Skip the auto shop - Our mechanics make house calls

Q: Effects of an old engine thermostat

asked by on

I think my engine's thermostat stuck old and it takes forever to warm up and it even stays cold on the highway. Is it bad for the engine to drive like this?

Yes this is actually bad. Get a thermostat. For most cars, they don’t cost much, unless you own one of those V12 Jaguars, that you’ve got to take the intake manifold off to change it or a VR8 Volkswagen where you have to pull the heads off to change it.

You’ll need to change the thermostat because, if you run it too cold, it’s bad on the engine main bearings and they can wear off because they aren’t running at the right temperature. The engine has to run on right temperature so that all the metal heats up right. If you need help with this, a certified mechanic, such as one from YourMechanic can replace your thermostat so that you can get your car back on the road safely.

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!
  1. Home
  2. Questions
  3. Effects of an old engine thermostat

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: Thermostat

Your truck will use either thermostat, but the 180 thermostat may be the better option providing better cooling and keeping engine temperatures lower overall. The difference is simply the temperature at which the thermostat opens, thus the 180 thermostat being...

Q: Instructions on how to replace a rear wheel bearing

The bearing is contained within a unitized hub assembly that is bolted to the knuckle. The entire assembly is replaced (i.e., bearing with hub). A calibrated torque wrench has to be used because the axle retaining nut has to be...

Q: Thermostat stuck

If you are referring to the engine cooling system thermostat, if that thermostat is stuck closed or partly closed, your engine will overheat but such will be obvious upon reading the engine temperature gauge on the instrument panel. Obviously, if...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.