Q: Fiero begins to overheat when at idle/ driving slow

asked by on

Car has been running GREAT until today when i was driving thru town and got stopped at alot of redlights it began to heat up. Ran fine on way home on Highway while going faster until i got to my neighborhood and had to slow down began to overheat again

My car has 64000 miles.
My car has an automatic transmission.

This can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant temperature by turning on and off at specific temperature thresholds. When this switch is not working properly, this can cause the fans to come on intermittently, all the time or sometimes not at all. When this happens you will notice a temperature spike and drop occasionally as the fan comes on and off. This may be more noticeable when sitting at a stop or idling vs driving down the highway due to the fact that there is no air blowing past the radiator to cool it off as it does when driving down the highway. When your thermostat is not working properly or is stuck closed, this will not allow the coolant to properly circulate through the engine, which may cause the engine temperature to fluctuate erratically or in some cases just remain hot. I would suggest having an expert from Your Mechanic come to your home to diagnose your cooling system.

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. Fiero begins to overheat when at idle/ driving slow

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: Can't Start Engine after rebuild

Hi - congrats on being very thorough with your testing! If you spritz some starter fluid into the throttle body, will this start it for a second or two? That would confirm the total of your testing - that you...

Q: AWD not working when the rear is overheating.

Hi there. Check the oil level on the rear differential to your vehicle. The oil level may be low and causing the differential to overheat. Look for signs of leaks and any loose bolts. If the level is low, top...

Q: Lost power - 1986 Dodge W250

Hello. Your issue falls within a very standard electrical system diagnostic that a YourMechanic professional can accomplish during a mobile visit to your home or office. Typically, an incident of the type you are describing is caused by wiring harness...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.