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2003 mecury heater system makes noise like flapper valves chattering on start up

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Air blend door actuator is faulty or damaged!!

Posted on May 10, 2010

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What would cause no power steering or brakes when started one time but then there next start?

Was your brake pedal on the floor or hard to depress? Your chattering might be the serpentine belt system. Remove the belt and test quickly again for noise, you will not have powersteering or cooling or charging systems, but you are just trying to pinpoint your chattering so you dont have to guess. You might want to replace your vacuum valve at power brake booster if your pedal was hard. It is a oneway valve that opens when the car gets turns on and pulls down a vacuum to assist the brake system. Sometimes the stick. If your brake pedal was on the floor, which I doubt at all, do not drive and seek professional help. Maybe your pedal assembly is coming loose and needs repinned.

Feb 20, 2016 | 1999 Oldsmobile Eighty Eight

1 Answer

Where is the heater control valve located?

If you are trying to locate some kind of water valve that routes the hot water to or away from the heater core, no such animal exists anymore. Hot water is always routed thru the heater core whether or not you are using the heater. The blend box under the dashboard has flappers that move to route air either thru the heater core, the A/C evaporator, or thru a bypass that routes around both. The blend box allows you to set temperature by adjusting the flappers. It also controls where the air goes; defroster vents, floor vents, or dash vents. If you are not getting heat, the problem is most likely that the blend box flapper is not operating correctly. This could be due to a sticky linkage, a bad vacuum motor, or a faulty control head. You could also have a clogged heater core, or a thermostat that is stuck open all the time. If you are getting heat and don't want it, the blend box flapper is also the most likely cause.

Oct 18, 2015 | 2003 Chevrolet Malibu

2 Answers

How do i confirm a blend door problem?

Look at the motorcraft site & get to the parts area

Use your VIN # then your got exactly your vehicle

Enlarge the view of all the under dash HVAC Motors
or servos & write down the OE numbers for later

If you can have the module scanned professionally
& if that data is there, it may tell you the failed ones

Either way you try all the manual settings for air flow

The ones that fail to switch, along with your motorcraft
view of them ,will guide you to the one you have to replace

If that is the problem,only then do you go under the dash,
remove the glove box, etc

Also look at & feel all the coolant tubes that may be on the
passenger side sub frame rail or going from the radiator,
coolant fill,all heater related tubes & hoses,they may not all be hot

They all have to be hot or you have a failed heater control
valve somewhere

I have one here for my Lincoln LS to install if it stops raining
& snowing

First establish if you have hot coolant going into & out of the heater core,then work on the control valve if that applies then
the under dash blend doors

If you had the factory manuals I purchase you would be all set

Try the internet & you tube video also & ask for your vehicles
heater issues

Nov 24, 2014 | 1999 Mercury Grand Marquis

1 Answer

How do I confirm a blend door / actuator problem?

blend door concerns heat and cold air ducting flapper. whether electronic or manual truning of a knob there is a movement noise. a motor/s make/s a sound on electronic controlled ones or a turn knob harder at times to turn does this. then feel the changes hot/cold breeze and no breeze etc..on the vent according to what you turn the system on to do. it is best to confirm movement /motion of the internal motor or flapper during night time or early morning in the garage inside the car devoid of noise to hear the motor or flapping movement, must hear some motor effort or feel hand effort if cable to the heater valve is intact/ not snapped to open heater valves on the engine side. then inspect heater cable if heater is not working etc..hope this helps.

Nov 24, 2014 | 1999 Mercury Grand Marquis

1 Answer

When i turn on the heater it starts make a weird noise and blows cold air

blower is squawking due to bad bearings internally.. needs replaced.. as for cold air check fluid levels first.. then be looking into heater hoses and control valves..

Dec 08, 2013 | 2003 Ford Explorer

1 Answer

03 eclipse making noises in cold weather

First you need to find the source that is causing noise. On cold weather is very normal engine belts or belts idle pulley bearings or belt tension-er to make noise, especially when they are old. Also power steering pump too especially if the oil is very old.

Feb 03, 2013 | 2003 Mitsubishi Eclipse

1 Answer

Loud chatter on start and rattle from timing chain area

The timing chain area also takes in the alternator and water pump. To isolate the source of the noise, use the old mechanics trick.

Place a 3 foot 1/4 inch brass rod against the flap at the opening of your ear and push until it closes. Place the other end of the rod against various engine components and listen. The noisy problem will conduct the noise up the rod to your ear and you can hear quite precisely where the problem is. Much safer than laying your ear all over a running engine.

You can also loosen the fan belt and run the engine without alternator or water pump (briefly) to see how that affects the problem. Chatter on start makes me think of starter and Bendix gear problems. Sounds like a 2 person diagnostic team to me; one to start the car and one to listen and probe.

Don't know if Subaru Forrester has an engine that has valve interference at piston Top Dead Center. If it is and the timing chain breaks, you are looking at major $$ to recover.

Nov 06, 2012 | 2004 Subaru Forester

2 Answers

AC/Heater control valve :Lancer 2003 Misubishi

The sliding switch on the console is stuck in the cold position and the knob is pulled off. Use pliers to jiggle the switch as best you can. Feel under the center console and you probably will find the cable that is hooked up to the flapper. You'll know because when you jiggle the cold/heater switch at the upper console, the cable will move slightly. At the hookup of the cable to the flapper down under the console (passenger side) try to work the flapper loose to the open (or close) position. At the same time work the sliding switch (with pliers). The flapper will come loose and function properly. Try not to knock of the AC button like I did in the process. It flew off some where under the passenger seat. I'll find it sometime before summer. Ha.

Apr 21, 2010 | 2003 Mitsubishi Lancer

1 Answer

My engine makes a knocking noise

Could be a loose bearing on the crank shaft, it could also be valve lifter chatter. without knowing a little more info it is hard to diagnose

Mar 17, 2009 | 1987 Chevrolet S-10 Pickup

2 Answers

New rebuild chatters

adjust your valves your oil pickup tube needs to be adjusted you need feeler guages to adjust the valves down properly
make sure lifters and oil pick up tubes are not clogged

feeler guage is---> thin pieces of metal cut to different sizes to hold under valve adjusters till the play and chatter gone
check by book what the feeler size needed for adjustment

Jun 07, 2008 | 1983 Chevrolet C3500

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