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Knocking sound in dash no heat - Hummer Cars & Trucks

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After having air bags replaced have no heat on drivers side

Sounds like they may have knocked the ductwork off. Did you take it back to where the bags were replaced?

Dec 15, 2017 | Cars & Trucks

1 Answer

When i turn on heat or ac on face i hear a knocking noise coming from behind dash

If it doesn't turn to the Face/dash. Then you have some work ahead of you. The motor is turning(causing the knock sound) but the door in the plenum isn't. The gear is what's causing the noise. But I could be wrong. Older cars don't have this. Year make and model please.

Feb 27, 2015 | AC Cars & Trucks

1 Answer

I have a 1999 5.4 f150 4x4 loud knocking started on passanger side also guages all pinned and bounced around truck runs rough and stalls what could it be

it sounds like a critical internal failure is eminent . if the oil pressure is ok,it could be a bent or broken valve as the exhaust leak can let the valves cool to fast and warp. however it sounds more critical than that. do a compression test on that side and see if the #'s are consistent.

Feb 24, 2015 | Cars & Trucks

1 Answer

Knocking noise from front end

bad motor or transmission mount.

Nov 11, 2017 | Saturn Ion Cars & Trucks

1 Answer

Knocking Noise

Check blowers motor cage under dash sounds like it faulty

Jan 13, 2014 | 2004 Ford Expedition

1 Answer

My heat went in my 2004 ford explorer...its blowing colding and there is a knocking noise

The knocking noise is the key. Assuming the coolant level is correct, and the thermostat is working correctly, it sounds like you have a blend door actuator concern. If the knocking noise is coming from the center dash area, the blend door needs to be replaced. The radio and center trim will need to be removed, the blend door removed and the blend door needs to be manually moved to verify heat. Good luck.

Apr 04, 2011 | 1998 Ford Explorer

1 Answer

The heat on my 1998 Cadillac deville won't come on, just makes a knocking sound underneath the dash board.

Sounds like the motor that opens the door in the duct work to let the heat in isn't working right or the door is jammed.

Feb 22, 2010 | 1998 Cadillac Seville

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