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The thumping seems to be real noticeable when the fan comes on / ac or heater? Is this a serious problem?

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  • Cars & Trucks Master
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The blower fan may be warped and rubbing against the case. Pull the motor and inspect the blower wheel to see if it's true.

Posted on Nov 19, 2014

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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The engine Temp gauge got real close to "H"but went down soon as i got rolling.Also engine cooling fans not coming on. even when i engaged AC. the fans are electric. . .?


The reason that you drive and engine cools down is that cool wind is blowing in the grille in front of the car and when you stop, that natural wind stops cooling it down.
First check the fan fuse. If it is OK check the fan itself: just apply wires on the connector of the fan and attache it to the battery (dont mix "+" and "-") If fan will not start, replace the fan motor. If it starts check for the Fan Motor Relay
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Oct 27, 2015 | 2008 Ford Escape

2 Answers

I'm getting an intermittent loud flapping sound when the AC is turned on my 2009 Smart ForTwo


Question. Is the flapping at a very fast pace that would indicate the speed of a fan blade hitting something? If so, you may be on to something there such as a misplaced gasket or something has dropped/fallen into the blower box via a vent.

If it is not that speed then see the following..

Hope I can give you some direction. Speaking from a generic sense all ac/heaters these days have a door or doors in the blower box that control air flow from the main part of the box to different positions when you ask for vent, heater, mix, defrost etc..

Most these days are operated with a small electric servo/motor and unfortunately the mostly have plastic gears that wear and can "thump-thump" as the motor cycles trying to open or close the flapper door.

Try to change the air direction from Max AC to regular ac to heater, defroster, bi-level etc all with the AC switch in the on position if you have a separate on/off switch.

Listen to the sound and see if it comes and goes with a different location of the selector switch.

One last question. Does it happen at idle or driving down the road at any particular speed?

Lets start with that and see what happens. This is interesting.

Good luck!

May 28, 2014 | 2008 Smart fortwo

1 Answer

AC/Heater Blower Fan in 1990 LS400 works intermittently


Due to the age of your vehicle, the brushes in the fan motor are worn out. you will have to replace the fan motor, it is not serviceable.

May 30, 2017 | 2001 Lexus RX 300

1 Answer

Car gets hot whenever the AC is on, once turned of the temp starts to go down.


either the fan on the front isnt coming on when AC engaged or another reason could be its overcharged with R134 so when Ac is on the compressor is srtaining but you would notice engine slow down when AC engaged if this was the case .,If both first causes seem to be ok then take bottom hose off and flush cooling system using a heater hose connection and reverse the flow a few ,garden hos perfect for this ,then refill with a 50% antifreeze solution and see what happens

Apr 25, 2011 | Hyundai Tucson Cars & Trucks

2 Answers

Where in the heck is the radiator fuses on a 2003 chevy monte carlo SS. The passenger side fan motor has quit but is showing it has power when tested with a testing light?


if you have power there then the fuses are good or relays but if you have power then you ethier have a bad fan or ground wire also that fan should only come on when the ac is on

Aug 27, 2009 | 2003 Chevrolet Monte Carlo

1 Answer

1994 nissan pickup--heater not blowing hot enough air


your fan motor is shot, motor has bad brushes replace it, if u feel its still not hot, drain your rad and but a 28 oz bottle of pine sole and add water till full, run it for about 20 mins. drain, run strait water, drain, then put anti frezz in with water, 50/50 mix or mix your own. it should clean your cooling system compleatly out.. do not turn heat on while pine sole is running throw it, gives of a bad smell.

bert

Jan 28, 2009 | 1994 Nissan Pickup

2 Answers

Heater


Try spinning the knob real fast in either direction. Sounds stupid but it worked for me.

Sep 27, 2008 | 2005 Chevrolet Malibu

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