Do you have to bleed radiator after changing thermostat?

First off, yes you do need to bleed the cooling system after opening it. Most of the time it’ll be fine but risking an engine overheat after not doing done something that takes a few minutes is foolish. Bleeding means removing any air that is trapped in the closed system.

What happens if you dont bleed your cooling system?

If you don’t bleed the coolant system you can have air pockets in it. This can cause the gauge to spike and can lead to overheating. The coolant system can self-bleed some between the thermostat and over-flow tank, but to do it properly you should fill the coolant and run the car with the radiator cap off.

Where is the relay on a radiator fan?

The fan relay is often located in the engine bay’s fuse box, but the best way is to check your repair manual to find where it is located. Testing a 4 pin relay is often very straightforward. Remove the relay and give 12 volts to pin 30 and 85. Ground pin 86 and check if there is voltage coming out from pin 87.

Why is my Isuzu truck overheating after replacing the thermostat?

This will cause the flow of the coolant in the system to be restricted, causing the truck to overheat. A clog in the heater core could also cause this problem. However, if the car is still getting heat, the heater core can easily be ruled out. The most likely cause is a clogged radiator.

What does it mean when your radiator fan is not working?

This is what we call a blown fuse. A blown fuse is no big deal, and changing one does not cost a lot of money. If your car’s radiator fan is non-functional, check your car’s user manual and locate the fuse for the radiator fan controller or the fan.

Why is my car overheating after replacing the thermostat?

A clog in the heater core could also cause this problem. However, if the car is still getting heat, the heater core can easily be ruled out. The most likely cause is a clogged radiator. I would recommend that you have a certified technician complete a system check in order to pinpoint your overheating problem. Was this answer helpful?