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Sound like you need to check the coolant level first, when the heater goes cold when it should be hot is a good indication your low on coolant which means you have a leak somewhere in that system, get it looked at real soon, you don't want to overheat the engine and blow a head gasket.
go to an auto parts store and get an electcic dipstick heater . remove your oil dipstick after parking car for the night.install electric dipstick preferrably while engine is still hot plug it in at night .this will
help keep the oil warm and also the block after car starts unplug heater remove it and install original dipstick. this is the easiest to install but there are also block heaters