Car Sounds
Heating AC and Engine Cooling
Ford Explorer XLT
Chevy Trailblazer

What would cause a knock sound in the dash after turning off the AC-heat?

858687

Top Answer
User Avatar
Wiki User
Answered
2005-12-20 23:53:13
2005-12-20 23:53:13

The knocking sound could be the doors of the vents closing when you turn it off,they are controlled by vacume.Or it could be the plastic making the sound due to change in temperature. If it is a early to mid 90's Chevy it is most likely the actuator solenoid that controls the recirc or fresh air. If it is it will knock for about a minute and 30 seconds when you start the vehicle and about the same wheen you turn it off.

001
๐Ÿ™
0
๐Ÿคจ
0
๐Ÿ˜ฎ
0
๐Ÿ˜‚
0

Related Questions


Suspension is the most likely cause of your knock when turning. The part responsible is probably your tie rod, which is what allows you to turn the steering knuckle. They are inexpensive and easily replaced. You can avoid an alignment fee by being careful with your measurements during replacement.

NO it will not. If you have a knocking sound then you have trouble inside of the engine.

The cause of the squealing sound is because you are turning the steering wheel completely to the right or left

Singing water pipes can be caused by air that is trapped in the pipes. The air can cause a whistling or singing sound, or it can cause the pipes to knock or rattle.

If it is a front wheel drive sometimes a bad cv joint can cause a popping sound when you are turning.

if its a front wheel drive vehicle then it could be the axels

Low coolant causing air bubbles in the heater core.....

knock knock and many more such as Kick, Kids, Knife, etc.

Try turning the volume knob up! Or move it closer to your ear.

Most likely a bad hub. Try turning the steering wheel right or left and see if the sound changes or goes away while turning. If it goe away or significantly changes when you turn left it is probably the right hub and vice versa when you turn the other way. If you hear a popping sound when turning it is the constant velocity joint.

light slapping knock is a piston knock a loud heavy repetitive knock is a connecting rod Very Bad

Yes. The word knock (nok) has a short O (aah) sound as in dock and clock. The short O is seen in words such as hot and stop.

This sound is cause when the strut top are worn out the need to be replaced can cause coil springs to break. They are pretty expessive 183.00 a side.

It's a word to present the sound knock. Many words such as hark to create a phantom of a sound knock which can easily be pronounced and spelled without any difficulties.

security system there is a security reset button in the glove box.

You can't. This feature was never implemented, just the sound.

Knock knock whos there interrupting cow interrupting cow who MOOOO!

No, knocking in an engine is normally more serious than a gasket leak. Depending on how heavy the knock sound is it could be the Big Ends bearings need changing or it if its fainter than that it could be the timing is out. Either way it can cause real damage to the engine and should be repaired as quickly as possible. Have seen exhaust manifold gasket leaks that are described as a 'knock' by inexperienced persons. Normally a knock is piston connecting rod bearings that have gone out.

If the sound occurs only when turning, (left or right) the most likely cause is a loose power steering belt. First check to see if the belt is tensioned correctly, or in need of replacement.


Copyright ยฉ 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.