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
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
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
Tips for a great answer:
Feb 23, 2015 | 2002 Ford Taurus
Feb 09, 2010 | 2005 Nissan Altima
Jan 28, 2010 | 2005 Chevrolet Impala
Feb 09, 2009 | 1997 Jeep Grand Cherokee
Jan 18, 2009 | 2004 Honda Civic
Jan 10, 2018 | 2001 BMW 5 Series
Dec 04, 2008 | 2004 Chevrolet Silverado 1500 Crew Cab
Nov 17, 2008 | 2004 Ford Explorer
60 people viewed this question
Usually answered in minutes!