VR6Pete 1,455 Posted May 22, 2004 Report Share Posted May 22, 2004 Ok.... I was under the impression that 1 fan runs all the time when the engine starts? I've just had my air con re-charged and that's shown up a problem where as by one of the fans dont kick in, and when the car reaches above 90 degrees on my clocks both fans kick in and my air con compressor, what could cause this to happen? my air con used to always work (and 1 fan used to always run) from the moment i turned the key, but not both fans kick in at the same time (and air con compressor) after the engine has got hot) Any idea?Cheers Link to post Share on other sites
six appeal 53 Posted May 22, 2004 Report Share Posted May 22, 2004 Are you talikng about the rad fans or the fans in the car interior Pete? The radiator fans have one with a motor and the other is driven off it via a belt I believe, so they can only run together as far as I am aware. ( I may be wrong?) Link to post Share on other sites
VR6Pete 1,455 Posted May 22, 2004 Author Report Share Posted May 22, 2004 rad fan mate, if it's driven off a belt what could be causing my air con not to kick in until both the rad fans kicks in? Link to post Share on other sites
FishWick 21 Posted May 22, 2004 Report Share Posted May 22, 2004 Assuming we're talking about the two fans speeds and not the number of them (connected with a belt as Sixappeal says), speed one comes on at 90 or thereabouts (IIRC) and speed two comes on at 100, along with the secondary water pump. The fans should not be on when you start the car from cold, but then again, that is true of a non-air conned car, so I'm not too sure what air conned engines do to be honest. I know my mate's Rado VR6 with air-con doesn't have the fans on when started in the morning. Sorry, that's all I can offer as I don't have air-con. Hope it helps in some small way anyway! Link to post Share on other sites
speedo 0 Posted May 22, 2004 Report Share Posted May 22, 2004 Pete, I`ll ask at work for you. On the mk4 ,as soon as you put the a/c on, the a.c fan runs`s continuous regardless, but they have two seperate fans, rather than belt driven. I will ask on monday Link to post Share on other sites
dubloke 4 Posted May 23, 2004 Report Share Posted May 23, 2004 kev-when you say secondary water pump i'm presuming thats the auxiliary water pump, and i thought that it runs all the time, even when the engine isn't running? can you confirm this? also, does anyone know how much they are to replace as i think mine is on the way out as its started making odd noises since i changed my hoses? Link to post Share on other sites
andy 0 Posted May 23, 2004 Report Share Posted May 23, 2004 auxilliary water pumps run all the time the ignition is on, they also run when the engine is turned off in conjunction with the electric cooling fan if the temperature is still too hot to prevent overheating once the engine has stopped. They are about £70 from VW which from memory was at least £10 cheaper than German and Swedish Link to post Share on other sites
FishWick 21 Posted May 23, 2004 Report Share Posted May 23, 2004 Yeah thinking about it, you guys are right, it does run all the time. Heard mine buzzing this morning. First time I've noticed it! Link to post Share on other sites
VR6Pete 1,455 Posted May 24, 2004 Author Report Share Posted May 24, 2004 cheers speedo Link to post Share on other sites
VR6Pete 1,455 Posted May 27, 2004 Author Report Share Posted May 27, 2004 anyone else help me?shud ur rad fans kick in wen ur air con does from a cold start? Link to post Share on other sites
acf8181 0 Posted June 22, 2004 Report Share Posted June 22, 2004 ok, just reading up...so will be updating this post as sson as i learn somethin new.for starters, the vr6 has a three speed fan (two fans tho, linked as said already), the third speed is for when the engine has just been switched off...to control under bonnet temps.crikey...this is seriously complicated! i'm too tired to understand now, but pete, check you mail.[ Edited Tue Jun 22 2004, 09:21PM ] Link to post Share on other sites
VR6Pete 1,455 Posted June 23, 2004 Author Report Share Posted June 23, 2004 my problem could be the pressure switch on the air con thats causing this. I'll look into getting it replaced. Link to post Share on other sites
acf8181 0 Posted June 23, 2004 Report Share Posted June 23, 2004 i'm sure it said in the bentley pages i sent you that you could test the switch easily? Link to post Share on other sites
VR6Pete 1,455 Posted June 23, 2004 Author Report Share Posted June 23, 2004 yep it does, i'll test it instead lol Link to post Share on other sites
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