Question about 2000 Ford Taurus

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How can I tell if my heating problem is the thermistate and not the heater core?

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The simplest way to tell if you got a thermostat problem is to take note of the temperature gauge , if you have owned the car for awhile you should know were the temperature gauge normally runs when the car is warmed up, it should be running in the same place on the gauge, if its running much lower its a good indication that you have a thermostat problem, if you have serviced the cooling system every 30,000 miles or so you should not have a bad core but it is still possible, these cars do have problems with the blend door motor or blend door its self , you can tell if this is possibly the problem if you warm up the car (this is only if the temp gauge shows its running at a normal temperature)then turn the temperature knob on the dash from the coldest point to the highest hot while holding your hand over air flow outlet you should notice a very noticeable change in temperature when moving from hot to cold if not that"s a good indication that you have a blend door or blend door motor problem.if you have a blend door or blend door motor problem problem you mite want to take it to a shop because to repair it requires complete removal of the dash assemble to gain access to the heater box, also I should tel you that if you can get to the heater hoses ( under the hood ) were they enter into the car , make note of the temperature, they should both be pretty much the same temperature, good and hot to the touch,if not its very likely you have a plugged heater core,(as long as at least one hose is good and hot) which again requires removal of the dash board to access, this should get you headed in the right direction to figure out were the problem is

Posted on Dec 29, 2010

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The easiest way to determine whether or not your thermostat is working is someone will have to remove it. Take it into the kitchen, place it in water and turn on the burner. if the thermostat is working it will open once the water gets hot enough.


Posted on Dec 29, 2010


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Just changed my hoses out on my 2003 chevy malibu, now the air is blowing real well but only cold. It will not blow hot air and it is causing the check engine light to come on. Any thoughts

check your heater core in the center behind radio under dashboard sounds like no circulation from radiatorto core that gives heat nothing electric and also check your thermistate comingfrom the radiator hose connected to your engineblock

Jan 26, 2013 | 2003 Chevrolet Malibu

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In my ford econoline my heater is not working .i replsce the heater core, termostat,tempsensor, heater relay,heater valve and it still not blowing any heat please tell me what the problem could be.

have you checked the heater tap as in when you turn to hot on the dash the tap opens and allows the heated water to pass thru you rheater core?

Dec 31, 2010 | 1998 Ford Econoline

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I believe its the thermastat but I will tell you what my problem is so I can get the proper analysis. I have absolutely NO heat at all. Trying the thermastat replacement is the first thing I should do...

i wish you luck but is the temp staying in the usual place on the meter... could be as simple as a heater coil. or maybe the electronic control is not changing to flow water to heater core.. check engine light on?: turn heat on off on off on off to try to get it to change flow.. good luck

Dec 10, 2010 | 1996 Audi A4

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No heat.. fan works heater core hoses hot thermistate ...


Feb 13, 2010 | 1999 Nissan Pathfinder

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My heater is blowing out cold air, i changed the thermistate and had it if flused out. The hot water from the heater core is going in but not coming back out.

Yeah you probley have air in the coolent system try letting it run untill the temp is about 195 degrees and then cut it off lwt the water **** down and out mor in and do it over untill you got heat

Jan 09, 2010 | 1998 Chevrolet S-10 Pickup

1 Answer

95 cavalier / no heat have antifreeze in drivers floor

This would be a indivcation thatyour heater core is leaking or that the hoses that are attached to the heater core is leaking
I would first inspect the hoses that go to the heater core and then remove the cover for the heater core this has a seam in the middle of the box that covers the heater core just use a very sharp knife and gently cut along the seam and remove the cover now you will be able to see the heater core and you will be able to tell if the heater core is leaking or if it is just the hose that is attached to it ok?
I hope this is very helpful for you
Best regards Michael

Dec 26, 2009 | 1995 Chevrolet Cavalier

1 Answer

Heater problem

I would check the oil for coolant then more than likely be your heater core

Feb 15, 2009 | 1996 Chevrolet Cavalier

1 Answer

The heat system is broken


You haven't said what is actually wrong with the heat system (there can be several different failures). For the time being I'll assume the fan blows plenty of air but the air is always cool/cold regardless of where the heat temperature selector is positioned.

The most common cause on these cars is a plugged heater core. With the engine at normal operating temperature, feel the heater core hoses (under-hood, mid/lower portion of firewall, access from passengers side). They should both be very warm. If not expect blockage in the heater core.

While a replacement heater core along with a good cooling system flush is the ultimate cure, reverse flushing the heater core will restore heat. This can be accomplished with a garden hose. Disconnect both heater core hoses (not with the engine hot as the coolant get very hot!!) and connect a garden hose. Turn on the water supply to flush the core. Flush the core in both directions (by hooking the hose to one side of the heater core and letting the water run, then disconnecting and connecting to other side of the heater core...). An old garden hose with end cut will work fine if your existing hose will not fit over the pipe (plumb it together anyway you can).

The heater core sits rather low in the cooling system. This means crud in the system will settle there eventually causing blockage. If you flush the core the crud will eventually cause blockage again. Reflushing will work over and over again if saving money is the primary goal.

If this is not the problem, the blend air door is probably not working.

Reply and we'll continue. I don't want to repeat things that have already been done, as $2000 should of covered both things I have mentioned.

Nov 19, 2008 | 1999 Ford Taurus

2 Answers

98 jeep wrangler no heat

Try this disconnect the heater hoses from the heater core use a hose to backflush the core. Then reconnect and try again.

Oct 18, 2008 | 1998 Jeep Wrangler

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