the alarm is for engine overheat perhaps the coolant level is low or not circulating check level 1st then check for a blocked airflow through the radiator or the thermostat maybe faulty
PSA cars with analog instrument clusters have the STOP light to alert drivers of irregularities in engine temperature or coolant that may cause severe damage to the engine. Check your radiator coolant level and top up when it's low. Don't forget to bleed the air from the cooling system. If problem persist, check for loose connectors to the Coolant Temperature Sensor(mounted on the cylinder head) and the Coolant Level Sensor (mounted on the side of the coolant refill tank). For the alarm, check ALL door switches including those for the front hood and the rear trunk. They may be shorted to earth or one of the door becomes ajar. Next time the alarm triggers, check which door looked like it's slightly opened. If so, realign the door hook located in the door pillar.
I WOULD CHECK BOTH RADIATOR HOSES TO MAKE SURE THEY ARE HOT. THERMOSTAT COULD BE STICKING SLIGHTLY CLOSED.CHECK COOLANT LEVEL MAKE SURE COOLANT NOT LOW.IF COOLING NOT BOILING OUT OF THE EXPANSION TANK. I WOULD HAVE CAR HOOKED UP TO A DIAGNOTIC SCANNER AND CHECK COOLANT TEMPERATURE SEE IF TEMP. OVER 230 DEGREES IF SO RADIATOR COOLING FANS NOT WORKING.COOLANT THERMO SWITCH BAD BOTH FANS SHOULD BE RUNNING AT LOW SPEED.IF ALL LOOKS GOOD YOU COULD HAVE FAULTY LOW COOLANT SENSOR IN EXPANSION TANK.MAKE SURE COOLANT IS IN THE EXPANSION TANK BECAUSE COOLANT LEVEL COULD BE LOW.ADD COOLANT IN THE EXPANSION TANK UNTIL YOU AT MAX LEVEL LINE ON THE EXPANSION TANK.DONT OVER FILL THE EXPANSION KEEP ADDING COOLANT UNTIL COOLANT LEVEL STAYS AT THE MAX LEVEL LINE ON THE EXPANSION TANK.
The best way I can describe the warning is that it looks like a circus tent. This light represents the coolant level. If your coolant level sensor detects a lack of coolant, it will come on. I would advise filling your car to the proper level and also have a mechanic inspect your cooling system to find out why your coolant level dropped. Two other things to check are if you have any electrical current in your coolant, which can cause a false alarm, and secondly, that the sensor is not malfunctioning. Just a thought.
This same thing happened to mine. It only happened in really cold weather though. I added a few inches more of coolant into the overflow. It fixed the problem. I also discovered if that is not the problem, the sensor in the overflow can go out and a replacement is about 20 bucks.
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