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Chrysler Repair/heater blowing cold air: '00 LHS

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Expert: - 1/5/2012


Question
i have a 2000 chysler lhs 3.5L with atc just replaced t/stat and coolant,bled system but still get cold air blowing from system first time for this problem

Answer
Hi Bob,
I would first verify that you do have coolant flow through the HVAC heater core. Drive the car until it is warmed up, then compare the temperature "to touch" of the incoming and outgoing hoses that pass through the firewall from the engine to the heater core. They should feel about equally hot. If not, then you either have air trapped in the system or a heater core that is partially clogged. There is a detailed procedure for refilling the system so if you may not be aware of that let me know and I can tell you the details. If the that was done properly and still the hoses are quite different in temp then I would try back-flushing the heater core to improve the flow through.
If the hoses support the idea that you have good flow through, then the likely cause of no heated air is that the blend door air actuator is not moving that door properly to get the desired mix of air that is cold and air that is hot. There is a self-diagnostic capability of the HVAC control head but its means of access depends upon whether you have the digital temp readout type of controller (called automatic temperature control), or a conventiinal control. Let me know which I then I can tell you how to run that diagnostic test.
Roland  

Chrysler Repair

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Roland Finston

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I specialize in Chrysler/Dodge/Plymouth cars, minivans, and SUV's for the model years 1982-2008 based upon my 50-year DIY experience, factory shop manuals and wiring diagrams. I offer fast repair advice to help you minimize repair costs by helping you diagnose and do it yourself. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty.

I take questions one at a time between 8am and 10pm CT and attempt to answer within 20 minutes. "Maxed Out" means I am answering another question of otherwise busy, so try again later.

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Five decades as a 'do-it-yourselfer' on domestic and imported cars

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Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)

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Degrees in Physics/bruised knuckles.

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"Top expert of 2010" and "2011" at Allexperts. Among top 50 experts for years 2006-2009 at Allexperts.

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