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About 2 gallons of 50-50 mix of concentrated coolant and water.


where is the coolant temperature sensor locate


Check the coolant level. Not just the bottle but in the radiator too. The 3400 motor is known for leaking coolant at the intake manifold.


Low Coolant. Poor coolant circulation. Intake gasket. Head gasket.



Before changing the radiator on a 2001 Pontiac Montana the coolant must first be drained. After the drain remove the radiator mounts, fans, and hoses. Pull the radiator upwards.


1 and a half gallon of already mixed coolant



The "Low Coolant Sensor" on a 1997 Pontiac Montana is located appro 6" below the radiator cap which is on the left as your facing the engine. The sensor measures the fluid level in the radiator itself and is prone to giving false alarms when it gets dirty.


There are two separate sensors that play here. the "coolant temperature sensor" and "coolant LEVEL sensor". I suggest confirming which of these was replaced, as it is very common for them to be confused. likely you will find the coolant sensor that was replaced was the one on the engine (temperature); The LEVEL sensor is mounted either in the coolant resivoir or in the radiator. Probably just need the proper sensor replaced.


the coolant temperature sensor is faulty. It will need to be replaced


The coolant level sensor in the coolant reservoir detects the coolant level is low. The coolant system must have a leak in it somewhere. Have a trusted mechanic diagnose it soon before you do damage to the engine.


There are two separate sensors that play here. the "coolant temperature sensor" and "coolant LEVEL sensor". I suggest confirming which of these was replaced, as it is very common for them to be confused. likely you will find the coolant sensor that was replaced was the one on the engine (temperature); The LEVEL sensor is mounted either in the coolant resivoir or in the radiator. Probably just need the proper sensor replaced.


It is on the intake manifold near the thermostat housing.


Be careful there is a temperature coolant switch mounted next to the thermostat housing. I thought this was the sensor and replaced it by mistake. There is another sensor.


I just replaced the thermostat and gave the coolant system a flush and replaced the prestone. Seems to have done the job.


yes it is on the drivers side of the engine compartment,right on top you cant miss it.


it is located below thermostat on driver side.




The Pontiac Montana engine will overheat if the coolant gets low and is not refilled properly. If coolant is added, an air block WILL OCCUR preventing proper circulation unless owners manual is followed. There are 2 blleeder valves in coolant system. They must be opened & closed in proper sequence (see manual) or engine will overheat. I know-been there! Woodchuck The Pontiac Montana engine will overheat if the coolant gets low and is not refilled properly. If coolant is added, an air block WILL OCCUR preventing proper circulation unless owners manual is followed. There are 2 blleeder valves in coolant system. They must be opened & closed in proper sequence (see manual) or engine will overheat. I know-been there! Woodchuck


You are OVERHEATING. You most likely have an intake or Head gasket problem.


The water leak in the Montana could be anywhere in the coolant system. Check the radiator, heater core,and hoses first, as they are common places for the leak to occur.


No coolant Thermostat not opening Defective temperature sensor


Could be low coolant, stuck thermostat, bad heater control head (if climate control)



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