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Inside the bonnet at the rear of the indicator light fitting is a steel ring. This is a clip-in spring fitting. Once unclipped the indicator unit slides out. The bulb is attached by a simple push on fitting.
The grab ring is what physically secures the tubing inside the fitting by biting into the tubing. The angle of the grab ring teeth causes the "bite" to be greater as the tube pressure or load increases, up to a point. At some point, the grab ring will usually bite off the tube or the grab ring will invert, allowing the tube to become disconnected.
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The "o" ring is a seal that is installed at each fitting. It prevents the refrigerant from leaking.
If you are talking about the quick disconnect style of fittings (no threaded connections) the fitting is removed by pushing on a circular ring around the tube at the fitting connection. You can buy a special plastic ring release tool from Harbor Freight or most auto part stores fairly cheap. The ring tool snaps around the metal transmission line, then slides up to connector fitting. By pushing on the fitting release ring, you are releasing the tension of the spring fingers on the ring, allowing the fitting to be pulled apart. It can be tricky, you may have to push the fitting together to allow the spring fingers to "un-bite" the connection while you are pushing the release ring at the same time. Once it releases, it comes apart so easy, you wonder why it looks so difficult to remove. Go check out a plumbing section at Home Depot and look at the "Sharkbite" style quick fittings--they are the same design and disconnect using the same principal.
Follow the hose from the top of the radiator to the metal fitting on the engine (should almost look like half a ball with a fitting the hose is attached to coming out at an angle). The thermostat is located under/between the fitting and the engine block. Drain coolant down several inches in radiator so it's below the level of the fitting. Remove hose/hose clamp from fitting, and 2 bolts from block. Seal SHOULD be a neoprene o-ring, so if it's in decent shape and not damaged/degraded, it can probably be reused, replace if unsure. Change thermostat, replace parts in reverse, and refill coolant in radiator.
The "o" ring is a seal that is installed at each fitting. It prevents the refrigerant from leaking.
the ring at the bottom ? replace it with a wax type they seal better, if its the one from the tank to bowl , shut water off remove tank bolts buy replacment kit, for tank,
Well if it's a captive bead ring (a ring with a bead on it) just push the bead out of the opening of the ring and roll the ring out of the piercing.
I have a '91 RS with a 2.2 4 cyl engine and came across the pcv valve by accident- it is inside of the valve cover. Look at the top of the valve cover on the passenger side. There will be a hose- one end goes to the intake manifold and the other to a plastic fitting (with a nut) on the vlave cover. Take off hose and unscrew plastic fitting. Fitting will have 3 prongs on it and a "O" ring. Take needle nose pliers and reach into the valve cover to pull out the pcv valve.There should also be a "O" ring on the pcv valve which holds it into place. Put "O" ring on new valve and push back in by hand- you will feel it "snap" in. Screw back in plastic fitting and connect hose.