Hot water is used to climate control the vehicle.

Later versions has a duty cycle solenoid to control the temp and economy mode. Turned off, these run at 10% to circulate oil. Most of these can be direct connected to power to get 100% and then pressure switched.

That explains why there is no clicking sound from the compressor clutch as there now is none.

I see on the electrical pdf, a refrigerant solenoid valve, D332, so as you referenced, that must be what turns the compressor on and off, (so to speak). I see that there appears to be three variations of the solenoid valve depending upon the engine, diesel, V6, or V8.

Thanks for your comments re the 10% rate. The old style used to cycle when the defroster was turned on just to make certain oil circulated in the winter months. I wondered just what my AC compressor was doing in the winter as I never would hear any sounds. That explains it.

In australia we use the defost with fresh air to defog.the compressor wont engage untill the vent temp reaches the 0-5 deg mark.so in efect you need the heater going to get the ac to work.

the jeep wrangler owners manual shows a wire being moved for winterisation,after study of the picture i worked out it was unplugging the comp over heat switch and disconected the comp.I was fitting an aftermarket unit that had no off switch.

a problem with cold climates is the a/c suction side becomes liquid and the compressor oil goes solid.often you only want the compressor to work unless the engine bay is hot.as the systems get smaller the chance of flooding increases.most of the old accumilator systems the gas volume was simply stored in a chamber as a saftey space.

to ovecome a hydrolic locked comressor often the old compressors engage on crank over,and lots of australian cars had a relay conected to the reverse.

the toyota hilux turns the compressor on twice after startup.my falcon has a pressure transducer same as in the us fords.if the pressure dont change to the preset amount the compressor code is set and cant be turned on.

Originally Posted by Davehoos

In Australia we use the defrost with fresh air to defog. The compressor won't engage until the vent temp reaches the 0-5 deg mark. So in effect you need the heater going to get the ac to work.

The Jeep Wrangler owners manual shows a wire being moved for winterization; after study of the picture I worked out it was unplugging the comp over heat switch and disconnected the comp. I was fitting an aftermarket unit that had no off switch.

A problem with cold climates is the a/c suction side becomes liquid and the compressor oil goes solid. Often you only want the compressor to work unless the engine bay is hot. As the systems get smaller the chance of flooding increases. Most of the old accumulator systems the gas volume was simply stored in a chamber as a safety space.

To overcome a hydraulic locked compressor, often the old compressors engage on crank over, and lots of Australian cars had a relay connected to the reverse.

The Toyota Hilux turns the compressor on twice after startup. My Falcon has a pressure transducer same as in the US Fords. If the pressure don't change to the preset amount, the compressor code is set and can't be turned on.

After reading the above, keeping a Land Rover air suspension system operational would be easy for you.

Relative to air conditioning, our Land Rover air suspension compressor is simple. At least the compressor only has to deal with a gas, not both a gas and a liquid; leaks do not matter all that much, and air temperature does not really affect its operation significantly either.

I did not realize that there were all these complications to automobile AC. I thought it was just putting a fridge on wheels - wrong again.