Part of this issue is a quirk of the earlier WBX wiring (mine is a '83.5 and did the same thing): when the "empty" sensor in the top of the expansion tank (the one in the rear left of the engine room) is out of contact with coolant it not only makes the light flash (and it should falsh when the key is first turned, its the test circuit), it also pegs the temperature needle, no matter what the temperature actually is. From what you describe, I would bet the cap is bad, and as the engine heats you are loosing coolant somewhere other than the fill tank, but when it wants to draw coolant out of the fill tank it cannot, and sucks air from somewhere else. |
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