Skip the auto shop - Our mechanics make house calls

Q: Temp. Gauge rises when I'm stopped or idling and when I run the AC but not when I'm moving.

asked by on

Recently I have noticed my temp gauge rise when I am stopped or idling and also when I run the AC. However, it begins to fall back down once I start to drive. At first I thought it was the fan clutch which I recently installed 2 days ago. Unfortunately, the problem is still there. There are no leaks from neither the water pump nor the radiator and my radiator and reservoir and completely filled. Could this be the work of a thermostat stuck closed or what ? Please let me know.

My car has 180000 miles.
My car has an automatic transmission.

A: If you are getting overheating only at lowe...

If you are getting overheating only at lower engine speeds with no obvious reasons, then you will need to check if there is good flow through the radiator using a laser temperature sensor. By doing this you will be able to see if there is any blockage in the radiator.

If the temperature is good in the radiator then you should check the operation of the water pump. If it is not pumping properly it should due to worn pump blades. Replace the water pump and recheck the system as necessary.

I'd suggest getting some help from a certified mechanic who can run these checks and diagnose your overheating issue firsthand. Good luck.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Heater/air won't turn on

Try checking the relay. Sometimes when the relay is not getting a good connection this can happen. I would also check all of the fuses. Sometimes when they have too heavy of a load they will blow which will in...

Q: i was driving down the expressway playing with the cruise when it just stopped running i have power but when i turn the switch

The cruise control should not be related to anything in your vehicle that would otherwise cause it to die. However, this is a known issue with the Chevy HHR and is often a result of unresolved electrical issue. I would...

Q: Truck overheating

Check to see if the cooling fan clutch is fully engaging when the engine is heating up. You can test this by putting a tissue in front of the radiator or condenser to see if the fan flow is strong...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...