Air con regassed & 3 speed fan brushes replaced, but...

Billy1mate · 22nd May 2012, 22:00

Right, if anyone fancies a bit of a challenge or head scratch, I need some assistance (spent all evening searching threads & I'm at a loss now.)
I have had the brushes replaced on my 3 speed fan & it has been run on the bench all working. I have replaced the air con condenser (thanks Jules) & had the system leak checked & regassed today.
Problem is switch 'demist' on & the fan does not run. The garage that regassed it said the air con was all good but they had to bypass the relays to get the air con to run up, how I'm unsure though. One thing the garage did say was that the engine bay relays (2 of them) got very hot.
Any hints, tips, direction or a thread will be appreciated.

mark d3 · 22nd May 2012, 22:15

stocktake or Arctic will probably be able to advise on your issues

Arctic · 23rd May 2012, 01:51

possibly a relay or the PCB board is not working was all the bushes soldered in properly how was it bench tested please advise Arctic.

SD1too · 23rd May 2012, 07:02

Quote:

Originally Posted by Billy1mate

... had to bypass the relays to get the air con to run up, how I'm unsure though.

This doesn't make much sense. Which relays? Can you ask your garage to point them out to you and report back.

Simon.

Billy1mate · 24th May 2012, 18:08

The relays getting hot; 1 is the internal blower (R5) & the other is engine relay (R4) both yellow, bottom left & right. I have swapped their locations & the same location makes that relay hot.

haydenukhayden · 24th May 2012, 18:18

Relay getting very hot normally means very high current flowing trough them have you got any restrictions in the system? (b4 blower) ie has to work harder or maybe theres a small short circuit? It's a stab in the dark

Lol it's funny the sun comes out for a day and theres about 4 new threads about aircons including mine lol

stocktake · 24th May 2012, 19:47

first Q:

When driving 30mph+ and the A/C is set to low ( not Econ) does the aircon work? IE is it blowing Icy cold through the vents?

if so we can safely say the A/C system is sound and the problem is indeed with the fan/relays/etc

T-Cut · 24th May 2012, 20:40

The fan relays are in the fan control box, not the engine bay fuse box. You need the bumper off to check the fan relays. The engine bay relays are another issue.

TC

Arctic · 24th May 2012, 21:45

Quote:

Originally Posted by T-Cut

The fan relays are in the fan control box, not the engine bay fuse box. You need the bumper off to check the fan relays. The engine bay relays are another issue.

TC

No other way thats why when i changed my fan i moved the control box into the engine bay.

Billy1mate · 25th May 2012, 16:45

Quote:

Originally Posted by stocktake

first Q:

When driving 30mph+ and the A/C is set to low ( not Econ) does the aircon work? IE is it blowing Icy cold through the vents?

if so we can safely say the A/C system is sound and the problem is indeed with the fan/relays/etc

No, it blows toasty warm/hot, probably the same as the OAT. The garage did the dye, pressure test, charge, oil etc...it was ice cold, but they bypassed the air con relay to get it to fire up, as far as I know the fan ran up too.
Regards the 4 wire fan, it ran up on the bench post brush replacement.

22nd May 2012, 22:00	#1
Billy1mate Posted a thing or two 120d M Sport Join Date: Feb 2012 Location: Sunny Weymouth Posts: 1,815 Thanks: 153 Thanked 142 Times in 121 Posts	Air con regassed & 3 speed fan brushes replaced, but... Right, if anyone fancies a bit of a challenge or head scratch, I need some assistance (spent all evening searching threads & I'm at a loss now.) I have had the brushes replaced on my 3 speed fan & it has been run on the bench all working. I have replaced the air con condenser (thanks Jules) & had the system leak checked & regassed today. Problem is switch 'demist' on & the fan does not run. The garage that regassed it said the air con was all good but they had to bypass the relays to get the air con to run up, how I'm unsure though. One thing the garage did say was that the engine bay relays (2 of them) got very hot. Any hints, tips, direction or a thread will be appreciated.

22nd May 2012, 22:15	#2
mark d3 This is my second home rover 75 saloon,cdt 170 bhp(ish) Join Date: Dec 2008 Location: maesteg Posts: 3,150 Thanks: 6 Thanked 7 Times in 5 Posts	stocktake or Arctic will probably be able to advise on your issues __________________ [SIGPIC][/SIGPIC][B meets and events in wales one event everyone should experience http://www.wolverhamptonnanomeets.com/

23rd May 2012, 01:51	#3
Arctic Give to Learn Freelander 2 Join Date: Aug 2010 Location: West Midlands Posts: 18,717 Thanks: 1,155 Thanked 6,407 Times in 3,874 Posts	possibly a relay or the PCB board is not working was all the bushes soldered in properly how was it bench tested please advise Arctic. __________________ Arctic Givology Learn to Give Everything is Achievable ad altiora tendo. Check out our Nano meet dates http://www.midlandsnanomeets.co.uk/ http://www.the75andztclub.co.uk/index.php?thepage=howto " You do the work , we supply the expertise "

24th May 2012, 19:47	#7
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,591 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	first Q: When driving 30mph+ and the A/C is set to low ( not Econ) does the aircon work? IE is it blowing Icy cold through the vents? if so we can safely say the A/C system is sound and the problem is indeed with the fan/relays/etc __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident

24th May 2012, 18:08	#5
Billy1mate Posted a thing or two 120d M Sport Join Date: Feb 2012 Location: Sunny Weymouth Posts: 1,815 Thanks: 153 Thanked 142 Times in 121 Posts	The relays getting hot; 1 is the internal blower (R5) & the other is engine relay (R4) both yellow, bottom left & right. I have swapped their locations & the same location makes that relay hot.

24th May 2012, 18:18	#6
haydenukhayden Regular poster MG ZT CDTI (131) Join Date: Mar 2012 Location: yeovil Posts: 46 Thanks: 0 Thanked 0 Times in 0 Posts	Relay getting very hot normally means very high current flowing trough them have you got any restrictions in the system? (b4 blower) ie has to work harder or maybe theres a small short circuit? It's a stab in the dark Lol it's funny the sun comes out for a day and theres about 4 new threads about aircons including mine lol

24th May 2012, 20:40	#8
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	The fan relays are in the fan control box, not the engine bay fuse box. You need the bumper off to check the fan relays. The engine bay relays are another issue. TC