Q: What's makes the temperature hand goes up then down?

asked by on

The temperature hand goes up to normal then goes to cold. The heater starts out warm then blows cold air.

My car has 150000 miles.
My car has a manual transmission.

If you are referring to the engine coolant temperature gauge on the instrument panel, unless the gauge is misreporting the temperature, a likely cause of too low of an engine temperature is a cooling system thermostat that is stuck in the full open position. If the thermostat is stuck open and the coolant is too low in temperature that would account for the inadequate heat in the cabin. There is also a heater control valve which you want to check and see if it is fully open, that is allowing hot engine coolant to enter the heater core (little radiator) in the passenger compartment. If you wish to schedule a heater is not working diagnostic please contact YourMechanic and they will dispatch a certified professional to assist you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. What's makes the temperature hand goes up then down?

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: Heater is not working - 2003 Chevrolet S10

Hello. A malfunctioning heater can be caused by many things. The first thing I would do is check to make sure that the coolant is topped off at the proper level. If it is low, coolant may not be reaching...

Q: Ok i replaced the primary and secondary coils on my 97 dodge 2500 ram van 6cyl. .ereased the p351 code and my ehuast mufller blew

Backfiring is often caused by a too lean or too rich air-to-fuel ratio although a few other causes are discussed below. A backfire in the intake manifold is caused by a ratio that is too lean (not enough fuel). A...

Q: Oil leak issues

If you open the oil cap while the engine is running to see if excessive amounts of oil smoke comes out indicating the engine has excessive blow by the pistons. The engine piston rings are most likely not sealing. You...

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...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...