Q: Do I have a bad coolant temperature switch?

asked by on October 23, 2016

My temperature gauge is reading hot almost immediately after I start to run the car. The coolant is full, and I just replaced the thermastat. Is there anything else that my be causing the problem?

My car has 138000 miles.
My car has an automatic transmission.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do I disable the Courtesy Wipe feature?
There is a feature that includes an extra wipe of the windshield wipers after every wash. This feature is called the Courtesy Wipe. To disable the Courtesy Wipe. Press the Setup button until you see the Courtesy Wipe feature. Press...
Car is not starting and new battery didn't work
Hello. It sounds like the battery fuse (https://www.yourmechanic.com/services/fuse-replacement) may have blown out. The battery fuse is a high amp fuse that can range from 80-amps to 120-amps, and is bolted to the fuse box. It also sounds like there may...
My car has a P0171 fuel system too lean code. The map sensor is ok at .95v, the fuel trim is at 122 and the 02 sensor is reading rich.
Hi there, thanks for writing in. The P0171 lean fuel system code (https://www.yourmechanic.com/article/p0171-obd-ii-trouble-code-system-too-lean-bank-1-by-andrew-quinn) can mean a variety of potential issues are at play, such as intake air leaks (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-cold-air-intake), a faulty front heated oxygen sensor (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-oxygen-sensor), ignition misfiring, faulty fuel...
Cranks but won't start
You are right on track. You may be dealing with several issues at once. The first thing you should do for this starting issue (https://www.yourmechanic.com/services/car-will-not-turn-over-inspection) is check for proper spark. You need to check with an actual tester, and do...
Resetting the PATS (Passive Anti Theft System)
The passive anti-thief system (PATS) is programmed to work with your keys from the factory. Only a dealer with special programming tools and codes can reprogram the system to your key again. If you have one key that is programmed...
Accelerator is not responding
This may be a sign of a failing throttle position sensor (https://www.yourmechanic.com/services/throttle-position-sensor-replacement). The throttle position sensor (TPS) is a sensor used to monitor the throttle position of the throttle plate inside the throttle body in relation to your foot position...
I have replaced the break pads, calipers, and rotors on my 2003 ford explorer. My breaks keep locking up. I have also replaced the master cylinder.
Check the combination valve on the brake system. If the valve is sticking, then the fluid could be getting trapped and not returning. To check this valve, loosen the brake line on the back side of the valve (the side...
Car stopped while I was driving it; Check engine light is also on.
Have your computer checked to see if there is any pending or stored codes. This will lead you to a location on the engine for troubleshooting. There are many symptoms that can contribute to a stalling and no start condition...

Related articles

2012 Toyota Tacoma vs. 2012 Nissan Frontier: Which One Should I Buy?
The smaller truck category includes those vehicles for men (and women!) who just want to scoot around town but who are opposed to driving a small car and just prefer a truck. These relatively fuel-efficient vehicles offer little in the...
The Best Used Cars to Buy If You Like to Go Off-Roading
Your Your best bet for off-roading is a 4x4 SUV. Depending on the model that pleases you most, though, you might have to shop around a bit to find a good used one. That’s simply because off-roaders typically become very...
The Best Used Cars to Buy If You’re an Interior Designer
As As an interior designer, you need to transport a great many different items, including fabric, paint and wallpaper samples and sometimes even furniture items. You probably don’t handle overly large loads very often, and when you have to, you’ll...