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#1
11-14-2010, 10:23 AM
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Engine cooling light is on-99 Grand Prix GTP
The engine cooling light is one and I have enough coolant. I am told there is a low coolant sensor that goes bad. I have received conflicting information as to where it is located. Some say on the plastic coolant refill bottle and others say on the radiator. Can someone help me and does anyone have instructions perferably with a picture or two that would help me to my own replacement?
It is a 1999 Pontiac Grand Prix GTP. Thanks, Bob 
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#2
11-14-2010, 10:27 AM
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Re: Engine cooling light is on-99 Grand Prix GTP
On the radiator. About 4" below the radiator filler neck. We have many old threads on it. Just remove the passenger side headlamp for easier access.
__________________
'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#3
11-15-2010, 08:01 AM
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Re: Engine cooling light is on-99 Grand Prix GTP
Is there a easy way to search for the other threads that relate to this topic? When I try I seem to get all kinds of other subjects thrown into the mix. Is it easy to fix even for someone not highly experienced?
Thanks
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#4
11-15-2010, 10:03 AM
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Re: Engine cooling light is on-99 Grand Prix GTP
Did you recently change to prestone brand dex-cool? My car did this right after I got a coolant flush and used prestone instead of ac delco brand dex cool.
Cleaning the sensor would work for short periods of time but eventually I just got sick of it and changed it out.
__________________
-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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#5
11-17-2010, 11:41 AM
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Re: Engine cooling light is on-99 Grand Prix GTP
It's located just below the upper transmission cooler tube on the passenger side radiator tank. It's about 1-1/2" square, and has a wire harness connector coming off toward the ground. Here's a link to the picture from Delco's website:
http://webcaps.ecomm.gm.com/internet...umber=10096163 The round part facing up in the picture is what goes in the radiator, and the wire you see is the spring loaded retainer that actually holds it in place. Hope this helps.
__________________
 Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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#6
12-06-2010, 08:37 AM
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Re: Engine cooling light is on-99 Grand Prix GTP
FYI: My Low Coolant sensor issues ('99 GTP) were caused by brown sludge deposits, from the plaguing Lower Intake Manifold gasket. I got the gasket changed, and now my radiator filler neck remains spotless, and never had another Low Coolant light issue.
__________________
-Brent '99 GTP
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