so my 05 impala is acting weird. heat wont come on when warming up, even if I let it warm up for 30 minutes or more as I tested it. once I start driving it would come on fine now it won’t come on at all and the temp gauge is all over place. will go from hot coolant temp to normal then 3/4 and back and forth. coolant reservoir was low but now it’s full when this happens and will go back to low once its cooled off.
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