vent sucks cool air instead of blow heat

01-22-2009, 01:58 PM	#1
wayneled86 Newbie   Join Date: Jan 2009 Posts: 2	vent sucks cool air instead of blow heat two bedrooms in my house have developed the same problem. the return in each sucks are normally, but additionally the vents don't blow heat, instead suck air in a little. not as much as the return though. all my "output" vents at the furnace are connected. all other vents connected to furnace are ok. thanks

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01-22-2009, 07:09 PM	#2
SKIP4661 Member   Join Date: Dec 2008 Location: West Michigan Posts: 440	vent sucks cool air instead of blow heat Check the air filter and evaporator coil to make sure they're clean. Last edited by SKIP4661; 01-22-2009 at 07:09 PM. Reason: typo

01-25-2009, 03:11 PM	#3
wayneled86 Newbie   Join Date: Jan 2009 Posts: 2	vent sucks cool air instead of blow heat thanks. it's only two vents though the others are great.

01-25-2009, 11:10 PM	#4
JohnH1 Member     Join Date: Jan 2009 Location: Chicago, IL. Posts: 427	vent sucks cool air instead of blow heat Something had to have changed in the system like someone changed some damper settings. Try closing down on some dampers or registers to increase static pressure on the duct system. This should help. Make sure you mark the oridginal damper settings so you can always put back as it oridginally was.