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Look at the LOW
pressure gauge reading when the engine is OFF.
On an 80 degree day, the
LOW gauge should read about 56 psi or higher if the A/C system contains
an adequate charge of refrigerant. On a 90 degree day, the LOW side
reading should be about 70 psi or higher. If the LOW gauge reading is
less than this, the A/C system probably needs some additional
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That vehicle has two coolant temp sensors on it, both are on the passengers side of the end of the head, where the thermostat housing is. One has a two wire plug, this one tells your fans to come on the other is one single pin, this one is for your temp gauge. This sensor works off resistance, the higher the resistance the higher the gauge in the car goes. This sensor has probably grounded out and pegged your gauge in the car. Replace that sensor and you should be good to good, not too expensive either. Good luck.
If the temp gauge is reading normal, the lights are flashing, and the coolant level is full, the level sensor in the coolant bottle is the problem. I'm a service consultant for a Saturn dealer and I've run across this many times.
hi from uk from your symptoms of what happened re temp guage risen suddenly it would indicate the temp sender unit on the engine has blown ie is earthing to engine via its screwthreaded body this is just a matter of replacing with a new sender unit hope this helps
The car is not overheating if the temp gauge goes up and down by turning the lights on and off. The gauge is giving you bad information. You can confirm this by starting the car from cold, sitting in the driveway, let the temp go to somewhere BEFORE normal operating temp, then turn on headlights and fan blower on high, watch the gauge, then turn them off. If the gauge moves significantly from the electrical load, you probably have a short or a bad ground connection.
You have a short circuit or bad wiring somewhere in the front half of the car. I don't know what thermostat switch you have replaced ... but it's not the problem .. stop buying them. If you are the original owner, was there an accident that may have damaged some wiring? If you bought the car second hand, get a carfax and find out where the thing was hit ... concentrate your wiring trouble shooting in that area.
I think it is something OTHER than the temperature sending unit or the gauge