Changed thermastats 4 times no changed. block off hose which most 1990 models dont even have we have heat but temp gauge goes haywire! never actually left it overheat. help it is below 0 here and I have a 2 year old I am a GM mechanic (well USED to be)not a ford mechanic
Re: I have VERY little heat in my 1990 ford taurus
I had air pocket in cooling system so i got a radiator air bleeder. It`s a radiator cap with a funnel have the car running and keep the heat on full blast and keep antifreeze in the funnel but it will overflow a few time before while air is released. you know you are done when the level stay`s at one point of the funnel. Good luck
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common problem is the water resivor cracks up at the bottom... it appears that your water level is fine because the car doesnt over heat but i am willing to bet that resivor doesnt have water to the top. The radiator will hold just enough water to keep it cool. I replaced mine 3 times the sulution is doing to sound weird but go to the junk yard and get one off a murcury sable. dont know why but the sables res doesnt crack like that
i would probably try and flush out the heater core, it may be plugged up, to do this there are two heter hoses that go into the firewall at the back of the motor, remove those and use a garden hose to back flush it. If nothing comes out try a rad flush solution and let it sit inside the heater core for 10-15 minutes and then try to flush it again
You have an air lock in the cooling system.
Do this: pull upper radiator hose off the radiator leaving it connected to the block, pour coolant into hose until filled ( you might have to do it to the radiator also). Once filled reconnected hose back to the radiator, then fill resevior to proper level. Start car turn heater on full. Let car run with cap off resevior until it starts pulling coolant in. Once warmed up shut car off let cool. Check fluid level again.
I would have to assume that the water has heated up,, but there is also a valve in the heater hose, at the firewall that opens when you turn the temp knob. if the hose going to the firewall is hot, and you are not getting heat inside, the valve is not opening. It can be mechanical or electrical. Not sure about yours.
recommend replacing coolant reservior cap also start car let it get to tempature put on glove and squeeze the upper radiatior hose together and if real weak and does not open up in your hand the water pump maybe weak but before you do all this check the condition of the drive belt because if the belt is slipping you will loose circulation in the coolant system and if there is a salvage yard near you or if it is not very expensive have you changed the temp sensor with the little wire on it not far from the thermastat housing