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Car overheated heater was blowing cool air

Tiny
ROCK209
  • MEMBER
  • 1993 BMW 318I
  • 89,000 MILES
My car over heated I replaced the clutch fan radiator my thermostat wasn't opening can I drive with out a thermostat in hot days. I had coolant fan is working new raidiator and belt no water in oil
Friday, September 23rd, 2011 AT 8:04 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

A stuck closed thermostat will prevent the coolant flow. Which can affect the heater performance.
It is possible to run the vehicle without the thermostat. However, it is best to replace it especially since you will have to remove the housing to take it out anyways.

Keep in mind to only work on the cooling system when the engine is cool.

You might find these articles helpful:

https://www.2carpros.com/articles/how-an-engine-thermostat-works
https://www.2carpros.com/articles/replace-thermostat

I have attached diagrams of the thermostat replacement procedure below.

Please let me know if you have any questions.
Thank you.
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Thursday, December 16th, 2021 AT 9:05 PM

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