i have a 1990 tercel there is little or no heat im pretty sure its not the heater core i dont lose coolant. no other tell tale signs like smell or windows fogging. thermostat? or someone suggested maybe the valve that contorls the the amount of flow through the hearter core. when i looked it seemed to open and close fine when i moved the heater control maybe something internal in the valve? im going to change the thermostat and see how it goes. any other suggestions i would like to hear. thx all
oh and yes my coolant is topped up.I have a 1990 tercel there is little or no heat I'm pretty sure its not the heater core?It sounds like the heater core needs to be pulled and boiled out because it is clogged and not much water is running thru it. You can take the hoses at the block loose and try to flush water thru the lines. Try one side then the other to make sure it is clean. If not help then need to take core out of car and get it flushed or replaced.
There is also the control valve that allows water to flow thru the heater core. Is the cable connected? Does it change positions when you move the lever?
Do you have air coming out of your vents when the fan is on? Does the air speed change on different settings? If no air or little air then it could be that something is blocking your heater core and not allowing air to flow thru it.
The thermostat only allows water to enter the radiator so that is not the problem.I have a 1990 tercel there is little or no heat I'm pretty sure its not the heater core?try putting cardboard in front of the radiator. If it warms up then then it is definately your thermostat. Good luck and God bless.I have a 1990 tercel there is little or no heat I'm pretty sure its not the heater core?thermostat!I have a 1990 tercel there is little or no heat I'm pretty sure its not the heater core?Before changing the thermostat check the water temperature in the radiator to see if the thermostat is working. If it is not the heater core then the hot water is not getting to the heater core. Good luck and I hope you find the problem. There is not much to the heater system. It is just heater core and water.I have a 1990 tercel there is little or no heat I'm pretty sure its not the heater core?it is your heater core, not popped, but clogged. rust from parts inside your engine builds up and restricts coolant flow in heater core, its like its warm but over months it get cooler and cooler until it doesnt heat any more.
quick fix: find the coolant hoses that come from engine and into the firewall/heater core. disconnect hose, hook garden hose up and blow all the crap out backwards until water runs clear. hook back up, and make sure you have the right amount of coolant in it.
p.s. if your water pressure in your garden hose it to strong, it will pop a old heater core, so go slow
