Heating Problem
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New User
Joined: Dec 2009
Posts: 14
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Heating Problem
1998 Explorer heater will not get hot. The blower is working well. Everything is electronic. Would someone please give some advice? Numbers on digital display go up and down, however setting in warmest position does not make a difference in heating inside of vehicle.
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
if water level is o.k, hoses are hot, thermostat (temp gauge needle) is in the 40% range on the gauge, then you probably have a broken mixing door arm. hot and cold air are mixed to get the temp you want. the heat **** controls the electric motor drive for the door. Im not sure about the "digital display", if you have an Eddie Bower type vehicle with electronic- dual temp controls-- it can be the controller.
Logistics Pro
Joined: Jun 2009
Posts: 4,819
Likes: 83
From: Cedar Rapids, IA
See if the following yields any codes:
(Pasted from the factory service manual)
Electronic Automatic Temperature Control Module Self-Test
-Rod
(Pasted from the factory service manual)
Electronic Automatic Temperature Control Module Self-Test
- The EATC module self-test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A NGS tester must be used to retrieve these concerns.
- The EATC module self-test will detect concerns in the system control functions and will display hard diagnostic trouble codes (DTC) in addition to intermittent diagnostic trouble codes for concerns that occur during system operation. The vehicle interior temperature should be between 4º-32ºC (40-90ºF) when performing the self-test. If the temperatures are not within the specified ranges, false in-car temperature sensor DTCs will be displayed.
- The self-test can be initiated at any time. Normal operation of the system stops when the self-test is activated.
- To enter the self-test, press the OFF and FLOOR buttons simultaneously and then press the AUTOMATIC button within two seconds. The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds. Record all DTCs displayed.
- If any DTCs appear during the self-test, follow the diagnostics procedure given under ACTION for each DTC given.
- If a condition exists but no DTCs appear during the self-test, refer to the Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Improper Operation.
- To exit self-test and retain all intermittent DTCs, push the blue (cooler) button. The control will exit self-test, retain all intermittent diagnostic trouble codes and then turn OFF (display blank).
- To exit self-test and clear all diagnostic trouble codes, press the DEFROST button. The vacuum fluorescent display window will show 888 and all function symbols for one second. Then, the EATC control assembly will turn OFF (display blank) and all DTCs will be cleared.
- Always exit the self-test before powering the system down (system turned OFF).
- Intermittent DTCs will be deleted after 80 ignition switch ON cycles after the intermittent condition occurs.
-Rod
