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devesvws Samba Member
Joined: January 05, 2004 Posts: 1540 Location: madison va
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Posted: Tue Aug 12, 2014 1:43 pm Post subject: Blinking coolant light at start up, but not with low coolant |
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its a 1991... I had a hose come loose up front last week and thought the light should have come on but the reservoir was still full so I didn't think anything of it until I went to add the lost coolant and checked the level... its not working?? is there a relay that controls the light? location? relay number? I checked the wire and plug and the sensor is only a few yrs old so it must be a relay?? _________________ THE FEW THE PROUD THE ORIGINAL VW WATERBOXER -> looking for a original 91 vanagon owners manual with 1991 on the cover http://www.youtube.com/watch?v=pmuiG2tUsP4&feature=share https://picasaweb.google.com/101290228103300323836/BostonBobFlywheelVideo#5543000332201103922 |
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insyncro Banned
Joined: March 07, 2002 Posts: 15086 Location: New York
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Posted: Tue Aug 12, 2014 1:53 pm Post subject: |
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If there truly isn't air in the system, the dash pod foil can create issues that are shown as non responsive sensors. |
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Farf Samba Member
Joined: July 12, 2009 Posts: 463 Location: Colorado
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Posted: Tue Aug 12, 2014 1:56 pm Post subject: |
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I think the light blinks when you turn the ignition on as a test. There is a coolant low level relay located in position 3 on the fuse/relay box. Refer to Bentley Manual page 97.201...
I had the same issue and found that there wasn't a relay installed. It should be a #43 relay. |
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devesvws Samba Member
Joined: January 05, 2004 Posts: 1540 Location: madison va
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DLJ Samba Member
Joined: August 05, 2008 Posts: 554 Location: North California
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Posted: Tue Aug 12, 2014 2:16 pm Post subject: red light |
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There is also a small printed circuit on the inside of the guage. Changed mine and now it work properly. |
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devesvws Samba Member
Joined: January 05, 2004 Posts: 1540 Location: madison va
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atomatom Samba Member
Joined: May 15, 2012 Posts: 1867 Location: in an 84 Westy or Bowen Island, BC
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Posted: Tue Aug 12, 2014 3:02 pm Post subject: |
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before you go nuts and destroy your dash, check the wire to the coolant level sensor. very easy for that to become loose. if not connected, it will blink forever.
on starting, if you get a test blink for a few seconds, then it turns off, that is working perfectly. i was not clear on what is actually going on for you. _________________ 84 Vanagon Westy, 1.9L, California raised but defected to Canada. |
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morymob Samba Member
Joined: November 09, 2007 Posts: 4683 Location: east-tn
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Posted: Wed Aug 13, 2014 6:03 am Post subject: |
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Try a jumper in plug from top of tank, see if it works norm if not look at wiring cont. |
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devesvws Samba Member
Joined: January 05, 2004 Posts: 1540 Location: madison va
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Ahwahnee Samba Member
Joined: June 05, 2010 Posts: 9799 Location: Mt Lemmon, AZ
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Posted: Wed Aug 13, 2014 10:58 am Post subject: |
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devesvws wrote: |
...I did jump the plug with a jumper wire and still no light,.. |
I believe 'no light' when the plug is jumped is correct.
What happens when the plug is removed but not jumped? That should cause the light to blink. |
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PDXWesty Samba Member
Joined: April 11, 2006 Posts: 6244 Location: Portland OR
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Posted: Wed Aug 13, 2014 10:59 am Post subject: |
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Blinking on starting for 7 times then stopping is normal.
While the van is running, if you unplug the sensor wires, the light should start blinking. Jumping the wires would make it stop.
I'm pretty sure that's how it's supposed to work. _________________ 89 Westy 2.1 Auto |
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devesvws Samba Member
Joined: January 05, 2004 Posts: 1540 Location: madison va
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PDXWesty Samba Member
Joined: April 11, 2006 Posts: 6244 Location: Portland OR
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Posted: Wed Aug 13, 2014 11:26 am Post subject: |
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I'm confused...If it blinks on start up, then stops, everything is working properly. I don't see what you mean by saying it doesn't blink when the van is running. It's not supposed too.
If the sensor or wiring or dash cluster were bad, none of that would be happening.
The start up test indicates nothing wrong with the light or sensor.
Does it blink when you unplug the sensor? If not, there may be a short in the wiring. Connection all the time between the contacts would make it act like you describe. Use your multi meter to measure continuity between contacts when you pull the plug. _________________ 89 Westy 2.1 Auto |
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devesvws Samba Member
Joined: January 05, 2004 Posts: 1540 Location: madison va
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devesvws Samba Member
Joined: January 05, 2004 Posts: 1540 Location: madison va
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PDXWesty Samba Member
Joined: April 11, 2006 Posts: 6244 Location: Portland OR
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Posted: Wed Aug 13, 2014 11:36 am Post subject: |
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devesvws wrote: |
the coolant tank is empty right now, so it should be blinking until I fill it back up...yes??? |
Yes, it should blink.
There are two small probes on the end of the sensor. When coolant hits them, it closes a circuit and the light stops blinking. If it never blinks, the circuit is closed somewhere. You need to find where that is by process of elimination.
Have you tried unplugging the sensor leads yet? What happens? _________________ 89 Westy 2.1 Auto |
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devesvws Samba Member
Joined: January 05, 2004 Posts: 1540 Location: madison va
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MarkWard Samba Member
Joined: February 09, 2005 Posts: 17118 Location: Retired South Florida
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Posted: Wed Aug 13, 2014 1:11 pm Post subject: |
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On the 90 I have, I noticed that the key needed to by cycled to shutoff the flashing light after jumping the connector. Seems that once it started flashing it wanted to keep flashing until the key was cycled.
So, say you had a flashing light, and wanted to add coolant while the engine was still running the coolant light would continue to flash even after filling.
I am basing this only on the one Vanagon overflow tank warning I did work with. After all these years and owners it could just be unique to this one too.
I'd be more concerned about the gauge accuracy vs the coolant level. My 82 does not have a coolant level warning. But does have the LED to get your attention if it starts to overheat. _________________ ☮️ |
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PDXWesty Samba Member
Joined: April 11, 2006 Posts: 6244 Location: Portland OR
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Posted: Wed Aug 13, 2014 1:27 pm Post subject: |
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devesvws wrote: |
swapping out the cluster did not work so it must be a broken wire... |
No - A broken wire would cause it to always flash. A shorted connection would cause it to never flash, like you describe.
Again - have you pulled the connector while the van is running and did it start to flash?
That will tell you if the short is in the sensor or in the wiring. _________________ 89 Westy 2.1 Auto |
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devesvws Samba Member
Joined: January 05, 2004 Posts: 1540 Location: madison va
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Posted: Wed Aug 13, 2014 2:39 pm Post subject: |
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PDXWesty wrote: |
devesvws wrote: |
swapping out the cluster did not work so it must be a broken wire... |
yes I have pulled it and it did not flash, so it must be in the wire right? when I probe the end of the plug I get a ground on one side but not the other, if it was shorted or fused together, would I not get the same on the other end??
No - A broken wire would cause it to always flash. A shorted connection would cause it to never flash, like you describe.
Again - have you pulled the connector while the van is running and did it start to flash?
That will tell you if the short is in the sensor or in the wiring. |
_________________ THE FEW THE PROUD THE ORIGINAL VW WATERBOXER -> looking for a original 91 vanagon owners manual with 1991 on the cover http://www.youtube.com/watch?v=pmuiG2tUsP4&feature=share https://picasaweb.google.com/101290228103300323836/BostonBobFlywheelVideo#5543000332201103922 |
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