A/C not working
#1
A/C not working
The A/C has suddenly stopped working on my 2009 X150. All A/C controls on the Control panel work as normal but there is no air coming from the A/C vents.
Tried resetting system by disconnecting neutral from battery in case control module had hung up but made no difference.
Checked fuse F34 in rear seat fuse box (40A Blower Motor) fuse OK.
Checked fuse F6 in passenger footwell (A/C control) fuse OK
Front seat cooling is working OK and noticed a slight blip in revs when A/C is switched off and back on as if compressor is kicking in.
A/C system had new condenser fitted by Jag dealer just less than 2 years ago as A/C wasn't cooling, A/C was working fine but water coming in through passenger footwell under acceleration returned to dealer who checked system and said couldn't find problem but water occasionally came in as if drain hose wasn't connected properly or blocked.
Just read some problems with water ingress due to blocked drain can knacker A/C module due to shorting, so wondering if this is the problem.
Also noticed a slight whistling sound coming from vents when A/C fan on low during the past few months so now thinking if the A/C fan was on it's way out.
Just wondering if any other X150 owners have had any similar problems with A/C fan not blowing but controls still working on control panel and what was the eventual cure
Any feedback would be appreciated
Tried resetting system by disconnecting neutral from battery in case control module had hung up but made no difference.
Checked fuse F34 in rear seat fuse box (40A Blower Motor) fuse OK.
Checked fuse F6 in passenger footwell (A/C control) fuse OK
Front seat cooling is working OK and noticed a slight blip in revs when A/C is switched off and back on as if compressor is kicking in.
A/C system had new condenser fitted by Jag dealer just less than 2 years ago as A/C wasn't cooling, A/C was working fine but water coming in through passenger footwell under acceleration returned to dealer who checked system and said couldn't find problem but water occasionally came in as if drain hose wasn't connected properly or blocked.
Just read some problems with water ingress due to blocked drain can knacker A/C module due to shorting, so wondering if this is the problem.
Also noticed a slight whistling sound coming from vents when A/C fan on low during the past few months so now thinking if the A/C fan was on it's way out.
Just wondering if any other X150 owners have had any similar problems with A/C fan not blowing but controls still working on control panel and what was the eventual cure
Any feedback would be appreciated
#2
#3
#4
No air flowing, managed to get access to blower motor and checked voltage to motor on the 2 pin socket which connects to motor, shows 10V when ignition on so will remove motor tomorrow to see if it is jammed, also just read that it could be the motor resistor module that can go faulty, will post up results tomorrow
#5
#6
#7
If the condensate water is not flowing out of the A/C drain it will back up and short out the resistor and cause the blower motor to freeze up. The root cause is the duck bill drain being stuck closed. The most common fix is to cut off the end of the duck bill to allow the water to get out and by cutting off the end, the problem will not recur. Unfortunately on our cars (XKR) to get to the duck bill you have to lower the back of the transmission so you can reach the duck bill to cut it off. JLR will be happy to do it for you by pulling out the dash board and going in from the top for $1200 to $1300.
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#8
Managed to get the blower motor out and the fan was hard to turn, sprayed some lubricant and it now turns easily.
Whilst it was out applied 12V to fan motor and it runs fine, so fan motor OK.
Temporarily connected up fan and when ignition switched on fan gives a little kick then stops, adjusting A/C control on control panel has no effect.
When I checked voltage going to motor on the motor connections it is a steady 10V, udjusting the fan control speed knob makes no difference to the voltage, I would have thought this should vary depending on fan speed selected, looks like it could be the resistor block.
Have read that the fuseable link can blow, but if this has blown I'm assuming I would get no voltage at motor connections, so thinking it is more likely to be the thyristor that's gone in the resistor control block.
Is there any checks that you can do to confirm if the resistor block is faulty, before I buy a replacement or where the cheapest source is for buying them.
Whilst it was out applied 12V to fan motor and it runs fine, so fan motor OK.
Temporarily connected up fan and when ignition switched on fan gives a little kick then stops, adjusting A/C control on control panel has no effect.
When I checked voltage going to motor on the motor connections it is a steady 10V, udjusting the fan control speed knob makes no difference to the voltage, I would have thought this should vary depending on fan speed selected, looks like it could be the resistor block.
Have read that the fuseable link can blow, but if this has blown I'm assuming I would get no voltage at motor connections, so thinking it is more likely to be the thyristor that's gone in the resistor control block.
Is there any checks that you can do to confirm if the resistor block is faulty, before I buy a replacement or where the cheapest source is for buying them.
#9
The old school resister block was changed to a big transistor which may need the fans load to work correctly. With the fan hooked up, back pin the connections and see if the voltage is increasing with the fan speed. If not, replace the block. I'm going with fan getting tight caused the amp load to increase until it took the transistor out. I'd look into replacing them both and at least the resister block first.
#10
#11
The old school resister block was changed to a big transistor which may need the fans load to work correctly. With the fan hooked up, back pin the connections and see if the voltage is increasing with the fan speed. If not, replace the block. I'm going with fan getting tight caused the amp load to increase until it took the transistor out. I'd look into replacing them both and at least the resister block first.
#12
#13
#14
Yahoo A/C fixed
Resistor block arrived today, fitted and blowers now working as normal.
Although it was listed as DISCOVERY 3/4 RANGE ROVER SPORT HEATER BLOWER FAN SPEED RESISTER 077800-0901 this was the same P/No. removed from my 2009 XKR and much cheaper than those listed for the Jag XKR.
Thanks to forum members I've fixed the A/C for less than £20, wouldn't like to think how much the Jag main dealer would have charged for a 30 min job.
Although it was listed as DISCOVERY 3/4 RANGE ROVER SPORT HEATER BLOWER FAN SPEED RESISTER 077800-0901 this was the same P/No. removed from my 2009 XKR and much cheaper than those listed for the Jag XKR.
Thanks to forum members I've fixed the A/C for less than £20, wouldn't like to think how much the Jag main dealer would have charged for a 30 min job.
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#15
#16
#17
This may sound stupid but has anyone tried to drill a hole in an accessible part of the drain hose and araldite a threaded port in to hose so you could either stick a high pressure air line or pressure water jet down the hose every so often to keep the duck bill open or is this not feasible
#18
I don't think there are any accessible parts of the hose. On the 4.2 xk you can sort of reach it but not on the blower cars. I kind of sort of know where it is because I got dripped on while under the car. Mid way back beside the trans above the shielding. I could probably get to it with a coat hanger but winning the lottery is more likely. Luckily mine pours out water when the passenger side is higher than the drivers.
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