Heat only blows hot when accelerating

I'm thinking your engine coolant level is low. Top it up with the proper 50/50 mix. Your heater is at the highest level of the cooling system. Tthat's where air bubbles collect until you rev up the engine and hot coolant once again circulates.

I'm going to try that, and see what it does. One can ONLY pray for a simple fix. Thank you!! If not, I'll be back..lol to pick more brains..

Always be careful topping up radiator on a warm/hot engine. Do it while cold if you can. And also fill the coolant overflow bottle to the "full/hot" mark. This bottle tops up the radiator while the engine gets cold, parked overnight, if the radiator cap ($5) is working right. This engine you have, has a reputation of mysteriously loosing coolant through the engine gaskets....about a gallon a year. Not to worry, just keep it topped up.