![]() ![]() ![]() As I understand it, overflow bottles are used in modern systems because it is no longer acceptable to deposit coolant on the ground when a system is overfilled - i.e. Coolant sitting in the overflow bottle when the engine is operating does not contribute to the cooling of the engine. ![]() What matters is the volume of coolant in the system when it is at operating temperature. As others have suggested, you could install an unpressurized overflow bottle at the end of the overflow from the expansion tank, but it wouldn’t serve any useful purpose, as it would not increase the effective volume of the cooling system. By converting it to an overflow tank, you reduce the capacity of the closed system, and therefore the cooling capacity of the system as a whole. In the original design, the expansion tank is part of the closed system. Call it “modern”, but it’s a lot more confidence-inspiring than the original undersized wiring and “always hot” circuitry that could let the fabled smoke escape when least expected.īy doing what you suggest aren’t you simply reducing the effective volume of coolant in the system?The “effective volume” is that volume which is contained in the closed (pressurized) system and available to absorb the heat generated by the engine. I also replaced in-dash temp and oil pressure with more reliable analog units. I have upgraded my electrics by adding two Blue Sea 8-fuse blocks to the location of the original voltage regulator, put the high beams, lo beams, horn and cooling fans on relays behind the battery, moved ignition switch loads to under-dash relays and transferred fusing of all circuits from behind the drop-down dash panel to the new fuse blocks. I have no problem with subtle modifications if they increase safety or reliability. No, I’m simply suggesting that by putting a 2-way cap on the radiator, and a vented cap on the expansion tank, that the expansion tank would become the catch bottle, the expansion hose and tank would no longer be under pressure, and the original purpose of discharging expanded coolant into the tank and then recovering it via negative pressure in the system would still be served. Please enlighten me - the more I read the more confused I’m getting. Excess coolant escapes the pressure cap via the overflow hose and goes into the recovery tank, to be drawn back into radiator later via the 2-way valveĬould not the S2’s system be allowed to function similarly, with the 2-way pressure cap on the radiator and an un-pressurized AND VENTED cap used on the expansion tank? It seems that one could convert the expansion tank’s cap to a vented cap by removing the pressure plunger and leaving a small vent hole in the cap? The function of the loose metal disc is to open with negative pressure in the radiator (cooling down) and allow excess coolant to be sucked back into the system from the expansion tank.Īll other vehicles I have owned have a plastic coolant recovery tank, with a sealed but not pressurized cap, and a conventional 2-way pressure cap on the radiator. My car has a pressure cap on the radiator, described variously as 2-way or vented, with a large diameter rubber seal just under the top of the cap to seal the radiator neck, and the spring-loaded rubber seal on the pressure portion, and a loose metal disc on the bottom of the inner rubber seal. tank itself are all under max pressure of 7 lbs, and hot coolant expands into tank, to be drawn back into radiator as system cools down. This means the radiator, overflow hose to exp. As I thought I understood it, one is supposed to use a blanking cap (seems very hard to find) on the radiator and a 7 lb (no A/C) pressure cap on the expansion tank. I am very confused about the functioning of my '69 2+2’s coolant expansion tank. ![]()
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