There is a diode for the compressor clutch in the engine compartment fuse box.

Scroll down to Generation II.

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Thank you for the link and I appreciate the help. The diode is good. I checked it some weeks ago.

 

On a hot day, I may start the car and leave it idling on the driveway for 5 approx minutes, with the air-con switched on the main cooling fan sometimes kicks in if needed, not because the engine is up to full temperature but it is called on to start by the air-con. The fan draws air when needed thro' the condenser and the radiator for engine cooling. I assume then that when you press the air-con button you do not hear a click, the engine revs drop slightly and the air-con kicks in, so is the air-con still gas up, I take it that the air-con pressure switch is OK, I assume the blower fan runs OK on all speeds as that also enables the air-con to run.

 

Thank you for the information. When you refer to the main cooling fan, does this mean there are two cooling fans as I only have one. I have an unused two pin fan connector (yellow) and cannot find anywhere to connect it to. I will confirm the points you have outlined tomorrow after work.

 

No sorry, there is only one fan which draws air thro' the condenser core and then thro' the radiator core.

 

Ok, Thanks. Thats one worry out of the way.

 

I did the checks and can confirm the following.

The interior fan blower works 1 to 4. When the aircon is switched on I can hear a pop and hissing from the compressor and can confirm the compressor relay is working. There is no drop in engine rpm and the condenser fan does not rotate and there is no voltage present.

I confusing issue I have is that the eircon engineer who refilled the gas told me not to run the aircon for more than 20 seconds with the condenser fan not working or serious (dangerous) situation would happen. This I cannot understand as I would assume the car has safety features to prevent this from happening, ie, the high pressure switch.

 

Wouldn't the lack of a drop in rpm suggest no extra load on the engine so either the clutch is not engaging properly or the compressor has nothing to compress? I've never heard a compressor pop and hiss just a mechanical click as the clutch engages.

 

Thanks again for your input. I will consider what you said and investigate further. I really need to find someone around me with a Stepway to do a comparison.

 

I once had a car where the clutch would stick. If you tapped it with a spanner it would engage and work for a day or so.

 

I know that trick with starting motors back in the day. I think the compressor relay should also feed the condenser fan. I have to figure out why the fan has no voltage to it. Cannot believe there is no proper electrical drawings for these cars.

 

It is a electromagnetic clutch. The pulley freewheels until the clutch engages. Do you actually have two fans?

 

No. I have one fan and an unused second fan connector hanging loose that may or may not important.

 

I think only the cars with climate control have the second fan. No UK cars and probably Eire cars have climate control. I think you are going down a blind alley with the fan. A fan only improves the performance. The compressor turns the gas to a warm liquid if that liquid is cooled it will work better but is not essential. Think fridges they do not have forced cooling.

I think you should take it to a different air con specialist.

 

Cheers. Thats what I am going to do. Perhaps the gas pressure is wrong. I did not get a print out. He told me the reason my aircon would not work was because the fan was not working. I found that hard to believe but did not have enough knowledge to contradict him.

 

The attached is for information only and comes from the Logan 2012 circuit diagrams, there are a number of variations due to vehicle spec, it also seems to cross match within reason with the German duster circuits on this forum.

Totally agree with Daedulus, engine running, blower on speed 1, 2, 3 or 4, push the air-con button, wait for the click as the clutch engages, engine revs drop slightly, air-con is now running. As previous the engine cooling fan doe's kick in on our Duster if it is stationary with the air-con running prior to the engine reaching full running temperature. Try another air-con expert.

<a>171 </a>AIR CONDITIONING CLUTCH

<a>474 </a>AIR CONDITIONING COMPRESSOR CONTROL RELAY

<a>597</a> ENGINE AND RELAY FUSE BOX

<a>120 I</a>NJECTION COMPUTER

<a>322</a> AIR CONDITIONING AND POWER ASSISTED STEERING LED

 

Again for information only, this is the air-con system for a Duster with climatic control, as Daedulus has commented two fans, but this doe's give one an idea of the layout of the parts, did not check thro' the info but alternative gases are used nowadays.

 

Thank you for the attached file. With the information received from both of you, I now have enough information to move forward and will let you know when I have it resolved, cause and solution. Really appreciate both of you taking time to assist me.

 

Thank you for the attached file. With the information received from both of you, I now have enough information to move forward and will let you know when I have it resolved, cause and solution. Really appreciate both of you taking time to assist me.

I have checked mine for you and can assure you that the fan always runs when you turn the air-con on and the is engine running even if it is not required because the engine is cold.

 

Roger, yep, shot myself in the foot there, one must always look as well as listen, I only listened, on our Stepway and the fan runs at low speed when the air-con switched on, same on our Duster, I assume then fan in each case are multi / variable speed, maybe I should not assume so often.

 

I have checked mine for you and can assure you that the fan always runs when you turn the air-con on and the is engine running even if it is not required because the engine is cold.

Thanks for that. My fan has never turned, but great help from here will change that hopefully soon.

 

I have tried again, the Logan electrical circuits I have are not a lot of use, but looking at them and the German Duster circuits on this forum may give me / us inspiration, as before for info only. So I guess that the cooling fan is two speed.

<a>120</a> INJECTION COMPUTER

<a>188 </a>COOLING FAN UNIT

<a>321</a> AIR CONDITIONING FAN ASSEMBLY RESISTOR

<a>336 </a>FAN SPEED 2 RELAY

<a>597 </a>ENGINE AND RELAY FUSE BOX

<a>700</a> PERCOLATION FAN LOW SPEED RELAY

<a>784</a> COMMAND RELAY BLOCK 2

<a>983</a> DIESEL INJECTION COMPUTER SUPPLY RELAY

PERCOLATION means "trickle through", so on this the fan is driven by two relays, 336 and 700, one at full speed and one at low speed, at low speed the fan is powered via a resister 321. So we have a case of the injection computer controls the relays, the relay(s) in turn power up the fan, using power supplied via the fuses.

It may worth checking in the fuse box again to see if any of this is any use or remotely similar.

 

I think the fan is a red herring. The aircon is just not being turned on for what ever reason. If aircon runs one pipe from the compressor should be warm ( to the condenser ) the other, the return from the evaporator should be cold.

 

Yep, quite true, need perhaps something like Renault Clip to diagnose what is happening, to read the ET and PR data from the UCH and Injection computers to allow one to find out where the system is stopping.

 

Can I please ask if anyone could confirm the issues shown in the attached picture. The glow plud relay is detached and I do not know where it fixes and the unused two pin connector is shown, it may be a spare plug but has no protective cover fitted and has spades exposed. Dissapointed that I missed so much when I purchased it.