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Car Forum / Australian Car Forums / General Car Topics (Australian group) / February 2005VL aircon
Guys Just wondering if anyone here can tell me under what conditions the fan infront of the A/C condenser is supposed to turn. Is it meant to come on when the AC switches on, or only when the car reaches a certain temperature. It never seems to turn on. The AC works great when the car is moving but is a shocker when in traffic, so i am thinking this fan is meant to be doing something. Any ideas or wiring diagrams for me to check. thanks > Guys > > Just wondering if anyone here can tell me under what conditions the fan > infront of the A/C condenser is supposed to turn. Is it meant to come on > when the AC switches on, or only when the car reaches a certain temperature. > It never seems to turn on. Its supposed to turn on with the A/C. Daryl >> Guys >> [quoted text clipped - 4 lines] >> >Its supposed to turn on with the A/C. It's actually switched on by the medium pressure switch on the receiver/drier. >>Guys >> [quoted text clipped - 6 lines] > > Daryl The fan only runs when the pressor switch turns it on eg when the gas temp therefore pressor exceeds a preset level. Common mod to improve the cooling when retrofitting for 134a is to connect the fan to the compressor clutch through a relay to make it run with the compressor. Highgate do a kit > >>Guys > >> [quoted text clipped - 11 lines] > compressor clutch through a relay to make it run with the compressor. > Highgate do a kit Must be different to the VK which switches the fan on as soon as the A/C is turned on. Daryl >Guys > [quoted text clipped - 7 lines] > >Any ideas or wiring diagrams for me to check. It's switched on by the medium pressure switch on the receiver/drier through relay B. Power fed from fuse #8 (batt) and control circuit fed via fuse #13 (acc) which also feeds the vent_fan_control/comp_clutch/FICD. I've found a number of these dual pressure switches that have failed on the MP contacts. Quick test: pull out the plastic grille, locate the switch assembly on the receiver/drier. With the ignition switch in the ACC position, bridge the blue and black wires at the connector. The aux fan should run. If you have broadband I could email you a .jpg of the schematic. Budgie, thanks for the info. jpg of the schematic would be great. email to gst74@<nospam>telstra.com thanks budgie wrote in message ... >It's switched on by the medium pressure switch on the receiver/drier through >relay B. Power fed from fuse #8 (batt) and control circuit fed via fuse #13 [quoted text clipped - 6 lines] > >If you have broadband I could email you a .jpg of the schematic. >Budgie, > >thanks for the info. jpg of the schematic would be great. > >email to gst74@<nospam>telstra.com .pdf (smaller) en route Thanks Budgie. The medium pressure switch has stopped working. Looks like i will have to replace it or wire up the fan to switch on with the compressor > >Budgie, > > [quoted text clipped - 3 lines] > > .pdf (smaller) en route >Thanks Budgie. > >The medium pressure switch has stopped working. > >Looks like i will have to replace it or wire up the fan to switch on with >the compressor Depends what you want. Ideally a (road-)speed switch IMHO. If you do the sums on the air velocity through this fan you will fairly quickly realise that at or above certain road speeds in the gear of your choice, the aux fan actually SLOWS DOWN the airflow through the condenser/radiator that would otherwise occur from the radiator fan alone. The speed at which it effectively "free-wheels" when powered is obviously the point where it should be tuned on/off. However that's too hard, so most times I recommend you simply fit a dashboard switch across the MP switch, just grounding the blue wire from relay B. That way you can have some extra air in traffic jams even when the a/c is off. "gst" > Guys > [quoted text clipped - 3 lines] > temperature. > It never seems to turn on. it is my understanding that from the factory, there is a relay attached to the drier which operates the fan at a certain temp. When my car was fitted to accomodate the new gas, the auto electrician wired the fan to come on whenever the compressor is turned on. At this time of year the fan should be operating most of the time - especially once you've stopped moving forward. > The AC works great when the car is moving but is a shocker when in > traffic, > so i am thinking this fan is meant to be doing something. I have the same problem, but I always thought it was due to a lazy compressor. If you are stopped, and give it some pedal (around 3000rpm) this juices up the compressor a bit more and will probably help deliver cooler air. This may also be effective because the radiator fan will draw more air through the condensor with increased revs. Not a solution of course. Perhaps you need to regas the AC ? > Any ideas or wiring diagrams for me to check. > thanks Sounds like yoru low on gas and the low revs arent enough to get the gas thats in there working. Had similar issue that was rectified with my toyota. A little R22 extra and away I went ICE COLD! > Guys > [quoted text clipped - 11 lines] > > thanks I had the ac regassed about a month ago because it wasn't cold at all. I was told that was all it needed, but they obviously didn't check the operation of the fan when they regassed it. I think I might wire the fan to come on with the compressor. Thanks for your help > Sounds like yoru low on gas and the low revs arent enough to get the gas > thats in there working. Had similar issue that was rectified with my toyota. [quoted text clipped - 15 lines] > > > > thanks > Sounds like yoru low on gas and the low revs arent enough to get the gas > thats in there working. Had similar issue that was rectified with my toyota. > A little R22 extra and away I went ICE COLD! With R290 (Propane) at least, I notice that when it starts to run low there is quite a loud hissing noise from the evaporator when the compressor is running due to the bubbles in it. >> Sounds like yoru low on gas and the low revs arent enough to get the gas >> thats in there working. Had similar issue that was rectified with my toyota. [quoted text clipped - 3 lines] > there is quite a loud hissing noise from the evaporator when the > compressor is running due to the bubbles in it. Is there some bituminous gunk wrapped around the expansion valve - if it's in with the evaporator, that is? If not, next time it's all in bits......  SignatureToby quidquid latine dictum sit, altum viditur > Is there some bituminous gunk wrapped around the expansion valve - if > it's in with the evaporator, that is? Nup. > If not, next time it's all in bits...... I've had one all in bits just a few hours ago that is now working fine. I'll post another thread about it with a somewhat fuzzy picture. I suck at taking photos especially as my right hand is currently stuffed, and shakes a bit now too. |
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