Do I need to change thermostat and about how much does it cost for the labor and the new thermostat
Are you sure there are no air pockets in the cooling system ?
You should have heat anytime the engine temp is above 140 degrees regardless what the thermostat is doing.
A very simple problem for an old was fixed with very little cost. The coolant in radiator and the overflow was very low. A very simple problem that was over looked. Filled them and heater works fine. Can't believe I over looked checking the coolant.
Good to hear. I will say you should check the system for leaks since you should not need to add coolant under normal conditions.
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SOURCE: 2000 Lincoln Ls Heater blowing cool air
You also could have air in your coolant system. You can't just add coolant on these models after you drain the system or let it run low on coolant. The degas bottles on these models also have a flaw, where they crack along a seam. Sometimes coolant will leak, sometimes not, depending on how high the crack is on the bottle. But what it is guaranteed to do is allow air into your system, which can cause havoc with overheating (air surrounds the thermostat so it doesn't open) and keep coolant from flowing, particularly through the highest point in the system: the heater core. There is a heater core bleeder valve attached to a line near the top of the degas bottle (next to the expension line up top) with a plastic, flathead srewdriver face. Turn the heat on high and run the system at idle for 5 minutes. Then open the valve and keep it open until a steady stream of coolant comes out. (It's like bleeding your brakes.) That will clear any air from the system and at least give you peace of mind that this is not your problem. Then run the motor at 2000 rpms, with the heat still on high, for about 5 minutes or until hot air starts coming out. Release the bleeder valve again until a steady stream comes out. Then let the system cool and check your coolant level and fill as needed. I'd pull the degas bottle and inspect it...should have been a recall.
SOURCE: Heater blows cool air & never heats up.
I changed the thermostat. It works like a charm now!!
SOURCE: heater doesn't blow warm air. Not the thermostat
Sounds like either the valve which lets water into the heater core is not working properly or the vacuum operated door which directs blower motor air over the heater core is not opening, Could be a vacuum hose loose or it has a hole in it.
If you want to further discuss, let me know,
SOURCE: 2000 Xterra intermentantly overheats
sounds more like the thermostat may be failing. generally a water pump starts leaking out of the "weep" hole in the casting before it quits. just look at the front of the water pump for a greenish streak or an obvious leak.
if you also suspect you heater core may be getting plugged now would be a good time to back flush it to get rid of some of the gunk.
SOURCE: Heater not working, had thermostat replaced no
My 87 Celica had the same problem and it was the solder connections on the back of the heater control panel.
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