Skip the auto shop - Our mechanics make house calls

Q: Question about thermostat replacement and radiator cooling fan switch replacement

asked by on

I have two quick questions:

  1. When your mechanic replaces a thermostat and radiator cooling fan switch, does he do air bleeding when the replacement is done?
  2. When doing the replacement, does your mechanic drain all of the coolant in the cooling system, or simply does he add some additional coolant when done?

Thanks for your time and help.

My car has 150000 miles.
My car has an automatic transmission.

Hi there. Anytime the coolant system is worked on, a professional mechanic should verify the service steps with the manufacturer’s service guide. This will help them determine the right steps to complete the coolant bleeding - if it’s mandated by the individual manufacturer. It’s also a standard operating procedure for a mechanic to drain the coolant anytime replacing coolant system components; such as thermostat or coolant lines.

The radiator cooling fan relay is not one of those items that generally requires the fluid to be fully drained, but some mechanics will flush the radiator as a preventive maintenance service.

If you need to have further help having this checked, a certified technician from YourMechanic can come to your location to pinpoint any faults in the system.

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
  • Home
  • Questions
  • Question about thermostat replacement and radiator cooling fan switch replacement

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: Leaking radiator cap

Hello there: Most of the time, the smoke you see coming from the front of the vehicle that has a coolant leak from the radiator cap is steam. This is an indicator that the radiator cap needs to be replaced;...

Q: Looking to get my radio code

You will only be able to get the radio code by taking out the radio and getting part numbers and identify numbers off of radio and get the dealer to look them up for you. Otherwise there are pay services...

Q: Possible bad thermostat

Your problem could stem from various sources: the thermostat may be stuck, the system may be plugged, the fans may not work, or the engine head gasket may be blown. You might only need to replace the thermostat, however, a...

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...
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...
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.