Skip the auto shop - Our mechanics make house calls

Q: The thermostat has been replaced in my car twice in six months because the Service Engine Light keeps coming on

asked by on

when my car first ran hot I had the thermostat replaced a few months afterwards my service engine light came on again and went to autozone and it said replace thermostat...so mechanic thought something was wrong with thermostat so he took it out and replaced it...now two months later my engine light is on again saying replace thermostrat again....its has to be something else wrong

My car has 139000 miles.
My car has an automatic transmission.

A: The thermostats on this engine have an elec...

The thermostats on this engine have an electrical heater element intended to help the engine warm up faster. Many thermostat housings for this engine are plastic - from different suppliers. The plastic housings tend to leak around the heater wire plug, and corrode. Engine management "sees" the bad connection from corrosion to the thermostat heater as a failure, setting a problem code for ’replace the thermostat’.

Replace the thermostat with one with a metal housing, and the problem should go away. I would recommend having a thermostat replacement completed by a mobile, professional mechanic, such as one from YourMechanic, to diagnose this problem, get an accurate assessment of damage and cost estimate for repairs.

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

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: timing belt and tensioner replacement

Hello. All noises have to be diagnosed and confirmed so that you don't needlessly spend money on repairs. In your circumstance, your particular car model does require a new timing belt every 60,000 miles anyway, so if the timing belt...

Q: My low beam headlights will not work how can I fix this?

Hi there, thanks for writing in. If the headlamps are not coming on at all, then you may have an issue with the control circuit. The controls for these lights come from the body control module. It is common for...

Q: Car shakes

The engine computer would need to be scanned to see if the engine is misfiring. That would lead to a possible coil, or spark plug failure. Depending on your car's mileage, there may be a coil and plug issue. I...

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...
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...
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.