Last fall coolant light was intermittant (miutes at a time). Replaced coolant sensor in radiator. Same problem which after a few days changed to full-time coolant light on. Installed fresh 50/50 dex-cool,(did not drain block). Same problem. Tested radiator cap which was so-so and replaced it thinking i might be sucking air into system on cool-down, Still have same problem. Any ideas would be appreciated. Thanks,G.R.
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Re: low coolant light on 2000 chevy impala
There is a technical service bulletin that talks about engine oil contamination causing your problem. The bulletin number is 04-06-02-007 and is dated August 2004. If they came out with a bulletin on this it must be a common problem.
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1. If you need to jump start the car the battery is failing and you need to replace it. Other wise you may have an excessive power drain while the car is sitting which is running down the battery sufficiently so it will not run the starter motor.
2. If you have a low coolant warning light then you need to check the coolant level in the radiator when the engine has cooled and top it up using only the correct spec coolant for the car as specified by GM. Coolant level in the radiator needs to be checked very regularly in any event as does engine oil and power steering fluid level. If the coolant is low your engine will overheat and will likely cause very expensive engine damage many times what it will cost to fix the cause of the low coolant. You will have an external leak(such as a leaking radiator or leaking hose or failed radiator cap etc etc ) or an internal coolant leak that is causing the loss of coolant. Whatever the cause, and you need to have it investigated and repaired straight away if the cooling system continues to lose coolant.
To remove and replace a radiator is a major mechanical job, requires some quite complete equipment and some mechancal knowledge.
Last time I had my radiator replaced, it took about 2 hours for a proffesional radiator mechanic . Are you sure your really want to do it yourself?
Better then any "explanation", watch these youtube videos:
The coolant level sensor is located on the passenger side of the radiator, just below the bottom of the battery. If the light comes on, you'll need to fill the plastic coolant tank. But you also need to remove the radiator cap and fill the radiator itself. Only open the radiator when the engine is cold. If the radiator is full, and you are positive it's full, then the sensor needs to be replaced.
You may be low on coolant - or have an air bubble in the heater core! Make sure you have the right antifreeze and mix 50/50 with water. Start car, turn heater on max heat full blast and fill reservoir with coolant. If you have access to the radiator cap I would fill from there. This is a pressurized system, so it may blow some coolant out at you. Squeeze upper radiator hose to ensure it is full, cap radiator and now recheck the reservoir. If this doesn't help, you'll need to raise the front of the vehicle so the radiator cap is above the heater core hoses. Remove cap, start engine with heater and blower on high and fill radiator. Cap radiator before you lower the car and you should be good. Keep an eye on the coolant reservoir as you may have a leak which would cause the low coolant symptom. You also have a sensor to tell you is you are low on coolant. If you are and it is not lighting up, you may want to have it ( the sensor) tested and replaced. Good luck!!
Check the coolant top up reservoir. Low coolant sensor is usually in the overflow/reserve container.
Wash out and clean any dirt or corrosion from the sensor prong.
Refill to correct level with fresh coolant, then recheck alarm operation.
The coolant sensor located in the radiator is either gunked up or faulty if the fluid level stays ok.. The sensor is located on the engine side of the radiator about 3 inches from the top on the right side looking from behind the steering wheel