Closed-loop refilling and pressure testing system for modern motor vehicle cooling systems

A fluid refilling and pressure testing apparatus for filling and pressure testing cooling systems comprising:

• a tank having a sidewall, a top wall, and a bottom wall, all defining said reservoir;
• a first fluid circuit, said first fluid circuit comprising:
• a delivery conduit adapted at a first end for sealed engagement with the pressurized coolant fluid circuit of an internal combustion engine;
• said delivery conduit in sealed communication at a second end with a fluid supply;
• means to pressurize said fluid supply communicated to said second end of said delivery conduit;
• a return conduit adapted at a first end for sealed communication with said coolant fluid circuit;
• said return conduit communicating at second end with said reservoir through a means to impede fluid flow;
• said means to impede fluid flow impeding the flow of coolant fluid communicated from said return conduit thereby increasing coolant fluid pressure in said pressurized coolant fluid circuit to a determined fluid pressure level;
• said means to imped fluid flow venting said coolant fluid pressure substantially instantaneously to said reservoir once said determined fluid pressure level is reached thereby creating a surge of fluid through said coolant fluid circuit and said return conduit;
• a second fluid circuit, said second fluid circuit bypassing said means to impede fluid flow, whereby fluid communicated through said return conduit communicates directly with said reservoir;
• a third fluid circuit, said third fluid circuit bypassing said means to impede fluid flow and communicating fluid from said return conduit to a remote fluid container, said remote fluid container being separated from communication with said reservoir;
• and
• means to switch between said first fluid circuit, said second fluid circuit, and said third fluid circuit, whereby fluid from said fluid supply can be pumped through said cooling system and be circulated through either of first fluid circuit, said second fluid circuit, or said third fluid circuit.