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Old 15-07-15, 06:10 PM   #1
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Default Error code P0599.

Hi folks,

I've posted a few times recently concerning a problem I'm having with erratic air con performance in my 207cc 1.6 vti GT. Started off not working at all. Had a condenser leak identified and new condenser fitted. Started working but erratic...generally starting fine when car cold but cutting off when car warmed up...after about 5-10 minutes. As of Monday the aircon gave up the ghost and never worked at all. I had no luck trying to get a diagnostic done by somebody local on here so this morning I took it to a local auto electrician who specialises in air con. At the time I dropped the car off the aircon had refused to work since Monday morning (48 hours ago) Two hour later he phoned me to say the aircon was working. They had connected a diagnostic (not planet I don't think) and there were no faults coded on the Air con but one on the thermostat, P0599, 'Controlled Thermostat Controlled short circuit to positive permanent'. They had cleared this fault code and the aircon worked.

I went to pick the car up and lo and behold it WAS working. Paid them their bill and left for home (it was 54) halfway home (5 minutes) the aircon cut out. I got home and phoned them asking for the error code which they gave me but also asked me to come back so they could diagnose again. The error code P0599 had reappeared. They cleared this again and hey presto the aircon started working....until I was halfway home! I'm not critcising them at all because all I paid them for was a diagnostic not a repair.

I was just wondering if anybody had any idea how this thermostat error can effect the aircon? I am assuming it is not the thermostat itself but a sensor so does anybody have any previous experience of such a problem or of changing the thermostat or sensors?

By the way there is no evidence AT ALL of overheating or any other problem. Aside from this problem the car runs great but I just have to admit that while I considered myself a pretty decent DIY car mechanic in 1975, in 2015 I haven't a f****** clue!

Thanks.
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Old 15-07-15, 09:59 PM   #2
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Found this answer on Honest John site. It fits in with the aircon working after the code was cleared then stopping after 5 minutes driving when the code reappeared.

Quote:
Peugeot 207 1.6 VTI 120 (EP6) - Thermostat Housing and Air Conditioning - elekie&a/c doctor

Most modern cars use the engine coolant temp sensor to provide info for the engine control unit and others,including the a/c climate control system.If a fault is detected or the coolant temp becomes excessive,then the a/c system can be shut down to reduce any load on the engine.I would check the connections to the coolant temp sensor on the engine and also check to see if the sensor has a slight leak through the connector pins.It is not unknown on these for coolant to rise up into to wiring and eventually find its way into the engine control unit.(capilliary action).hth
Peugeot 207 1.6 VTI 120 (EP6) - Thermostat Housing and Air Conditioning | Technical matters | Back Room Forum | Honest John
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Old 16-07-15, 08:15 AM   #3
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That was really helpful and it really is appreciated. There is no sign of actual overheating as far as I can see and the temp sits at 92 all day while driving. The fan cuts in every time and on time if left idling. Therefore I suspect it must be a faulty sensor....or a wet one which sounds more pricey!

Thanks again. I'll get this checked out.
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Old 16-07-15, 10:32 PM   #4
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Had a very interesting day today. I took the car to my local dealer (Booths of Ditton) to price the job of a full diagnostic on the thermostat and the cost of changing the Thermo body if it was necessary as I don't feel competent enough to do it myself. They can do it for a little under 200 which is fair for me although I wish I had the confidence to do it myself as I can buy one on eBay for 53! Talking to the service guy who will be doing it he asked how long I'd been having problems with the aircon so I gave him the full story including the fitting of the new condenser by National Aircon. I also mentioned I was a bit concerned about the possibility of coolant getting to the ECU so he went out and checked all that for me and there was no leak or corrosion. He then took a look at the new condenser through the grill, called me over and said I'd better get in touch with National Aircon as the job was a disaster. He pointed out the pipe where it fits into the condenser and told me it should be flush with the condenser. Instead it was sitting up at an angle. It was touching the condenser at the bolted end but there was a gap of about eighth of an inch at the other end with some green material sticking out. The green material is apparently what's left of the O ring seal.

He then advised me to have a full diagnostic on the aircon itself there and then and, in fact, he would check out the thermostat as well. There is a permanent fault on the latter and I am having the body changed but it was the result of the aircon diag that was shocking. Instead of 6.5 Bar the pressure was 10.5 Bar, 50% higher than it should be and that at first he had thought the pipe to the condenser had been fitted wrong but that possibly it had been fitted ok but by putting too much gas in the system the O ring had been blown out. Additionally, he said, the sensor on the thermo might not be the only reason the air con is cutting out or refusing to work at all as there is also provision for the compressor to shut down if the pressure is too high. By the way, the dealer, who I have been buying cars off for years didn't charge me for any of this!

They are also sorting out the condenser for an extra 80 which I intend to reclaim from National Aircon. I did phone the National Aircon fitter when I got home and the response I got was to say the least not very helpful. It was basically that 'the aircon was working when I left your driveway so ....! He then said I could take him to court (which I may do at some point but I'll try trading standards first) I'll take that as far as I have to. I'm not slagging off National Aircon, I'm sure there are thoudsands out there who have had a very good service from them, but it seems I didn't on this occasion! Hopefully it will all be sorted when the car goes in next week. Then I might sell it and buy a bike.
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Old 16-07-15, 10:37 PM   #5
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My maths is terrible! It's not 50% more pressure than it should be its 66% isn't it?
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