Low Coolant Light Keeps Coming On?

jdlatil · 01-31-2003, 10:36 PM

Low coolant light on dash keeps coming on. When I shut off engine and check water level is fine. Start car back up and lights off, for a while till it happen again 10 miles or so down the road.
Any ideas?
thanks in advance
Jack

95/GT/5.0 · 02-01-2003, 12:23 AM

Sounds like you have a problem with the coolant level sensor located in the plastic overflow bottle.In my 95 it is anyway.I had the same problem.Take the cap of the overflow(not the radiator cap) the overflow cap and clean the sensor looks like a straw or tube,make shure nothing is blocking the opening,make shure the water level is on the full cold or full hot line,which ever the car is hot or cold.You may have to flush if dirty .Check the connection (wires at cap) and make shure there are no leaks in the water bottle.Turns out my water level was just a little low in the overflow bottle causing the light to come on.The light resets each time you turn your ignition off/on.If the light is on,even with a satisfied sensor it will not turn the light back off.You have to turn the ignition off to reset the computer.Hope this helps.

TwiLighTBluEGT · 02-01-2003, 12:39 AM

I had the same problem with my 91GT. I put up with it for over a year and finally was sick of it, so I bought a new sensor through ford. Hasn't come on since.

84LX89GT · 02-02-2003, 10:32 PM

I'm not exactly sure if that's a normally open or normally closed switch, but you can either unplug it temporarily or run a wire across the terminals to get the light off if it annoys you that bad. It sounds like the coolant level sensor.

Mach 1 · 02-03-2003, 04:13 AM

Make sure your checking your coolant level at the overflow bottle and not the rad. The rad might be full, but the overflow bottle empty, thus the light when you think its full...

01-31-2003, 10:36 PM	#1
jdlatil Registered Member Join Date: Jan 2002 Location: Gulfport MS Posts: 12	Low Coolant Light Keeps Coming On? Low coolant light on dash keeps coming on. When I shut off engine and check water level is fine. Start car back up and lights off, for a while till it happen again 10 miles or so down the road. Any ideas? thanks in advance Jack __________________ Jack 91 GT TFS TW heads, Edelbrock RPM, B31 cam, TRS RR, power pipe, Pro M 80, 42#inj, 70 TB, S-Trimed, 255lph FP, Kirby FPR, MSD 6AL BTM, 373 gears, shorty headers, mega bite jr. lower and adjustable uppers,sub frame, no cats, 2 1/2" with Flowmasters, billet Hurst, JMS Chip, Nitto 555r's, Under construction

02-01-2003, 12:23 AM	#2
95/GT/5.0 Registered Member Join Date: Dec 2002 Location: Biloxi.Mississippi Posts: 49	Sounds like you have a problem with the coolant level sensor located in the plastic overflow bottle.In my 95 it is anyway.I had the same problem.Take the cap of the overflow(not the radiator cap) the overflow cap and clean the sensor looks like a straw or tube,make shure nothing is blocking the opening,make shure the water level is on the full cold or full hot line,which ever the car is hot or cold.You may have to flush if dirty .Check the connection (wires at cap) and make shure there are no leaks in the water bottle.Turns out my water level was just a little low in the overflow bottle causing the light to come on.The light resets each time you turn your ignition off/on.If the light is on,even with a satisfied sensor it will not turn the light back off.You have to turn the ignition off to reset the computer.Hope this helps. __________________ 1995/GT/5.0

02-01-2003, 12:39 AM	#3
TwiLighTBluEGT Registered Member Join Date: Jun 2002 Location: Massachusetts Posts: 157	I had the same problem with my 91GT. I put up with it for over a year and finally was sick of it, so I bought a new sensor through ford. Hasn't come on since. __________________ 1991 Mustang GT Conv: 58,000 original miles, 2nd owner. Engine: FMS 65mm tb/spacer, C&L 73mm maf, MAC cai. Drivetrain: Built AOD w/ Edge 2800rpm lockup converter, hardened 3-4 inner shaft, Trans-Go shift kit, B&M supercooler, FMS 3.73 gears & aluminum d/s, rebuilt traction lock. Exhaust: BBK unequal length shorty headers, BBK o/r h-pipe, Flowmaster 2 chamber mufflers. Chassis/suspension/brakes: Kenny Brown supersubs. The rest is stock.

02-02-2003, 10:32 PM	#4
84LX89GT Mustangs Join Date: Jul 2000 Posts: 1,938	I'm not exactly sure if that's a normally open or normally closed switch, but you can either unplug it temporarily or run a wire across the terminals to get the light off if it annoys you that bad. It sounds like the coolant level sensor. __________________ 2005 Suzuki Hayabusa GSX1300-R 1980 Ford Thunderbird - 255 V8 ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain hi-po Mack Truck hood emblem 1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc. Sold 02/06/04 1989 Mustang GT ET: 13.304@102.29 mph (5-24-03) Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)

02-03-2003, 04:13 AM	#5
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	Make sure your checking your coolant level at the overflow bottle and not the rad. The rad might be full, but the overflow bottle empty, thus the light when you think its full... __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

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