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Heater control won't change from ac to heat

Heater control won't change from cool to heat. 2000 merc sable

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Replace heater control switch in dash. good luck.

Posted on Jul 18, 2009

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2000 envoy my heat was working but it made a loud whistling noise now it wont comeon at all hodo u tighten hose


Not an easy fix - sounds like either a heater/AC plenum control diaphragm started leaking, or a vacuum hose to one of them has popped off at the actuator or at the heater control, or the vacuum line developed a leak somewhere between an actuator and the heater control or the engine. You can try to pin down by checking airflow out of the defroster, ac and heater vents - if airflow is normal in each position, the problem is probably the heat/cool control actuator, the line from it to the heater control, or the heater control itself.

Nov 20, 2014 | 2000 GMC Envoy

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2000 ford taurus heater not working. What can be wrong?


It sounds very much like the heater control door (inside the heater box) is sticking in one position or the other. It's intended to direct air through either the AC's evaporator or the heater core, depending upon whether you want heat or cooling.

Assuming (highly likely) that the control door is vacuum-operated, you may have a vacuum leak anywhere from the engine to the heater box inside the passenger compartment, via the heater control unit.

Nov 18, 2014 | 2000 Ford Taurus

1 Answer

2001 Mercury Sable 3.0 v6 heating problem had a flush done and changed the thermostat put new coolant in, replaced heater core, replaced blend door what else can it be


First make sure you dont have an air lock in your heater core and make sure you feel heat from the two heater hoses if you do fell heat your problem is under dash. If the hoses are not hot you have a blockage some where you may have a heater valve not operating it works by vaccum if u have AC look in the engine compartment or it maybe under the dash by heater core, I belive its in engine bay by Ac and heater boxes

Joe

Oct 08, 2012 | 2001 Mercury Sable

1 Answer

How do i take the dash board off my 1999 mercury sable


Hi...i have a 99 Sable..my heat temp only stays on 90...even if the controller is set at 65...the temp always is 90... how do i remove the dashboard to get to the heater/ac controls???

thanks
Michelle

Dec 28, 2010 | 1999 Mercury Sable

1 Answer

I have a 1999 merc sable that will not blow hot air. A/C works fine. Replaced the Radio, Heater, A/C control panel with no help. i think it is the heater control valve but have no idea where it is. The...


acuator is undrer dash behind glove compartment. Be sure your coolent level is full . does it blow warm air on long trips and does the car come halfway up the gague when running if not change thermistat if that is not your problem check vacume line going to actuator (changes positions heat defrost and vent) make sure heat control is hooked up if none of the above are the problem replace blocked heater core please check box below if helpful

Nov 27, 2010 | 1999 Mercury Sable

1 Answer

My 2001 sable blows cool air no heat,can you help???need heat


There are baffles in the heater box that switch from AC to Heat - could be stuck in the AC position.

Nov 27, 2010 | 2001 Mercury Sable

1 Answer

Am coming out of summer going n2 fall..when turnin air from ac to heat it still blows cold...plz help....


Take the hoses off of the heater core (firewall) and flush the clogged little "radiator" inside your cab. You may need to pour radiator flush fluid directly into it since the Merc. has bypass WYE pipes that do not direct the flow through the heater core if it becomes blocked. The hose clamps are a bugger to get to as Ford never expected anyone to have to WORK on the car when they assembled it at the factory. Avoid damaging the sensors at the top of the intake (DPFE).

Oct 20, 2010 | 2000 Mercury Sable

1 Answer

1995 merc sable,changed radiator thermostate, but the heater will not blow warm air.sometimes it will get a little warm but as soon as you turn ion the faqn its cold.


you might need to change the heater core...
i don't believe that the radiator thermostat has to do anything with the heater...

Oct 12, 2010 | 1995 Mercury Sable

1 Answer

I have a 2002 Mercury Sable 3.0. I noticed when


The clicking noise is the motor for the "blend door". The heater core and the air conditioning side share the same ducting. When you move the knob a small motor moves the door letting the respective hot or cool flow happen.
The heater core is probably blocked. The engineers at Ford have the coolant hoses bypassing the core with a WYE at the firewall. The coolant takes the path of least resistance and stops FLUSHING the heater core and it eventually clogs.

Oct 12, 2009 | 2001 Mercury Sable

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