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#1 |
Registered User
Join Date: Aug 2010
Location: Netherlands, The Hague
Posts: 1,518
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cold level in the coolant reservoir?
i changed my rad to an aluminum version and took a good look at my total cooling system.
I dont understand why there is a cold level in the coolant reservoir? isnt the only function of the reservoir "overflow"? so excessive coolant can flow freely at too high pressure in the rad? or does the coolant also get sucked back in? here is a old pic of my coolant tank, clearly showing the cool level.
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#2 |
Registered User
Join Date: Jul 2007
Location: Tucson, AZ
Posts: 3,188
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Re: cold level in the coolant reservoir?
Theoretically, I have read that the radiator should "put and take" from the reservoir as needed. I fill the reservoir to the cold level but I notice that the level drops a bit after a while - I think that the loose fitting fill cap allows for some evaporation.
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#3 |
Registered User
Join Date: Jun 2010
Location: Las Vegas, Nv
Posts: 312
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Re: cold level in the coolant reservoir?
I was always under the impression that it did indeed pull from the tank and into the radiator, as well as expand out of the rad to the tank.
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#4 | |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,194
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Re: cold level in the coolant reservoir?
Quote:
The "cool level" line is what allows you to set the proper fluid level, so that you can do it at your convenience (when the engine is cold) rather than after everything is heated up under there (like when checking automatic transmission fluid - which is a pain). K
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#5 |
~Rest In Peace~
Join Date: May 2005
Location: CALIFORNIA NOR CAL
Posts: 9,707
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Re: cold level in the coolant reservoir?
some will naturally evap as coolant loses its ph level and its strength, water will dissipate which will lower the level
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#6 |
Registered User
Join Date: Aug 2010
Location: Netherlands, The Hague
Posts: 1,518
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Re: cold level in the coolant reservoir?
hmmm...okay, I thought it only spilled into the tank at overpressure, but I'll watch it the next couple of days and see if the level changes...thanks guys...
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#7 |
Account Suspended
Join Date: Dec 2007
Location: Unnapreciative, Trollville
Posts: 2,079
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Re: cold level in the coolant reservoir?
The tank keeps the pressurized part of the system full. It also keeps from dumping coolant on the road.
Before they had coolant tanks, if you filled your radiator up full and went driving, when it got hot it would push coolant out and onto the road. Then when the radiator cooled down completely if you opened the radiator cap, it would be like an inch or so below full. Anytime you get it up to operating temperature, coolant comes out of the radiator and goes into the tank, and any time it cools down completely it sucks coolant back into the radiator. tanks an easy way to tell if you have enough coolant without touching or opening anything. |
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#8 | |
Registered User
Join Date: Feb 2011
Location: 3315 W Greenway Rd Phoenix, AZ
Posts: 20
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Re: cold level in the coolant reservoir?
Quote:
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#9 |
Registered User
Join Date: Aug 2010
Location: Netherlands, The Hague
Posts: 1,518
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Re: cold level in the coolant reservoir?
alrighty tighty guys! thanks very much, that clears things up!
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My dreamride / project:1977 GMC C15 Suburban In storage: Monster - 1974 GMC Suburban 25hundred Sold : Chevrolet Suburban K20 Silverado 1986 Guide: real HID projectors for 4x6 headlights link: DIY LED TAILLIGHTS |
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#10 |
Registered User
Join Date: Jul 2011
Location: SW Ontario
Posts: 1,204
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Re: cold level in the coolant reservoir?
The hip new term is 'coolant recovery system'.
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