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Re: 1994 Ford taurus overheating, no heat...
When you replaced all of that stuff on the vehicle did you make sure that you don't have a vapor lock in the highest anti-freeze line? to fix run vehicle with line disconnected so air can escape then reconnect. if that dont work you will need to put a T splice in the top anti-freeze line so when the vehicle is running you can open the valve and let air out.
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First The heading says 99 Taurus but the question says 99 f-150. Second, are you saying that the engine is overheating? The heater won't work if the level of coolant is low and that would explain overheating. The thermostat controls the temp of the heat, so if it is stuck closed then water can't circulate to the heater and the vehicle would overheat, but this is unlikely.
the other answers seem to concentrate on a non-working heater. Good luck with this problem.
check that you put the thermostat in the right way. Body into the water and not the hose. Check that the fan circuit is operational with the fuses and relays operating normally. If it is an auto check the temperature of the transmission oil as it is cooled by the radiator and that will make the car run hot if the oil is over heating from a transmission fault.
Good point. Solving it will probably take more time than money.
Thermostats and heater cores do not work one day and stop the next. If your engine warms up normally and doesn't overheat, the gauge reads normally, engine is at normal operating temperature after about 10-15 minutes ...all these point to a good thermostat. It is working right and should not be a problem.
To check the heater core, wait till engine is at normal operating temperature. Turn heat setting to high, then feel both heater hoses-both should be hot. If both are hot the core is circulating coolant and is not a problem. If only one is hot (which would be the inlet hose) the core is not circulating-could be an air block or the core is plugged up and will need replacing.
If heater core and thermostat are good, then it probably is the temperature blend door in the heater case. The door actuator is probably vacuum controlled. I don't know how difficult it is to troubleshoot on your Taurus, but check if vacuum controls are working right from the dash controls, check if the blend door is stuck, is broken, or if the vacuum control is working to open and close the blend door. When you want heat, the blend door should let blower air pass across the heater core.
From the engine you will have a single vacuum hose that goes through the firewall into the dash to the heater/AC controls. There, a pod like device can rout the vacuum signal to various doors on the heater case.
does the heater work good, like real HOT when the truck is HOT? if not, flush the heater core with a water hose, both directions. Now when the truck is HOT open the hood and feel the air coming thorough the radiator, it should be HOT. if its not, the radiator may be plugged. If the mechanic has a Temp Gun, have him check the radiator temp, it should be uniformly HOT if you find cold spots (like if the radiator is 200f and there are places that are 150f) the radiator is plugged and "flushing" will do nothing.
You will need to see if the fan operates when overheating, there are diffrent sensors for the cooling and ac cooling, the good thing is that the fan works, this would tell me it may be a bad coolant temp sensor or thermostat, you will need to let it run and as the gauge passes the middle point feel to see if both upper and lower rad hoses are hot, if only one is hot then you may have a bad thermostat, is they are both hot and fan doesnt turn on and car overheats then you should replace the coolant temp sensor, stat with these tests and see the result, hope this helps.
the thermostat can be easily changed from up top, the T-stat is located at the engine end of the upper radiator hose under the flange the hose connects to. Make sure u follow manufacturer's cooling system bleeding procedures when you refill after the T-stat is changed out.
Thermostat is faulty.
It can be found by grabbing the top radiator hose and following back to the engine. The housing this hose is clamped to is the thermostat housing. Remove the 2 bolts, and the cover o reveal the thermostat.
It should cost less than $20 for a thermostat and gasket.
Replace it and your overheating isues will go away.
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