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low operating temperatures is an indication of an air lock in the cooling system
gauges need the sender unit to be fully immersed in coolant to work but if they are not then the variable resistance material in the sender bulb cannot accurately relate to the coolant temperature
example if you have leak develop in a good system and you do not regularly scan your gauges like a good drive will do. it is possible that you will smell a dying engine yet when yo look at the gauge it will be reading cool to cold because the coolant has dropped to a point where the sender is no longer in contact with the coolant
USA answer, not in usa , ignore my post or post country? it can only be 3 problems, alldata.com covers the simple tests. 1: bad sender (if scan tool shows ECT reads right, its not this) 2: bad wires (conns) ECU/pcm to gauge. 3:bad gauge. see: factory FSM or alldata.com.
here is your type system, its no longer independent like in older years quote: The coolant temperature information is conveyed to the instrument panel,
through the PCM, from the Engine Coolant Temperature (ECT) gauge sending unit. To test the gauge sending unit, first test the gauge operation to make sure the problem is not in the gauge or gauge wiring. end quote.
my guess ? bad connection to I/P gauge cluster (rear) do this only after scanning (any scan tool works) the ECU OBD2 port to see if temperature is normal at the ECT but Guage lies. that is it. only testing wires an gauge, works from this point.
Make sure coolant level is full you can still have normal gauge readings but yet low or no heat if system is not totally full. Second- feel your heater hoses-are they both real hot? Is just one real hot and the other not? Do you have auto heat control or manual? Could also be plugged heater core, bad blend door motor, switch and etc.
You may have loaded a fuel line or connector up with contaminants. What else is happening during the second or 3rd day of running? Is it running low on fuel? Try to make a list of your gauge set! It only makes sense.
This sounds to me like your coolant temperature sensor/ sender is going bad allowing for your gauge to go all over the place. Also on these 87 - about 91 or so they had issues with the wiring shorting out. Basically the wires had no protection on them they would rub against the metal allowing for failure.
MOST CARS TEMPERATURE GAUGE STAY IN MIDDLE.THATS NORMAL.BUT IF THE TEMPERATURE GAUGE STARTING CLIMBING TOWARD HOT WHILE DRIVING YOU GOT A PROBLEMS.THE THERMOSTAT STICKING CLOSE.LOW COOLANT OR RESTRICTED RADIATOR.POOR AIR FLOW.GRILLE RESTRICTED.
broken fan belt water pump dont turn water dont circulate its gonna overheat alternator dont turn battery light stay on you said the bottle was full and when it cool down it was on low level that normal radiator took back what it was missing check the belt HOPE IT HELP FIXYA OUR POST THANKS PIERRE