Low Coolant - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-20-2003, 03:11 PM   #1
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Default Low Coolant

every time i start my car its fine but once i drive a few seconds the low coolant light comes on, but im not low on collant. i just had my rad flushed and i got them to but dexcool in but the light still comes on, is there a low coolant sensor that could be faulty if so does anybody know where this this is

any help would be awesome
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Old 05-20-2003, 03:35 PM   #2
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Some times it could be the mixture. more coolant than water can cause that. try draining some coolant out and adding more water. should do the trick. i experienced that with a 91 cavalier z24! give a try, if not, it should be a sensor.
GOOD LUCK!
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Old 05-20-2003, 05:23 PM   #3
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What is the year and trim line of your car?
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Old 05-20-2003, 05:24 PM   #4
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i got a 94 ssei
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Old 05-20-2003, 06:38 PM   #5
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Some times it could be the mixture. more coolant than water can cause that. try draining some coolant out and adding more water. should do the trick. i experienced that with a 91 cavalier z24! give a try, if not, it should be a sensor.
GOOD LUCK!
Al


I had the same problem with my 90 cav but that doent seen to be the problem here thanks though
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Old 05-20-2003, 06:55 PM   #6
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Yup its the sensor.....I had the problem...Poped the sensor out of a junked 93 and put it in mine....Light never comes on.....Problem Solved
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Old 05-20-2003, 06:57 PM   #7
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Default Re: Low Coolant

Quote:
Originally Posted by Red Baron
every time i start my car its fine but once i drive a few seconds the low coolant light comes on, but im not low on collant. i just had my rad flushed and i got them to but dexcool in but the light still comes on, is there a low coolant sensor that could be faulty if so does anybody know where this this is
Yes, mine'* faulty, too. I thought maybe the bad chemistry of my really old coolant was triggering it. Last fall I did a complete flush-and-fill (even added the Prestone flushing tee in the heater hose, and boy was _that_ a pain to install), got the mixture of the new stuff just right, but the sensor'* still complaining.

It'* plugged in on the passenger'* side of the radiator, about 1/3rd of the way down. Look straight down the back side of the radiator directly below the radiator cap. You'll find a two-wire electrical connector plugged into a square-ish plastic thingy. Unplug the connector and the warning will shut up. I forget how the sensor itself removes (it'* real easy -- it more-or-less just plugs into a hole), but of course the coolant comes gushing out when you do that, so don't pull the old sensor out until you have a replacement ready to go in.

Speaking of which, can anyone provide a part number and price?
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Old 05-20-2003, 11:19 PM   #8
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i don't know exactly why but i have heard that it is a very bad idea to switch from the green stuff to dexcool
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Old 05-20-2003, 11:24 PM   #9
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Ya...if the car comes equipped with Dexcool it says very clearly on the reservior "Use Dexcool only"

Stick with the green coolant, I doubt it was meant to be mixed. Wasn't there a huge post about this beofre somewhere?
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Old 05-20-2003, 11:25 PM   #10
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I have had to replace my sensor twice in the last 3 yrs. As soon as I put the new one in problem goes away, but they are not cheap from the dealer. I paid about $50-$60 part #25696947 for 96 SSEI. The wreckers is worth a try like Polarbear says.
Siphon some of the antifreeze out into a bucket before unplugging it.
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