Skip the auto shop - Our mechanics make house calls

Q: Car running hot - 2006 Cadillac CTS

asked by on

While driving the temp gauge sits a little over the halfway Mark and will rise until the next line and move down and up while driving. If it sits on the line to long I will turn on the heat and it will lower to right above the half way mark. Also after I shut the car off if I hop back in after walking into a store the needle is high never in the red but high and will drop back down after the fan kicks in. Had the thermostat replaced and there is antifreeze is the car. I do notice a oil smell when driving but now all the time.

Hello. This can be caused by a few different things. Most of the time, this is caused by a restricted radiator or a water pump that is getting weak. It can also be caused by a head gasket that has a small leak and it allowing combustion pressure to enter the cooling system. I usually start by doing a block test first. This will tell me if it is a head gasket issue.

If the test is positive, then the engine needs to be rebuilt. If not, then I check the temperature differences in the radiator to see if it is restricted and replace it, and check the water pump if there is a coolant flow issue. I also check to make sure that the fans are coming on when it gets hot. If not, then it may be a fan issue. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the overheating issue and advise you on the proper repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car feels like it's spinning tires when I accelerate from a stop

This is caused by the 1 to 2 clutch sealing rings inside the transmission. The transmission should be checked to verify - but this is the most common problem. The transmission will need to be removed and overhauled to be...

Q: Lose rpm and hard to start. I have a code p0336 that is read on a scanner.

Hi there. The code for P0336 is referring to the crankshaft position sensor loosing a signal to the computer. I recommend replacing the crankshaft position sensor and it should fix all of your problems. If you need further assistance with...

Q: Problems after thermostat, digital cluster & cooling pump replacements

It appears you may have a few different issues going on. It seems unlikely that more than one cluster would fail. The most likely cause is a shorted wiring or open circuit causing the clusters to fail. If the car...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...