Question about 1999 Mercury Grand Marquis

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Automatic Temp Control

When I set my automatic temperature control, it will sometimes kick on and off. It still heats and cools.

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I believe that is how automatic temp control works once the desired temperature setting is reached it should shut off then maintain this temperature thus kicking on and off. Or is the problem that its not getting to the temperature you are requesting.

Posted on Aug 13, 2008

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When heat is on it blow hot ondrivers side and cold on ppassenger side.


Do you hear any clicking sounds coming from behind the instrument panel ? Electrically controlled actuators move temp . blend doors and they wear out .Plastic gears etc..
Electronic Automatic Temperature Control System
The electronic automatic temperature control (EATC) system operation is determined by the settings on the EATC module. The EATC system automatically maintains a selected temperature for vehicle interior comfort, including capabilities to maintain separate temperature settings for the driver and front passenger. The electronic temperature control capabilities are achieved by splitting the air distribution system internally and utilizing 2 individually operated temperature blend doors. The EATC system is composed of the EATC module, automatic temperature control (ATC) solenoid and manifold, blower motor speed control, 4 vacuum control motors, 2 temperature blend door actuators, in-car temperature sensor, ambient air temperature sensor and solar amplifier (sunload sensor) to control the various functions. Do you know about DTC'S - diagnostic trouble codes ?

The electronic automatic temperature control (EATC) system must be diagnosed by first retrieving any DTCs, if present.
  • An on-demand (hard fault) DTC indicates that the fault is currently present. An on-demand DTC suggests a wiring fault, disconnected connector or component failure.
  • A continuous (intermittent) DTC alone (corresponding on-demand DTC is not present) indicates that the fault is an intermittent condition and may not be currently present. A continuous only DTC suggests a poor wiring connection, loose pin or terminal or intermittent component failure.
On-demand (hard fault) or continuous (intermittent fault) DTCs can be retrieved using a diagnostic tool. If using a diagnostic tool, refer to the diagnostic tool operating manual.
On-demand DTCs can also be retrieved by carrying out the Electronic Automatic Temperature Control Module On-Demand Self Test. To retrieve and/or clear continuous DTCs carry out the Electronic Automatic Temperature Control Module - Retrieve Continuous DTCs procedure. Always carry out the Electronic Automatic Temperature Control Module On-Demand Self Test before retrieving continuous DTCs.
If no DTCs are present, GO to Symptom Chart for the appropriate diagnostic action.

DTC EATC DTC Displayed Notes Description Action to Take B2266 2266 N/A LH Blend Door Failure or Short Go To Pinpoint Test A . B2267 2267 EATC Only RH Blend Door Failure or Short Go To Pinpoint Test A .
  • The dual temperature control is inoperative/does not operate correctly - Dual Zone EATC
  • Temperature blend door/actuator broken/binding
  • EATC module
  • CHECK the temperature blend doors/actuators for a binding or broken condition. If no condition is found, INSTALL a new EATC module. REFER to Section 412-01 . TEST the system for normal

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Heat temp gauge on motor if faulty can it effect the cooling temp of the air conditioning on a saab 93 convertible 2002 model


No. The engine temp sensor affects engine idle speed, and timing. There is an in car temp sensor that controls the position of the blend door and the fan speed if the system has automatic temperature control.It also cycles the AC compressor clutch and the radiator cooling fans.

Dec 22, 2016 | 2002 Saab 9-5

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1999 ford expedition , runs good doesn't overheat , but puts out no heat ?


heater core might need replaced . check the hoses going to it under the hood after it gets to operating temperature .One should be hot and the other not so much

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Air blowing cool on passenger side warm on driver side how to fix this


sounds like you have a temp door motor problem on the drivers side. the motors seize/stick and have to be replaced.

Aug 09, 2015 | 2005 Buick LeSabre

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Why is my AC compressor running when my temperature control is set to heat, fan control set to 2, AC control switch off and air flow control set for floor?


If you have an automatic climate system where you can set temp the the compressor will run at some of the middle settings. The system blends cold and warm air to obtain the desired temp setting. If it does not have automatic control you have another issue.

Oct 23, 2014 | 2003 Mitsubishi Galant

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Automatic temperature control it's bad burn on me, I order a used "ATC" automatic temperature control and still doesn't work check the fuses and relays still doesn't work


There should be some kind of valve that controlls the actual amount of coolant running through the heater core and there for controlls the temp. There may also be a door that might be stuck that controlls the amount of air traveling through the heater core.

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Cannot adjust temperature on the heat & air, 2000 grand marquis, cannot get any heat, air cond temperature cannot be adjusted, it stays on cold at all times


Is this an automatic temp. control or manual heater control? if it's automatic control,it can be an expensive circuit board which has gone bad. don-ohio

Oct 22, 2011 | 2000 Mercury Grand Marquis

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NO HEAT,BUT BLOWER FAN WORKS POSSSIBLE THERMOSTAT GOING OUT


Hello: Check the temperature door. Make sure it is in the heat position. The temp door should be on the passenger side under the dash, remove the cover and with key on move the temp control from heat to cool. If the temp control is manual there will be a cable that is connected to the arm that moves the door. If the system is automatic there will be a electric actuator that moves the door.

Oct 03, 2011 | 1998 Buick Century

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Hot air blows when system turned to heat, when control is moved to Defraost or combination heat/defrost air temp cools down, what could cause this?


Make sure you have the heat selection set all the way to heat. In Ford and Dodge vehicles, when you select Defrost the AC compressor actually kicks in and if you have the temperature selection set to the cool side it will push cold air to defrost your windshield.

Oct 09, 2010 | 1998 Ford Taurus

1 Answer

The ac compressor runs and cools properly when temp is cool,but on warmer days it will run then kick out and will not kick back in for several hours later.All pressures are good...the freon charge is...


What year is the vehicle ? The A/C button on the control panel is a direct input to the PCM /ECM - engine computer . The PCM/ECM energizes the compressor clutch relay to engage the compressor .

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