Service engine light soon turned on

MR266RAMIREZ

MEMBER
1999 CHEVROLET BLAZER
260,000 MILES

I recently bought the vehicle listed above from a tow yard. Everything works fine I had to replace the radiator and I'm running it without a thermostat. Since it sat in the tow yard for so long the computer won't read. Last night my service engine light soon came on and I am wondering if running it without a thermostat will cause that light to turn on?

3 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good afternoon,

Yes, it will but I need the code to confirm.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://www.2carpros.com/articles/check-engine-light-is-it-safe-to-drive

You must install the thermostat. If you do not you will damage the motor as it will not circulate coolant to the back of the motor.

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

https://www.2carpros.com/articles/replace-thermostat

Roy

Removal Procedure

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1. Remove the air inlet duct.
2. Remove the necessary coolant from the radiator.
Refer to Draining and Filling Cooling System.
3. Remove the upper radiator inlet hose.
4. Remove the coolant outlet bolts.

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5. Remove the coolant outlet from the lower intake manifold.
6. Remove the thermostat gasket.

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7. Remove the coolant thermostat.
8. Clean all the sealing surfaces of the coolant outlet.
9. Clean the sealing surface on the lower intake manifold.

Images (Click to make bigger)