RADIATOR PLUGGED???
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Junior User
Joined: May 2019
Posts: 56
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From: Orlando
RADIATOR PLUGGED???
Just bought my first used truck. Changing all fluids.
Does anyone have some suggestions on bleeding out the air when adding new coolant? Can't seem to get heat at floor so I'm assuming there is an air block?
Does an air block prevent the AC from working properly? Further, what is best way to tell if radiator is plugged?
Many thanks to anyone who can shed some light on this.
Does anyone have some suggestions on bleeding out the air when adding new coolant? Can't seem to get heat at floor so I'm assuming there is an air block?
Does an air block prevent the AC from working properly? Further, what is best way to tell if radiator is plugged?
Many thanks to anyone who can shed some light on this.
Senior User
Joined: Oct 2001
Posts: 178
Likes: 0
Just bought my first used truck. Changing all fluids.
Does anyone have some suggestions on bleeding out the air when adding new coolant? Can't seem to get heat at floor so I'm assuming there is an air block?
Does an air block prevent the AC from working properly? Further, what is best way to tell if radiator is plugged?
Many thanks to anyone who can shed some light on this.
Does anyone have some suggestions on bleeding out the air when adding new coolant? Can't seem to get heat at floor so I'm assuming there is an air block?
Does an air block prevent the AC from working properly? Further, what is best way to tell if radiator is plugged?
Many thanks to anyone who can shed some light on this.
Fleet Owner
Joined: Apr 2008
Posts: 24,322
Likes: 5,132
From: 0,0,1
Take it for a quick drive. Between the motion and the changing RPMs the air will be pushed through. Be sure to check the coolant level after.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
If the temp gauge spikes then retreats back at times, it's air lock causing the action.
Start from cold, cap off the tank and let it run to temperature. Fill to level as needed.
Once the motor cools completely check to see of there is a vacuum in the tank by loosening the cap.
If you hear a hiss, the system seals ok. If not there is a leak.
.
A bottom plugged radiator usually will cool ok running under light loads but heat up under higher loads due to reduced
cooling capacity.
Good luck.
Start from cold, cap off the tank and let it run to temperature. Fill to level as needed.
Once the motor cools completely check to see of there is a vacuum in the tank by loosening the cap.
If you hear a hiss, the system seals ok. If not there is a leak.
.
A bottom plugged radiator usually will cool ok running under light loads but heat up under higher loads due to reduced
cooling capacity.
Good luck.
Thread Starter
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Junior User
Joined: May 2019
Posts: 56
Likes: 0
From: Orlando
Good Advice
Thank you guys for your input. I'm amazed that these side mounted plastic reservoirs are so difficult to get completely bled. I finally have strong heat at floor level, which tells me I'm bout where I need to be.
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Junior User
Joined: May 2019
Posts: 56
Likes: 0
From: Orlando
I BURPED
I burped the upper hose by squeezing it til air bubbles stopped surfacing in tank reservoir. This was done over several starts and cool downs over a few days since the vehicle is not currently in service. I had almost convinced myself that the radiator or heater coil was plugged. Jury still out on radiator however.
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