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Not sure what the question is - but you have to have the compressor running to add freon. Most times if it is low you have to jumper the low pressure switch to make the compressor run long enough to add freon. Under normal conditions, low pressure should be 35-45psi and high side should be 200-300psi with the compressor and cooling fan running.
if its very hot out then this can be normal.make sure the cooling fans are working properly.it could be a thermostat that is not working properly,make sure the coolant level is full.if there is only say 2 lines then the hot line then you could have a head gasket that is just starting to go bad.
Check the cooling fans,they may not be running when the temp gets up to the 218 degree mark,they should come on by themselves,if not check the fluid level in the cooling system,and make sure the thermostat is not stuck shut,and bleed the air out of the cooling system,and last but not least,the coolant sensor could be the problem,if the cooling fans are good,and the cooling relay for the fans.
sounds like the gauge and sensor r workin properly....but you do have to address that coolant leak...that causes your temp to fluctuate cuz you cooling capacity is being reduced
First of all, it doesn't sound like your thermostat is working correctly to keep good hot/warm air coming , so I would change that, or have it changed for better heating inside. If you lift the hood & look in front of your radiator, On the engine side, you'll see a fan attached to, or in front of the radiator. It won't come on until the coolant temperature gauge gets up to proper operating temperature. Without getting in to too much detail, have your thermostat changed, and my guess is everything else will start working as it should, and whoever does the work, should know enough to check the fan operation when they do the thermostat.
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