EM TuningJMB Retrofits
Results 1 to 7 of 7
  1. #1
    steviet's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Sep 2008
    Location
    ESSEX
    Posts
    432

    Overheating,fans not coming on etc

    Hi,i had a vag com check and it came up about the coolant temp sensor.so bought a new one and fitted it but it didnt work.The temp gauge didnt move!.So thought it was the thermostat,so after fitting the new thermostat tonight,but when runing the car the gauge still didnt move,so put the old one back in and now the temp gauge works but gets to 85 and doesnt get hotter and then over heats and the fans dont come on!. Could this be down to the temp coolant sensor or just an air block??.....
    Last edited by steviet; 17th February 2010 at 18:56.

    A3 1.8 TURBO| RS6 18INCH ALLOYS | FORGE 007 | SMOOTHED O/E BOX WITH COLD AIR FEED | COILOVERS | MOTECH RE-MAP | FULL CREAM LEATHER | FORGE DV RELOCATION | FORGE TIP HOSE|SILICONE BOOST HOSES|REMOVED REAR WIPER|G60 FLYWHEEL & VR6 CLUCTH|MILTEK CAT BACK DISCREET SYSTEM|312MM BRAKE UPGRADE|UPRATED DOG BONE MOUNT.

  2. # ADS
    ADS
    Join Date
    Always
    Location
    Global
    Posts
    Many
     
  3. #2
    leshkin's Avatar
    Speeding in reverse gear

    Status
    Offline
    Join Date
    Sep 2006
    Location
    Northwood
    Posts
    678
    Check the 30amp fuses on top of the battery - there should be three of these in a small plastic compartment. I had the exact same problem with my old A3 and it was this fuse. For safety they are located close to the battery in order to protect the wiring in the rest of the car.

    There are other possible causes of this, but if your temp gauge is working, it's probably not the temp sender that's buggered.

  4. #3
    6th Gear

    Status
    Online
    Join Date
    Jul 2007
    Location
    London
    Posts
    3,213
    How did you bleed the system ? Looks to me that there is an airlock and the thermostat wont open due to the water boiling...as it cannot be pumped by the water pump round the engine.
    FOR SALE:
    -Golf mk 5/audi a3 1.6 FSI fuel pump, brand new genuine part boxed + seals
    -audi a3 (1998 to 2003) genuine clutch slave cylinder to fit 1.6 engines BRAND NEW
    -Rear bush press tool to fit new rear axle bushes on Golf Mk3/4, Audi a3/S3, Seat Leon/Toledo, Skoda Octavia mk 1/2 used once

  5. #4
    steviet's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Sep 2008
    Location
    ESSEX
    Posts
    432
    Ive just had another go mate and topped up the res tank and kept squeezing the water pipes to pump the air out.The top hose got very hot and lower hose was hot to after a while.The temp got to 85c and has just stuck there for ages!,i took it for a quick drive down the road and it still sits at 85c when i got back.The fans have not cut in and it hasnt over heated??..it seems to drive ok etc perhaps i just need it to run for longer??..

    oh am'i right that when driving the temp should sit at 80-85c???..

    A3 1.8 TURBO| RS6 18INCH ALLOYS | FORGE 007 | SMOOTHED O/E BOX WITH COLD AIR FEED | COILOVERS | MOTECH RE-MAP | FULL CREAM LEATHER | FORGE DV RELOCATION | FORGE TIP HOSE|SILICONE BOOST HOSES|REMOVED REAR WIPER|G60 FLYWHEEL & VR6 CLUCTH|MILTEK CAT BACK DISCREET SYSTEM|312MM BRAKE UPGRADE|UPRATED DOG BONE MOUNT.

  6. #5
    Broken Byzan's Avatar
    Photographic Moderator

    Status
    Offline
    Join Date
    Apr 2004
    Location
    Cardiff, United Kingdom
    Posts
    12,505

    My Social Networking

    Follow Broken Byzan On Twitter Add Broken Byzan on Facebook Add Broken Byzan on Google+ Visit Broken Byzan's Youtube Channel
    Driving temp should be 90 degrees once warm. It does sound like you have bled the system correctly now. The fan sensor is on the side of the rad iirc, it would be worth pulling the plug and bridging the circuit to see if the fan will power up manually. If it does, it's the sensor, if not, more likely the fan or relay

  7. #6
    steviet's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Sep 2008
    Location
    ESSEX
    Posts
    432
    Yeah ill give that ago tomorrow mate,think im just going to get a new temp sensor just for piece of mind.Im sure the fans do work as i never had over heating probelms before this.

    A3 1.8 TURBO| RS6 18INCH ALLOYS | FORGE 007 | SMOOTHED O/E BOX WITH COLD AIR FEED | COILOVERS | MOTECH RE-MAP | FULL CREAM LEATHER | FORGE DV RELOCATION | FORGE TIP HOSE|SILICONE BOOST HOSES|REMOVED REAR WIPER|G60 FLYWHEEL & VR6 CLUCTH|MILTEK CAT BACK DISCREET SYSTEM|312MM BRAKE UPGRADE|UPRATED DOG BONE MOUNT.

  8. #7
    Reverse Gear

    Status
    Offline
    Join Date
    Sep 2009
    Location
    South London & Swansea
    Posts
    12
    I had exactly the same problem. Temp gauge was working fine, the heater was working fine. Saw the temp starting to rise on the gauge, stopped checked coolant level, which was fine, had a look to see if i could see any leaks from any pipes, nothing. Checked the 30amp fuse on top of the battery as suggested by Leshkin and could see that the fan fuse had partially melted and slightly warped. Pulled it out try to clean as best I could the connection and plugged a new 30 amp fuse in and haven't had a problem since. Monitored the temp gauge whilst sitting idle on the drive for about 20mins and could hear the fans kicking in as they should do.

    Thanks chaps

 

 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO

Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Content Relevant URLs by vBSEO