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03-11-2010, 11:11 PM
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Flashing Blue Coolant Light
This is weird. According to the owners manual, it means there is some error in the cooling system. Usually, a simple restart of the car solves this problem and it doesn't happen again for a week or so.
Well, i assumed that the change of my timing belt and waterpump would solve this, but it didn't. It just came back on today while i was on the highway. Also, i have that strange problem where about 15 minutes after the blue temp light goes off, it comes back on. I'm thinking its a sensor that wasn't included in the timing belt change.... My guess is the Coolant Temp Sensor, but i'm not sure on this one. I don't want to replace something that doesn't need replacing because my pockets are a little light from this temporary unemployment. Anyone know?
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03-11-2010, 11:23 PM
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Coolant temp sensor or coolant level sensor. Both are cheap.
__________________
2000 New Beetle GLS TDI 5 speed swap w/SBC Stg 3 clutch and Dieselgeek short shifter, RC3, PP520's, Eurojet SMIC, 3 bar map, Dieselgeek skidplate, 2" lift w/VR6 springs, 2.5" turbo-back straight pipe "weedburner" side exhaust, air horn, ABD Cup front bumper, HID retrofit, LED tails, Bernt Pod w/McNally gauges. WISH LIST: VNT 17/22 hybrid turbo, RC5 and other silly stuff.
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03-12-2010, 10:56 PM
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I have found that if the coolant temperature sensor is bad, you will see the flashing blue coolant light. If the coolant level is low in the reservoir, or the coolant level sensor is bad, you will see the flashing red coolant light.
I hope that helps. Dale
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03-19-2010, 07:54 PM
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My 2003 1.8T Beetle also has the cooling sensor faulty
Hi,
My 2003 1.8T Beetle also has the blue faulty cooling sensor. Only in mine I was also getting the low oil pressure alarm. At first I thought it was only oil related. Although it'd appear randomly, only when below 1500 RPM's. The dealer suggested that an engine flush may be needed. Doing additional t-shooting I have found that the low oil pressure alarm only appears whenever the coolant blue alarm is on. Hence, it's got to be electrical related. I want to replace the coolant sensor first and see if that also eliminates the low oil alarm. If it doesn't, then I may think that it will have to be something with the grounding maybe? I was wondering if anyone else has gone through something similar?
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03-21-2010, 11:26 PM
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03-30-2010, 01:04 AM
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don't count on it being somthing simple. read my post that i titled engine junked?
i was going down the road and my coolant light started flashing then oil pressure light. luckily i didn't drive far but i had coolant hose issues and leaking gasket area's in my engine. oil pressure light is an indicator of engine issues, not coolant.
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03-30-2010, 01:23 AM
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03-30-2010, 02:17 AM
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"There's a big difference between the coolant light flashing blue and flashing red"
uhhh yeah i agree. at no time did mine flash red. i also have a friend with a jetta with issues similar to mine.. all i'm saying is not to undermind it and assume it's a simple fix
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03-30-2010, 02:30 AM
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Quote:
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Charles, did you ever get your car fixed? What did it wind up being?
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03-30-2010, 07:22 PM
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it's ok to be confused. it comes with age.
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03-30-2010, 08:18 PM
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 Funny because Farris is only a tad older than me! Quote:
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03-30-2010, 09:34 PM
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10-16-2010, 06:05 AM
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Would you even try having some branded parts like the Centric Brand and the like in your car? It might have some connection with other parts that it goes to act up very well. Go try that one.
Last edited by armandjones82; 10-19-2010 at 01:40 AM..
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10-16-2010, 03:08 PM
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Never even heard of that brand. I'll stick to OEM or known VW brands.
__________________
The Baby: Darla, 102k, '99 New Beetle GL 5-speed. Bone stock. Acquired 4/6/05. Gave her life for me 8/17/11. RIP  The Project: Klaus, 180k+, '84 Jetta GL Turbo Diesel. Rebuilt and bringing 50+ mpg. Slightly improved from stock  Acquired 7/12/08The Baby Brother: Günther, 20th Anniversary Edition GTI 
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10-16-2010, 06:47 PM
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Quote:
Dealer or Autzone/Advance Auto Parts.
__________________
Got an Engine or Airbag light but can't afford a Vagcom or trip to the dealership?
Need help finding a local mechanic or shop? <<credit to Fl_Bug>> (o \__(vw)__/ o) (add me!)
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10-16-2010, 08:37 PM
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The CTS is VERY well known to cause a flashing blue temp light and has to be one of the quickest/cheapest fixes on these cars.
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Cheers Simon
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It was the coolant temp sensor.
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