Why Is Coolant Not Returning From Overflow Tank. The coolant can flow into the overflow tank but the hose is not airtight to draw the coolant back to the radiator. I would suspect either the hose from the rad to the overflow is cracked or somehow defective, or , more likely, the rad cap is finished.put a new one on.
My first thought though was that the small tube running from your radiator to the overflow tank is not airtight. This volume expansion also increases the radiator’s pressure and the cooling system. A test would be if you open it when cooled off there should be a rush of air past the cap when its released enough to relax the force on the gasket.
$3,000.00 Is The Estimate To Replace The Head Gasket, Water Pump, And Timing Belt, If The Head Does Not Need To Be Rebuilt.
A test would be if you open it when cooled off there should be a rush of air past the cap when its released enough to relax the force on the gasket. So i finally got my truck back up and running again and took it for a test run to get everything moving on her again. If the tank is damaged or not connected to the radiator correctly, the coolant will not siphon back into the cooling system when the engine cools off.
You May Have Some Crud In The Hose Or On The Bottom Of The Overflow Tank.
The rad to overflow tank tube and the tube inside the overflow tank, just be good, no cracks. When the engine in your car heats up, the coolant expands. The radiator cap is designed to allow access to fluids in a ‘closed' system.
If The Crack Is On The Inside, Then Any Drainage Would Go Back Into The Reservoir And Not Spill Out On The Ground, But It Would Break The Vacuum That Would.
Check your owner's manual for proper cap replacement. If yours is not pulling the coolant back there are 3 possibilities. The expanding coolant flows out but when it contracts as it cools, air gets sucked back into the radiator instead of coolant.
1) The Hose Between Rad And Reservoir Is Pinched Or Otherwise Obstructed;
You can test that for free at autozone. The coolant used to cool the engine does so at maximum efficiency when kept at specific pressure. 2) the system is not sealed (leaky), and air can enter more easily than the fluid from the reservoir.
Disconnect The Hose From The Top Of The Radiator And Blow Through It.
I take that back, you are wrong. You drive an the rad coolant expands. The problem is a blown head gasket putting exhaust into the cooling system forcing out the coolant.