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Old 07-18-2007, 12:41 PM   #1
DanB98TJ
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1997 SW1
Mad Flashing coolant temp/trans temp/low coolant lights

Within a block of leaving work yesterday, the engine coolant temp/trans fluid temp/low coolant lights started flashing. I stopped and checked the fluid level and it was fine. Temperature gauge was less than 1/2 way, and since I had only driven a block there is no way the trans fluid was too hot.

After doing a search this morning, I pulled the reservoir and cleaned it out. I also replaced the ECTS and trans temp sensors. All the connectors and wiring look fine. The lights are still flashing.....

In an attempt to try to rule out the coolant level sensor in the reservoir, I made a jumper...lights are still flashing.

Now what?????

...
1997 Saturn SW1, auto trans, 121k miles

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Old 07-18-2007, 01:20 PM   #2
Zvolen
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Default Re: Flashing coolant temp/trans temp/low coolant lights

It may be simple, but did you reset the light?

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Old 07-18-2007, 01:34 PM   #3
DanB98TJ
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Default Re: Flashing coolant temp/trans temp/low coolant lights

How do you reset the light? Disconnect the battery?

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Old 07-18-2007, 01:46 PM   #4
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Default Re: Flashing coolant temp/trans temp/low coolant lights

There's no reset for that light. Flashing when the coolant is okay means there's a problem with the sensor in the reservior. I'm not sure why your jumper isn't working but, that is where the problem lies.

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Old 07-18-2007, 01:55 PM   #5
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Default Re: Flashing coolant temp/trans temp/low coolant lights

Thanks - I'll redo the jumper just in case it's not making good contact. If that doesn't work I guess I'll just keep driving it....

...
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Old 07-18-2007, 02:11 PM   #6
DanB98TJ
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Default Re: Flashing coolant temp/trans temp/low coolant lights

Well, the jumper was making good contact, so I did what I should have done first: checked the backup light fuse. It was blown. Replaced the trans and ECTS sensors, wasted nearly three hours, all for a ten-cent part.

If your coolant/trans/low coolant light starts to blink, do two things first: check the coolant level, and check the $#%& backup light fuse.

...
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