my 1994 chrysler concord with a 3.3 engine reaches normal operating temperature but no heat comes out of heater. Temperature control calling for max heat. What could be wrong here. New thermostat, coolant system flush including the heater core and still no heat from heater
Country: United StatesMake: ChryslerModel: ConcordeYear: 1994Engine: 3.3liter
new engine thermostadt, coolant system flush,heater core flush.
The blend door accuator might be stuck in the cold position, you will want to do the following test.
What Happens Now?Your chat has ended, but you can still work with your Expert to get an answer to your question if you have not yet received one.Come back to this page at any time to see additional information from your Expert. You will also receive an email when your question is updated. If you want to send a message to your Expert, use the box below.If you have already received a satisfactory answer to your question, click the Accept button above. Experts are credited for each accepted answer they provide.
Jim, I can hear the blower air changing sounds when I move the heater temp from cold to hot so I think the blend door actuator is working. Is there a control valve controlling the coolant flow through the heater core? Ken
Try the following test.
The Automatic Temperature Control (ATC) system can be diagnosed two ways. The scan tool (DRB) can be used, or the vehicle's own control head display may be used.ENTERING DIAGNOSTIC MODE The control head can only be placed into the diagnostic mode while the engine is running and the vehicle is not moving. Set the control to a 75°F. setting (so there is no confusion with 23-36 Diagnostic Trouble Codes).
To place the system into it's diagnostic mode, press and hold the floor, mix and defrost buttons (at the same time). The ATC head display will begin to blink. When the control head display begins to blink release the floor, mix and defrost buttons. Once the control head enters diagnostic mode, the display on the control head will continue to blink. This occurs until it completes its tests and calibrations. Then it will display any diagnostic trouble codes that are present in the Body Control Module (BCM) . If there are no diagnostic trouble codes the system will return to its normal operation as indicated by temperature display.DIAGNOSTIC TROUBLE CODES
Diagnostic trouble codes related to the ATC system will appear on the display in numerical form. The diagnostic trouble codes are stored in the BCM and diagnostic trouble code numbers can range between 23 and 36. The control head can only show one diagnostic trouble code at a time. Under certain circumstances more than one diagnostic trouble code could be in the memory To scroll through any additional diagnostic trouble codes, press the panel button.
You never answered the question if there was a variable control valve which controls how much fluid flows through the heater core. Are you saying that the coolant flows through the heater core full throttle as soon as the water pump turns and the air temp from the heater is dependant on doors to the fresh air supply? Ken
This vehicle doesn't show a heater control valve. Run the test and see if you have any codes and let me know.
ASE Certified A6,A8,L1 and California Licensed Smog Technician