Question about 1997 Pontiac Grand Prix

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Low Coolant light

.My low coolant light has been intermittently coming on and going off every 10 seconds or so. I added coolant and the light is still doing the same thing--I'm actually past the coolant level line now. Is there a way to re set this, or does it mean something bigger is wrong!

Thanks,

Cindy

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  • Expert
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Sounds like your sensor unit in your coolant overflow tank. Like nearly everything man made that floats, they will eventually leak (become water logged). This is a relatively cheap fix, as long as the light is coming on and the coolant level in the overflow tank is between the MIN and MAX lines in the overflow tank. This means that the float in there is dropping below the actual fluid level (watter logged) and you need to get a replacement sensor unit (aka sending unit) for the overflow tank.

Otherwise, if the coolant level in the overflow tank IS BELOW the MIN level line on the tank, then you are losing coolant somewhere and that is when things start to get expensive (might be a radiator problem, head gasket, cylinder head, heater core, etc).

Posted on Jul 19, 2009

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  • Pontiac Master
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A lot of the time it will take a while for it to read it,but if it doesn`t go off(the low coolant light) install a new low coolant sensor,and it will take care of the problem.

Posted on Jul 19, 2009

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Posted on Jan 02, 2017

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1 Answer

Code B0936 what is it


b0936 - When engine coolant is at the proper level, the low coolant switch is closed. When in this condition, battery voltage is applied to the low coolant 1478 input of the body control module (BCM).
When coolant is below the proper level, the coolant switch opens. Because no voltage is applied to circuit 1478, the BCM responds by sending a serial data message to the instrument panel cluster to turn On the low coolant light.
The BCM has an internal timer, which will not turn On the low coolant telltale unless the coolant level is low for greater than 30 seconds. The timer avoids coolant "sloshing" falsely turning On the light.
B0936 Coolant level sensor circuit malfunction .
Check for poor connection at BCM. Inspect harness connector for backed out terminals, improper terminal mating, broken connector locks, improperly formed or damaged terminals and poor terminal to wire connection (terminal crimped over wire insulation and not conductors).


?€¢
Inspect wiring harness for damage. Check for broken or chafed insulation.


?€¢
Check for poor connection at the low coolant switch.


?€¢
If fault is suspected to be intermittent, wiggling harness wiring may help in locating fault.



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