Low Coolant light

AzSnake · Mar 11, 2004

Ok here’s the Question. Yesterday my car got stuck in traffic and it got real hot, went past the L on the heat gauge (was over 90 degrees out). Once I started moving it drop real quick. Since then my low coolant light has been clicking on and off but it’s on most of the time. My coolant is perfect as far as the level goes and the temp NEVER goes past between o and r. It runs pretty cool.
Any thoughts? Is there a sensor that detects the low coolant level that may have gone bad? Any thought would be appreciated.

sirhisss · Mar 11, 2004

You most likely have air in the system.

AzSnake · Mar 11, 2004

sirhisss said:
You most likely have air in the system.

Possibly but air trapped would cause a temp spike.
I get no temp spike at all.
I have done some other checking and I have found that the coolant level temp senser that located in the coolant resivour is a POS and they go bad quite ofter.
Problem is I have to replace the whole tank or unplug the sensor.

sirhisss · Mar 11, 2004

AzSnake said:
Possibly but air trapped would cause a temp spike.
I get no temp spike at all.
I have done some other checking and I have found that the coolant level temp senser that located in the coolant resivour is a POS and they go bad quite ofter.
Problem is I have to replace the whole tank or unplug the sensor.

Again, you may get a temp spike but not necessarily. I'd still burp the system first.
The temp sensor is in the crossover tube just below the alternator on the passenger side.

AmishRebel · Mar 11, 2004

did you try adding a little coolant or water. Mine used to give me that light all the time and visibly the coolant seemed full but the sensor will detect the most minute drop in coolant. Later I found out one of my hoses had a small pinhole that the previous owner patched and clamped and thats where the loss was occuring at an extremely slow rate.

sinisterblack98 · Mar 11, 2004

My 1998 GT coolant was starting to change color last year with only 24,000 miles and the sensor got "dirty" and would hang up. I cleaned the float sensor and shaft with Q-tips, it worked for 3 months until I sold it.

COBRA_SVT_VERT · Mar 12, 2004

Make darn sure that the high fan is coming on!

You can do this by running the car at idle and turning on the A/C to high. This should kick on the high fan. If not, you probably have a bad ground or bad CCRM. Wiggle the connector around on the fan while the A/C is on high if the fan doesn't come on and see if you can make it come on. That would be a bad ground/power at the connector itself. I've seen this on more than one occasion.

It's amazing how quickly these cars will cool themselves with air moving around the engine, but if they stop for a few, they will heat up in a heartbeat without that high fan kicking on.

CobraCruiser · Mar 12, 2004

My '99 Cobra's coolant light used to come on for no reason. There was evidence of coolant around the cap on the overflow canister. The canister was replaced and they fiddled with something else and the problem finally stopped.

I never once had a temperature problem, although as long as yours was in the normal range, I can't see where there was any problem.

I didn't see in your post what year your car is or the mileage. I don't know much about the earlier model years.

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