It was 32 this am and soon as I started the engine, the fan comes on a few secs later. Idle of course goes up when the radiator fan comes on. Drove it to work and it did it again during a stop. Has been like this for 6 months or so. Replaced both temperature sensors. The one to the right of cylinder 1 and the one in front of the engine. I don't have defrost on.
Fans randomly comes on
- Thread starter narongc73
- Start date
oilhammer
Certified Volkswagen Nut & Vendor
OBD works, start there. Don't throw any more parts at it.
If no DTCs can be found to steer you in the right direction (I would be asking both the Engine and the Climate modules), then I would go after looking at what data could cause a fan command. Which on a BRM should just be coolant temp or refrigerant pressure, both of which can be monitored via a scan tool.
If no DTCs can be found to steer you in the right direction (I would be asking both the Engine and the Climate modules), then I would go after looking at what data could cause a fan command. Which on a BRM should just be coolant temp or refrigerant pressure, both of which can be monitored via a scan tool.
Mozambiquer
Vendor , w/Business number
- Joined
- Mar 21, 2015
- Location
- Versailles Missouri
- TDI
- 2004 VW Touareg V10 TDI, 2012 Audi Q7 V6 TDI, 1998 VW Jetta TDI. 1982 VW Rabbit pickup, 2001 VW Jetta TDI, 2005 VW Passat wagon TDI X3, 2001 VW golf TDI, 1980 VW rabbit pickup,
Best advice you'll find on a forum! [emoji23]
Any Joe Blow can change parts, but the fact of the matter is, they can also diagnose.
Sent from my S60 using Tapatalk
relumalutan
Veteran Member
Do what Brian said, though you might not find anything with VCDS. You probably have a bad ground. The engine raises the RPM so the alternator can keep up charging the battery, that's why the fans are also coming in. It happened to me a while ago, I cleaned the grounds and all it's good now.
oilhammer
Certified Volkswagen Nut & Vendor
Good point, checking ground points is always something worth doing.
I have checked it so many times it's not funny. It's clean as a whistle.
lrb
Member
Have the same problem on my 2008 golf 1.9tdi.
I did, however, start throwing parts at ot. 2 coolant temp sensors, fan and yesterday an air con pressure switch. Since renewing the air con pressure switch the fans dont come on as frequently so im pressuming its got something to do with air con. Im cheching earths this weekend.
I did, however, start throwing parts at ot. 2 coolant temp sensors, fan and yesterday an air con pressure switch. Since renewing the air con pressure switch the fans dont come on as frequently so im pressuming its got something to do with air con. Im cheching earths this weekend.
Well I relocated the battery back to the engine bay from the trunk and it looks like it’s resolved. No more high idle and no starting issues. I can’t believe an 0/2 wire has issues. Too many intermittent issues. Now I have to relocated the Webasto.
Last edited:
Lesson learned, never relocate the battery on a diesel powered car. I always thought the weird issues I had with the radio, starting, and high idle was due to the battery being relocated. All of the issues didn't show up right away. I even ran negative all the way to the starter and still same issues. I should've put the Webasto where it belonged from the start, behind the drivers side front bumper. What a relief. Now my engine will probably go kaput because I ran it without oil for a minute.
DivineChaos
Top Post Dawg
a minute isnt anything huge. not good. but the parts weren't dry. some people have run them out of oil before. only time will tell.
DivineChaos
Top Post Dawg
a minute isnt anything huge. not good. but the parts weren't dry. some people have run them out of oil before. only time will tell.
I could tell there was a sound difference, light scraping sound. Oh well it's a BRM, maybe now the cams will wear to the point that I need to replace it. at 280k, no need for a cam yet.