jmscdgn
Member
- Joined
- Sep 28, 2020
- Location
- Los Angeles
Dear Forum,
We are experiencing an unusual level of coolant loss in our 92 740T Wagon, with seemingly little side effects, and hoping the collective knowledge and experience here may be able to shed some light on the issue.
The issue:
We frequently drive Los Angeles to San Francisco on the 101 - around 450 miles. We begin with a cool engine and with coolant level topped up, to find that after 450 miles of driving and engine back to cool, the coolant has dropped by a full tank. This has happened every time for the past 4 - 5 drives up and down the coast.
The cooling system has been pressure tested by a local Volvo tech, and holds pressure.
We have hunted for a leak with UV dye/light and seen not a drop.
Spark plugs appear clean, and our MPG on the highway between cities is around 25 / 26.
The Head Gasket and water pump were replaced around 2500 miles ago, and the odometer is now approaching 140,000 miles.
Any insights or thoughts how best to proceed with troubleshooting this would be much appreciated.
Thanks for reading.
J
We are experiencing an unusual level of coolant loss in our 92 740T Wagon, with seemingly little side effects, and hoping the collective knowledge and experience here may be able to shed some light on the issue.
The issue:
We frequently drive Los Angeles to San Francisco on the 101 - around 450 miles. We begin with a cool engine and with coolant level topped up, to find that after 450 miles of driving and engine back to cool, the coolant has dropped by a full tank. This has happened every time for the past 4 - 5 drives up and down the coast.
The cooling system has been pressure tested by a local Volvo tech, and holds pressure.
We have hunted for a leak with UV dye/light and seen not a drop.
Spark plugs appear clean, and our MPG on the highway between cities is around 25 / 26.
The Head Gasket and water pump were replaced around 2500 miles ago, and the odometer is now approaching 140,000 miles.
Any insights or thoughts how best to proceed with troubleshooting this would be much appreciated.
Thanks for reading.
J