QuestionQUESTION: i have a 2000 chrysler lhs and it only blows cold air through the heating system. any ideas.
ANSWER: Hi Michael,
What model of Chrysler do you have and does it have conventional or digital readout sort of controls? Does the temperature reading on the dash gauge read at least 1/3 scale after warmed up?
Roland
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QUESTION: model is LHS and has digital readout. temp is one third.
ANSWER: Hi Michael.
That system has a self-diagnostic capability which gives two-digit codes for various problems. Here is how to do the code readout:
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 the 23-51 Diagnostic Trouble Codes (DTC's)
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. Release the Floor, Mix and Defrost buttons. Once the control head enters the diagnostic mode, the display on the control head will continue to blink. This occurs until it completes its tests and climate control unit door/actuator calibrations. Then it will display any diagnostic trouble codes that are present in the BCM. If there are no diagnostic trouble codes, the system will return to its normal operation as indicated by the temperature symbol (a C or a F) Diagnostic trouble codes related to the ATC and climate control unit will appear on the display in numerical form. The diagnostic trouble codes are stored in the BCM and can range between 23 and 51. The ATC control 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 Mode button on the ATC control. It is important that no other knob or button is pushed until all codes are read. Pushing any button except Panel Mode or turning a knob will end the diagnostic test without showing the rest of the trouble codes.
Let me know what codes appear and we'll go from there.
Roland
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QUESTION: i did the code and it flashed and nothing came up. went right back to heat.
AnswerHi Michael,
That no code result would tend to suggest that either the heater core is plugged or there is air trapped in the core so that the heated water from the engine is not flowing through it. I would touch the two hoses under the hood that flow from the engine compartment to the cabin which carry the water to and from the core to determine if they are approximately equally hot. If not then let me know and we can deal with that. Another possible cause is low level of coolant in the system. Have you checked the level of coolant in the overflow bottle? Is it at the level indicated it should be on the side of the bottle? Was the coolant drained from the system and refilled recently? There is a special funnel and procedure required to do that.
Roland
