Question about Cars & Trucks
Even with hot water flowing to the heater core supply line, it blows only cold air.
Probably have a plugged heater core, sometimes if you hook the output line up to a hose with the input disconnected you can backwash the core and maybe clear out the stoppage. Otherwise you would need to
replace the core!
Posted on Nov 28, 2012
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Posted on Jan 02, 2017
you need to check the blend door in the heater box it maybe broken or stuck.the blend door switches between the heater core and ac evaporator to provide a mix of temperature
Posted on Oct 18, 2009
SOURCE: Heater blows cold air when idle
Sounds like you may have a partially plugged heater core. You could flush this out separately, from flushing radiator & engine block. Diconnect heater hoses going to your heater core and clamp off, so not to loose coolant from engine. Now hook up separate hose to one side of heater core pipe and flush out with typical garden hose. Repeat procedure on both heater core inlets. Reconnect original heater hoses and test difference. You may have to add an additional litre of antifreeze. If this don't work i suggest changing heater core. Good luck.........Ron.
Posted on Jan 03, 2009
One thing to consider is your thermostat and water pump. If somehow, your thermostat is stuck open, your engine won't get up to temperature. Also, a bad waterpump won't move coolant thru the heater core. Both of these situations should show up on your engine temperature, making it hot or cold...but sometimes they don't show up if your driving pattern doesn't tax the engine..My daughter's car had a bad electric cooling fan , and never was a problem, unless she was stuck in traffic...
Posted on Dec 06, 2009
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