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Direct answers to your questions:
1. The temperature of the water in the system has not risen at all and still sticks with the temp gauge needle just above the first, lower marking.
Between first white mark and center mark
2. At this point, the fans come on, which strikes me as too early.
No, if fans are coming on and AC system is off, that's good.
SO, here are my questions for those willing to reply.
- Where should the needle be for normal operating temp for the engine? Midway?
- With the needle just above the lower marking, could we assume this is only warm and not enough for hot air to blow through into the car?
No, your heater valve may not be opening, or your heater system has some other problem.
- How common is it for thermostatic switches to come on too early?
Pretty rare.
- Can one be changed without removing the radiator?
Yes.
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