Q: My temperature gauge is fluctuating and my car is not putting out heat anymore, I tried putting coolant in it and there are no leaks.

asked by on December 20, 2016

My car is not putting out heat, it is 19 degrees outside and the temperature gauge is going all the way to the top when I'm driving so I have to keep stopping on the side of the road to let it cool down. I am going on a 12 hour drive and it is making it very difficult

My car has 140430 miles.
My car has an automatic transmission.

Heater is not working Inspection $94.99 - $114.99 Get a Quote

Hi there. Check the coolant temperature sensor and see if it has a loose connection on the wiring harness. This will cause the gauge to fluctuate up and down as the engine is running. For the heater not working, check the heater control valve on the heater hoses and see if its working. If the hoses are cooler on the cab side and the engine side hoses are hot, then the valve is not working and it should be replaced. If you need further assistance with your heater not working, then seek out a professional, such as one from Your Mechanic, to help you.

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

Car clicking when starting.

The starter (https://www.yourmechanic.com/services/starter-replacement) solenoids on the expeditions are known to just quit with no warning. Before replacing the solenoid however, the battery should be fully charged and load-tested to eliminate it from being the issue. The solenoid is tested via...

Hit deer; car damaged

It seems like there has been extensive damage that has taken much of the safety away from this vehicle. I would recommend consulting the services of a collision center. The twisted metal and broken parts will cause wear on the...

my question is can a rear main seal leak spray oil up into the engine compartment on top of the valve cover area on passenger sid?

It may be possible since the oil can run down the oil pan and then get into the belts and slug up the passenger side of the motor. This is not as likely as the front of the engine crankshaft...

All lights are working except my tail lights. What's the problem?

The front and rear parking lights are on the same circuit, so first, check to see if the front parking lights are working. If the parking lights are not working with the headlight switch in the on position, then locate...

What rear end will direct swap with a C200 rear end?

Hello and thank you for contacting YourMechanic. You can put any Nissan or Toyota axle on the vehicle. If you use a different rear axle, you will need to switch the yoke to match the drive shaft and you may...

How do I check the window wiper switch?

The most common cause of the windshield wipers intermittent wipers do not work or it is only working intermittently is the multifunction switch. (https://www.yourmechanic.com/services/turn-signal-switch-replacement) The switch incorporates the turn signals and flash to pass for headlights. I would recommend having...

Location of evap control solenoid

According to the manual it states the location of the purge control valve is connected between the intake manifold and the vapor line to the carbon canister under left side of vehicle behind drivers door. Follow the vapor pipe from...

Can I put in a motor from a different model car?

Hi there. Most of the time, when an engine swap is completed, it's with the precise engine that was offered in the vehicle you currently own. This is done to ensure you don't have misalignment issues, problems with transmission or...

2004 Cadillac cts 3.6 car only cranks when i jump start starter relay

Based on what you described, the only possibility is that the starter relay is faulty. You may have purchased a faulty one somehow. The reason that I say this is because if you eliminate the starter relay from the equation,...

Related articles

How Are Car Wires Protected From Damage?
The highest tech cars can contain miles of electrical wiring. Wires must be secured and protected from heat and debris in order to work properly.
A Buyer’s Guide to the 2012 Nissan 370Z
Whether Whether you opt for the roadster or the coupe in the 2012 Nissan 370Z, you will be choosing a machine that will provide outstanding performance and a luxurious interior that you won’t be able to tear yourself away from....
How Long Does a Crankshaft Position Sensor Last?
The The crankshaft position sensor monitors the rotational speed and position of the crankshaft in the engine. It reports this information to the engine management system to control the ignition system timing. The crankshaft position sensor is used with the...