No heat
Thread Starter
TECH Regular
Joined: Oct 2011
Posts: 407
Likes: 2
From: Keller Tx
No heat I have had heat in the last week but when I need it it's not there. I have flushed the heater core twice and it did work for a few days. The engine heats up fine with a new thermostat.
I am wondering if it isn't the dial that goes from cool to hot on the interior control. Is there supposed to be a flap under the dash the moves and lets incoming air pass across the heater core? Any ideas how I can verify or see if this is the case? The defrost, floor , dash vents all work fine but with no heat.
Thank you in advance for any input.
I am wondering if it isn't the dial that goes from cool to hot on the interior control. Is there supposed to be a flap under the dash the moves and lets incoming air pass across the heater core? Any ideas how I can verify or see if this is the case? The defrost, floor , dash vents all work fine but with no heat.
Thank you in advance for any input.
Thread Starter
TECH Regular
Joined: Oct 2011
Posts: 407
Likes: 2
From: Keller Tx
Ok I have seen the diagram for the HVAC under dash controls. The question I still have is the flap that opens and closes off the heater core vacuum operated like the other controls for floor, defrost, dash vents?
Any input would be greatly appreciated.
Any input would be greatly appreciated.
Teching In
Joined: Dec 2009
Posts: 26
Likes: 0
From: Dallas, GA
If you can hear the actuator closing and opening the air flap then it is not a vacuum problem. If there is no coolant on your passenger side floor your heater core is more than likely clogged.
I had the same problem: we drained the coolant unhooked the heater hoses from the water pump and flushed out the heater coil with an air compressor. Then flushed the whole system and refilled with coolant. Heat now works just like new.
Turns out that Dex Cool overtime coagulates in the heater core and can eventually clog it up.
I had the same problem: we drained the coolant unhooked the heater hoses from the water pump and flushed out the heater coil with an air compressor. Then flushed the whole system and refilled with coolant. Heat now works just like new.
Turns out that Dex Cool overtime coagulates in the heater core and can eventually clog it up.
