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check your coolant level if it is low top it off. if it is full you may need to change your thermostat to get the temp back to normal. for the heat check the heater control valve to make sure it isn't stuck (heater control valve should be located against fire wall connected to heater hose.
Warm up the truck touch both heater hoses about midway in the hose . If one is hot the other cold you have no waterflow through the heater core. check the heater control valve it will be a valve in one of the heater hoses. usually cable or vacuum operated. make sure that valve is opening. if not, manually open it may be necessary to tie open to see if you have heat and if you get heat. If you do get heat determine wheather you need a new (control valve or cable or vacuum hoses. If you still have no heat chek the blend air door inside under the dash this is the door that changes the airflow direction from AC to heat it may not be working properly. Hope this helps.
If it has a heater control valve you can easily locate it. You will find it on one of the two hoses going to the heater core. Check to be sure it is opening. Also check to be sure you heater core is not plugged.