Coolant By-pass flow valve -- How It Works Illustration And Why?
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Thermostat Coolant By-Pass Flow Valve -- How It Works Illustration And Why?
Found a simplified illustration while doing research on thermostat options for my D2 and thought it might help others better understand the cooling systems on some of our LRs. Attachment and explanation of why the by-pass came from here: '+'
I reread the description in the D2 WM and found it again to be sketchy at best. The RR 99-02 uses a similar system and WM has a better description IMO.
These LR thermostats control the flow of coolant from radiator to pump. Inline thermostat modification will controls flow of coolant from engine to radiator & does away with the by-pass.
When LR by-pass type thermostat opens it's allowing close to normal temp coolant to flow from radiator. On initial warm-up when the inline thermostat opens cooler than normal coolant will temporarily flow from radiator.
......
Note: The coloration in bottom illustration of full warm should be all magenta.
I reread the description in the D2 WM and found it again to be sketchy at best. The RR 99-02 uses a similar system and WM has a better description IMO.
These LR thermostats control the flow of coolant from radiator to pump. Inline thermostat modification will controls flow of coolant from engine to radiator & does away with the by-pass.
When LR by-pass type thermostat opens it's allowing close to normal temp coolant to flow from radiator. On initial warm-up when the inline thermostat opens cooler than normal coolant will temporarily flow from radiator.
......
Note: The coloration in bottom illustration of full warm should be all magenta.
Last edited by number9; Jan 21, 2016 at 06:48 PM. Reason: Add coloration note.
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