Air in coolant

pickup
nissan

#1

have air trap in coolant after water pump replace.cannot get it out.do i need to drain coolant again and start over.1997 nissan pickup 2.4 liter.


#2

No, you don’t need to drain the coolant again, you just have to figure out how to get the air out of the system. Some vehicles have a bleed valve specifically for this purpose. Does your truck have such a valve?

Sometimes you can do it by parking the car facing up a steep hill and allowing the air to escape via the radiator cap.

Sometimes.

Who replaced the water pump?

Do you have a service manual?


#3

the truck do have a bleed valve.do the truck need to be running or not.when i open the valve.


#4

That’s why I asked if you had a service manual. A manual would have the correct answer to your question.

I don’t know the correct answer.

I’d try it both ways. What you want is to get the air out of the system. Anything that works, works.

Good luck.