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coolant level surprise
by
Kneale Brownson
on 10 Nov, 2007 08:27
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I was getting the floating thermometer coolant level warning intermittently, so I added some mixed coolant to the reservoir, raising it from just above the "MIN" mark to just above the "MAX" line. Now that I've been using the heater some, I see the coolant level is almost a half inch above the "MAX" line.
I presume I had an air bubble or something because of not using the heater.
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#1
by
jtanguay
on 10 Nov, 2007 12:35
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isn't the heater fully connected in the loop? only mk1's have the shut off valve? just opening the coolant cap and running the motor can help bleed off some of the bubbles.
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#2
by
fatmobile
on 11 Nov, 2007 02:33
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What kind of car is it and are you getting a steady stream of coolant through the little line coming off the radiator?
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#3
by
Kneale Brownson
on 14 Nov, 2007 17:59
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It's a 1994 Jetta TD.
There is a steady stream of coolant into the reservoir from the little hose to near the top of the reservoir.
I haven't seen any change in the level since I noticed it was well above the mark. I still get an intermittent floating thermometer flash on the instrument cluster.
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#4
by
Doug
on 14 Nov, 2007 18:46
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The float level sensor sometimes gets crudded up to the point of faulty messages. It is cheap to replace or you could try cleaning it in some soapy water.
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#5
by
insdtanoodles
on 14 Nov, 2007 20:50
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good luck getting rid of that warning light, mine has been going off forever. I have cleaned the take out 3 times and bought a new one and it's still going off randomly so I just check every now and then to make sure I didn't actually start loosing coolant
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#6
by
fatmobile
on 15 Nov, 2007 02:32
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I wonder where that sensor is grounded.
Might be a corroded ground connection.
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#7
by
Kneale Brownson
on 15 Nov, 2007 14:07
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According to Bentley wiring diagrams, the ground for the sensor is in the engine compartment wiring harness. I suppose that means one of those "welded" connections where they pinch several grounds together with a crimped ferrule and then bury it in the harness.
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#8
by
fatmobile
on 17 Nov, 2007 02:12
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Check voltage on each side of the sensor,... pull the rubber plug cover back. Should be 0 volts on the ground side.
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#9
by
Kneale Brownson
on 18 Nov, 2007 21:32
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Or I could look for continuity to a ground source?
So after I determine which is ground, maybe I should run a good, new clean ground to the chassis or the engine?