METHOD FOR CHANGING COOLANT IN A VEHICLE ENGINE

Abstract

The present invention provides a system and method for efficiently replacing the coolant in a vehicle engine and for checking the integrity of the coolant system to identify leaks.

Claims

1. A method for vacuum filling a vehicular cooling system with coolant, comprising: providing a vehicular cooling system comprising a coolant reservoir having a coolant reservoir inlet and a coolant reservoir outlet, the coolant reservoir outlet being in liquid communication with the coolant reservoir inlet; providing a source of coolant; providing a fill tool, comprising a tube with an adaptor that connects to the coolant reservoir at the coolant reservoir inlet, an outlet for applying negative pressure, a first inlet for applying positive pressure, a second inlet for applying positive pressure, a knob to adjust pressure applied to the coolant reservoir, at least one valve to control air flow, at least one pressure gauge to monitor the pressure applied through the fill tool, and, optionally, a muffler to reduce noise from the fill tool; providing a source of pressure capable of applying positive or negative pressure through the fill tool; attaching the fill tool to the vehicular cooling system by connecting the adaptor to the coolant reservoir inlet to form an airtight seal; applying negative pressure to the cooling system inlet with the source of pressure through the fill tool; disconnecting a tube of the vehicular cooling system to create an opening in the vehicular coolant system; applying positive pressure to the coolant reservoir inlet with the source of pressure through the fill tool to evacuate coolant through the opening in the vehicular coolant system; connecting the source of coolant to the opening in the vehicular coolant system once the coolant is evacuated; and applying negative pressure to the cooling system inlet with the source of pressure through the fill tool to draw coolant into the vehicular coolant system from the source of coolant.

2. The method of claim 1, further comprising: after evacuating the coolant when the vehicular cooling system has little or no coolant reconnecting the tube of the vehicular cooling system to close the opening in the vehicular coolant system; applying negative pressure to the cooling system inlet with the source of pressure through the fill tool; and confirming that a vacuum is maintained throughout the vehicular cooling system after application of the negative pressure to evaluate the integrity of the cooling system.

3. The method of claim 1, wherein greater than 90% of the coolant is evacuated from the vehicular cooling system.

4. The method of claim 1, wherein the source of pressure is shop air.

5. A vehicle engine coolant changing system comprising: an old coolant container having an inlet opening and an outlet opening, a new coolant container having an inlet opening and an outlet opening, an adaptor for a coolant reservoir and having a passage there through, the adaptor has a tapered configuration to engage in service openings of various sizes, an old solution conduit interconnecting an engine interior and said inlet opening of the old coolant container for transfer of old coolant from the engine interior to the old coolant container, a new conduit interconnecting the new coolant container and the adapter to pass new coolant from the new coolant container into the engine, means to provide a partial vacuum in the old coolant container to draw old coolant from the engine interior into the old coolant container via a conduit, means to apply positive pressure to efficiently evacuate the old coolant while the vacuum is applied and to urge new coolant from the new coolant container into the engine, a first control operable to provide rapid and efficient changes in vacuum flow patterns via conduits and valves of the system, and a second control operable to provide rapid and efficient changes in positive pressure flow patterns via conduits and valves of the system.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 illustrates a representative embodiment of a fill tool with pressure gauges and an adaptor to connect to a vehicular coolant reservoir and apply negative or positive pressure in accordance with the embodiments provided herein.

[0009] FIG. 2 illustrates a closer view of the representative embodiment of the fill tool.

[0010] FIG. 3 illustrates a representative embodiment in which an optional muffler has been added to reduce the noise generated by the fill tool.

[0011] FIG. 4 illustrates another view of the representative embodiment with the optional muffler.

[0012] FIG. 5 illustrates a representative embodiment of the fill tool connected to a source of pressure (i.e., shop air) used for applying negative or positive pressure through the fill tool.

[0013] FIG. 6 illustrates another view of the fill tool connected to the source of pressure (i.e., shop air).

[0014] FIG. 7A illustrates an alternative embodiment of the fill tool connected to a coolant reservoir inlet and a source of pressure during the initial application of negative pressure to the vehicular cooling system. FIG. 7B illustrates the alternative embodiment of the fill tool connected to a coolant reservoir inlet and a sources of pressure during the removal of coolant from the vehicular cooling system.

DETAILED DESCRIPTION

[0015] In one embodiment, the disclosure provides a method for vacuum filling a vehicular cooling system with coolant, comprising: providing a vehicular cooling system comprising a coolant reservoir having a coolant reservoir inlet 111 and a coolant reservoir outlet, the coolant reservoir outlet being in liquid communication with the coolant reservoir inlet 111; providing a source of coolant; providing a fill tool, comprising a tube 102 with an adaptor 101 that connects to the coolant reservoir at the coolant reservoir inlet 111, an outlet 105 for applying negative pressure, a first inlet 104 for applying positive pressure, a second inlet 106 for applying positive pressure, a knob 108 to adjust pressure applied to the coolant reservoir, at least one valve 109 to control air flow, at least one pressure gauge 103 to monitor the pressure applied through the fill tool, and, optionally, a muffler 110 to reduce noise from the fill tool; and; providing a source of pressure 107 capable of applying positive or negative pressure through the fill tool; attaching the fill tool to the vehicular cooling system by connecting the adaptor 101 to the coolant reservoir inlet 111 to form an airtight seal; applying negative pressure to the cooling system inlet with the source of pressure 107 through the fill tool; disconnecting a tube of the vehicular cooling system to create an opening in the vehicular coolant system; applying positive pressure to the coolant reservoir inlet 111 with the source of pressure 107 through the fill tool to evacuate coolant through the opening in the vehicular coolant system; connecting the source of coolant to the opening in the vehicular coolant system once the coolant is evacuated; and applying negative pressure to the cooling system inlet with the source of pressure 107 through the fill tool to draw coolant into the vehicular coolant system from the source of coolant.

[0016] The “coolant reservoir” as used herein refers to both the reservoir where excess coolant is kept and the radiator of the vehicle.

[0017] In another embodiment, the method further comprises after evacuating the coolant when the vehicular cooling system has little or no coolant reconnecting the tube of the vehicular cooling system to close the opening in the vehicular coolant system; applying negative pressure to the cooling system inlet with the source of pressure 107 through the fill tool; and confirming that a vacuum is maintained throughout the vehicular cooling system after application of the negative pressure to evaluate the integrity of the cooling system.

[0018] In certain aspects, greater than 50%, greater than 60%, greater than 70%, greater than 80%, greater than 85%, greater than 90%, greater than 95%, or greater than 98% of the coolant is evacuated from the vehicular cooling system.

[0019] In other aspects, less than 20 psi, less than 19 psi, less than 18 psi, less than 17 psi, less than 16 psi, less than 15 psi, less than 14 psi, less than 13 psi, less than 12 psi, less than 11 psi, or less than 10 psi of pressure is applied to the vehicular cooling system through the fill tool at any point of the process.

[0020] In one embodiment, the coolant is collected in the source of pressure 107. The source of pressure 107 may be shop air. In one aspect, the shop air comprises a pressurized, air tight container that can be used to generate positive pressure for filling the vehicular cooling system with coolant or negative pressure for evacuation of coolant from the vehicular cooling system through the fill tool. In certain aspects, a vacuum is created in the pressurized air tight container to collect coolant evacuated from the vehicular cooling system. This evacuated coolant may then be disposed of or reintroduced into the vehicular cooling system from the hose 112 extending from the bottom of the pressurized air tight container.

[0021] In yet another embodiment, the disclosure is directed to a vehicle engine coolant changing system comprising: an old coolant container having an inlet opening and an outlet opening, a new coolant container having an inlet opening and an outlet opening, an adaptor 101 for a coolant reservoir and having a passage there through, the adaptor 101 has a tapered configuration to engage in service openings of various sizes, an old solution conduit interconnecting an engine interior and said inlet opening of the old coolant container for transfer of old coolant from the engine interior to the old coolant container, a new conduit interconnecting the new coolant container and the adapter to pass new coolant from the new coolant container into the engine, means to provide a partial vacuum in the old coolant container to draw old coolant from the engine interior into the old coolant container via a conduit, means to apply positive pressure to efficiently evacuate the old coolant while the vacuum is applied and to urge new coolant from the new coolant container into the engine, a first control operable to provide rapid and efficient changes in vacuum flow patterns via conduits and valves of the system, and a second control operable to provide rapid and efficient changes in positive pressure flow patterns via conduits and valves of the system.

[0022] It is understood that the disclosed invention is not limited to the particular methodology, protocols and materials described as these can vary. It is also understood that the terminology used herein is for the purposes of describing particular embodiments only and is not intended to limit the scope of the present invention which will be limited only by the appended claims.

[0023] Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the invention described herein. Such equivalents are intended to be encompassed by the following claims.