0
If the system is blowing hot air all the time - no temperature control at all, it's likely the blend door is stuck in the hot position.
See "Related Questions" below for more about troubleshooting blend door problems.
If the system is blowing hot air all the time with the fan on high, it is most likely a vacuum problem. In doing a lot of searching, and swearing, I found out that the system has a "Failsafe" mode so if there is a vacuum problem, the operator wouldn't lose the ability to see out of the windshield in cold weather. Check for a vacuum leak under the hood. It could be causing your heater/defrost to go into this mode.
What else can I help you with?
2002 Mercury Sable paint code?
what its the paint code for 2002 mercury sable
Where is the radiator on a 2002 Mercury sable?
On a 2002 Mercury Sable the radiator is at the front of the engine compartment
2002 Mercury Sable autolamp sensor?
My auto lamp light sensor is not working on my Mercury Sable 2002. Why?
What is the gas tank size of a 2002 Mercury Sable?
For a 2002 Mercury Sable : ( 68.1 litres / 18.0 U.S. gallons )
How many lugnuts on a 2002 Mercury Sable?
On a 2002 Mercury Sable : Each wheel has ( 5 ) lugnuts / total of 20
How many gallons does the gas tank hold on 2002 Mercury Sable?
According to the 2002 Mercury Sable Owner Guide : ( 18.0 U.S. gallons )
How do you remove a shift knob from a Mercury Sable?
2002
What gas is best for 2002 Mercury Sable?
For a 2002 Mercury Sable : " regular " unleaded gasoline , 87 octane For the 3.0 liter " Vulcan " and " Duratec " V6 engines
Where is the radiator cap in a 2002 Mercury Sable?
On a 2002 Mercury Sable : The thread on cap on your engine coolant reservoir is the 16 PSI pressure cap / radiator cap
How many gallon gas tank is on 2002 Mercury Sable GS?
According to the 2002 Mercury Sable Owner Guide : For all trim levels ( 18.0 U.S. gallons )
What size is the axle nut on a 2002 Mercury Sable?
30mm
Oil type for 2002 Mercury Sable?
SAE 5w20
