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Tim 7/14/2020

2006 Buick Lucerne CXL 6 Cyl 3.80L


Overheating but not constant.

my car will get hot within 10 minutes. The temperature will spike for about 15 seconds, then will go back to normal. Then will spike again. No smoke or any coolant leaking. Could that be just a bad thermostat?

2 Answers

Teddy B

Teddy B 7/14/2020

It could be a worn out/failing thermostat.

My question is: why have you not changed the thermostat
after 7 years (2012 & 2019) that would possibly eliminate that
issue & just be part of regular Preventative Maintenance?

You should be replacing the coolant every 3 or 4 years anyway,
so do the thermostat every other coolant change.

You have all sorts of Vehicle Systems you can check Data on,as well
as Physical & Component Testing to find a problem.

Goes back to normal for the rest of the day or trip to somewhere,
or until the next Key Cycle or until the coolant drops below 140 degrees
& you start scanning OBD Data again,depending on the vehicles strategy.

Is there coolant in the radiator & degas bottle ?

Are there leaves & debris in front of the condenser/radiator ?

Only happens when you turn A/C on ?

Teddy B

Teddy B 7/14/2020

Is the car even overheating ?
Need to confirm that first.
Look at Scan Tool Data for the Temperature Sensor.
Could be a failed Stepper Motor (Gauge) in the Instrument Cluster.
or cracked solder joints on the circuit board.


Jimm 7/15/2020

In addition to the advice and items already recommended by Teddy B,.

Loss of coolant because of a coolant leak is probably the most common cause of engine overheating. Possible leak points include hoses, the radiator, heater core, water pump, thermostat housing, head gasket, freeze plugs, automatic transmission oil cooler, cylinder head(s) and block.

Make a careful visual inspection of the entire cooling system, and then PRESSURE TEST the cooling system and radiator cap. A pressure test will reveal internal leaks such as seepage past the head gasket as well as cracks in the head or block. A good system should hold 12 to 15 psi for 15 minutes or more with no loss in pressure. If it leaks pressure, there is an internal coolant leak (most likely a bad head gasket but possibly also a cracked cylinder or engine block).

It is important to pressure test the radiator cap, too, because a weak cap (or one with too low a pressure rating.

1. Perform a cooling system / radiator pressure test when the engine is cold - as a first step to locate the leak.
Obtain a loaner tool / free radiator pressure tester from the local auto parts stores such as Autozone, O'Reilly, NAPA, Advance Auto, or PepBoys. Follow their instructions and pump it to an adequate air pressure 12 -15 psi or the pressure rating listed on the radiator or reservoir cap. Observe the leaks and perform the repair.
Note: do not over pressurize beyond the pressure allowed by the radiator cap, then test the radiator cap as well.

2. Air pockets trapped in the cooling system can cause the engine to overheat. Some cooling systems have air bleed valves built into the system to aid in the removal of air pockets. Advice: For many cooling systems, the method of removing air pockets is to start the engine and allow it to run with the radiator cap off or loose until all the air escapes from the neck of the radiator. For some systems this method is not sufficient, and the manufacturer has installed air bleed valves usually near or on the thermostat housing.


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