Question about 1995 Ford Mustang

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Temp gage goes up to top of scale, before red. Doesn't go into red. Then will go down to 1/2 way for awhile and the repeats.Took out old thermostat, coolant is at proper level.

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Faulty gauge or Faulty Temp Sensor. Replace the Sensor and if this doesn't resolve the problem replace the gauge.

Posted on Jul 22, 2010

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My temperature gage is not reading on my 88 suzuki samurai

the book covers this sensor and guage 100%
the gauge sensors is 1 pin, the other is for ECU car, seems your car is not stock, or had A/C at one time. there are 3 sensors. for water temp on some fully opted cars, ECU, gauge, and A/C.
88 had no ECU. its a carb but who knows what engine is there, its old.
the guages is just 3 simple parts
a gage, a wire and a sender (sensor)
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if not its bad.
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Is it boiling over or do you have a bad temp gage. An easy check of the thermostat: When the engine is hot, does the heater put out heated air. If it does, then check the fan if it's electric. If it doesn't, change the thermostat.

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Temp gage normal warms up and then goes red for a few seconds

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Try replacing your thermostat. I haven't had to replace one in years, but I remember it being a cheap and easy job. It should be located where your upper radiator hose meets the engine. You should only need a screwdriver to loosen the hose clamp and the same screwdriver to pry the old thermostat out. Be sure to let the engine cool off first!!!
This link explains how they work.

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I think you started out looking in the right places. Replacing the coolant, thermostat, relay and sensor are all fairly inexpensive.

I believe you either have blockage in the system (especially if you're using tapwater), or your water pump may be failing.

I would first either take it to a radiator shop and have them flush the cooling system out thoroughly, or else pick up a chemical flush kit and do it yourself. This involves more than just drain and refill.

If this doesn't work, your next step will probably be replacing the water pump. At almost 200k miles, it's probably about due anyway.

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If cooling fan works, it maybe a sticking thermostat not opening fully. Check that cooling system is full (check cold) first. Then if that seems ok, i would replace the thermostat.

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Go the Cheaper Route First and Go back to the Parts store and ask for a Cooler Thermostat. Try that and let me know what you have got.

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