Dupont Posted October 13, 2017 Share Posted October 13, 2017 I have a 2007 Mondeo 2.0 diesel TDCi. The air con stopped blowing so I had it recharged. Halfrauds said no leaks detected but that the system still hadn't kicked on. So, I have a fully gassed system that isn't working. Any ideas? Quote Link to comment Share on other sites More sharing options...
Praada Posted October 13, 2017 Share Posted October 13, 2017 I was under the belief that Halfrauds didn't have the right kit to diagnose the fault? They will re-gas but they couldn't detect a leak last time i went, admittedly a couple years ago now... Quote Link to comment Share on other sites More sharing options...
Dupont Posted October 13, 2017 Author Share Posted October 13, 2017 They used a dye apparently and said no leaks. Also I still had some gas in system and usually with a leak there is none or very little. Quote Link to comment Share on other sites More sharing options...
Praada Posted October 13, 2017 Share Posted October 13, 2017 Yes but the gas is actually a lubricant and if stood for some time, it leaks past the seals :( I think its a UV dye they use though so must be right unless the person testing it was blind haha! Hopefully its something simple as it isn't cheap to replace the compressor/condenser unit. Quote Link to comment Share on other sites More sharing options...
iantt Posted October 13, 2017 Share Posted October 13, 2017 wiring fault probably. needs a proper garage who know what there doing to diagnose it correctly. Quote Link to comment Share on other sites More sharing options...
isetta Posted October 13, 2017 Share Posted October 13, 2017 "The air con stopped blowing " , do you mean the fan blows but the air is not cold, or the fan does not blow at all Quote Link to comment Share on other sites More sharing options...
Dupont Posted October 13, 2017 Author Share Posted October 13, 2017 The fan definitely blows. Just not refrigeration air even after top up. No leaks detected on system. Quote Link to comment Share on other sites More sharing options...
al2052 Posted October 13, 2017 Share Posted October 13, 2017 The engine fan should run before the a/c will start, a common fault is a break in the control wire to the fan, to check this after doing a run leave the engine idling when stationary to increase temp, if fan cuts in then this feed is ok, if not then possible break in wire to module. 1 1 Quote Link to comment Share on other sites More sharing options...
iantt Posted October 14, 2017 Share Posted October 14, 2017 if the fan does kick in due to hot engine, next check is to check the fan kicks in when switching air con on, if it does, check the compressor is engaging at around the same time. should be able to hear it it click when engaging. possibly see it also if you have a look. fan working but no compressor will narrow down to compressor circuit no fan or compresser and then it can be all sorts of reasons from pressure switch, evap sensor, control module, wiring. 1 Quote Link to comment Share on other sites More sharing options...
Dupont Posted October 14, 2017 Author Share Posted October 14, 2017 I just ran a diagnostic AC check from a YouTube video. Press Off and Footwell button together then Auto on climate control panel and it starts up. Not getting any error codes, but got these numbers at the finish of it. 77 FO 6F 04 00 I can't hear compressor come on or engine change tone when AC is switched on. Quote Link to comment Share on other sites More sharing options...
iantt Posted October 14, 2017 Share Posted October 14, 2017 but does the rad fan come on with engine running with air con switched on? Quote Link to comment Share on other sites More sharing options...
Dupont Posted October 14, 2017 Author Share Posted October 14, 2017 No just ran it for two hours nearly. Fan behind radiator never came on once. Quote Link to comment Share on other sites More sharing options...
Dupont Posted October 14, 2017 Author Share Posted October 14, 2017 14 hours ago, al2052 said: The engine fan should run before the a/c will start, a common fault is a break in the control wire to the fan, to check this after doing a run leave the engine idling when stationary to increase temp, if fan cuts in then this feed is ok, if not then possible break in wire to module. The fan behind radiator is not coming on at all. Quote Link to comment Share on other sites More sharing options...
iantt Posted October 14, 2017 Share Posted October 14, 2017 So the command to switch on the fan and compressor is not there. Quote Link to comment Share on other sites More sharing options...
iantt Posted October 14, 2017 Share Posted October 14, 2017 You will have to check the fan works with engine hot as per al2052 Have you had the car serviced recently? Why I ask is the pollen filter is located near the fuse box and wiring for Evaporator sensor. It's normal to drop down fusebox,unclip the connector to sensor to gain enough access to remove the filter. Maybe the sensor wiring has not been clipped back in properly. Quote Link to comment Share on other sites More sharing options...
iantt Posted October 14, 2017 Share Posted October 14, 2017 Anything other than that and you will need someone with knowledge of wiring/Aircon to diagnose for you. Quote Link to comment Share on other sites More sharing options...
Dupont Posted October 14, 2017 Author Share Posted October 14, 2017 The fan doesn't come on at all. Quote Link to comment Share on other sites More sharing options...
iantt Posted October 14, 2017 Share Posted October 14, 2017 But the engine has to be pretty hot before it kicks in ,(will take ages at this time of year.) Quote Link to comment Share on other sites More sharing options...
Dupont Posted October 14, 2017 Author Share Posted October 14, 2017 I sat it idling for 30 mins after a twenty mile run. No fan came on. Quote Link to comment Share on other sites More sharing options...
al2052 Posted October 14, 2017 Share Posted October 14, 2017 It would appear that you have break between the fan and the control manual, apparently it mostly happens adjacent to the gearbox but can be also be corroded conections, the control cable runs between the fan and the control module which seems to be under the nearside wheel arch, I cannot verify this as my engine fan came on after about 15 mins idling and consequently regass cured it, so didn't have to go that far. also bear in mind mine is petrol engine so may get hotter quicker than diesel. Quote Link to comment Share on other sites More sharing options...
Dupont Posted October 15, 2017 Author Share Posted October 15, 2017 I think the fan is definitely my issue as it simply doesn't come on. Is the control cable the one that connects to the top or the bottom of that square plastic switch type thing in front of fan? Quote Link to comment Share on other sites More sharing options...
al2052 Posted October 15, 2017 Share Posted October 15, 2017 Its the purple wire. Quote Link to comment Share on other sites More sharing options...
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