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Annoying Clicking Noise

sIIgtst

By sIIgtst,
in General Maintenance

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sIIgtst Rising Star

sIIgtst

Posted
Posted

HI all

I have this annoying clicking noise coming from behind my aircon unit when i start the car.

it happens for about 30 seconds then stops.

It is getting pretty annoying does anyone have the same problem? and if so how did you fix it?

its an r33 gts-t.

any help will be great.

Thanks

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Jmaac Proficient

Jmaac

Posted
Posted

The clicking noise is from your Air Blend Servo motor (controls hot/cold mix). The gearteeth that control the flap have slipped off. It is really easy to fix, the only problem is removing the whole dash to get to it.

Easiest way is to make sure the heat is maxed all the way up, i.e. slam the red button a million times before u start the car (can be on or off), wont make the sound - leave it like that and wont happen again

sIIgtst Rising Star

sIIgtst

Posted
  • Author
Posted

hey jmaac

thanks for the advice.

would you know where abouts this blend motor is located on the unit

as due to my ever changin audio needs im somewhat of a pro at dash

removal now :whistling:.

and what to look for in the unit. will the gear be off or could it be that the

teeth have been shaved off.

Thanks

Eug Grand Master

Eug

Posted
Posted

the teeth have basically worn down due to use, they skip over each other as they try to engage causing the click click noise.

i've currently pulled my dash apart to fix it. it's not a small task, at least a 3 hour job to take the dash out.

see attached, note the red arrow on the gear.

the blend door motor is located right in the middle of the dash, above the heater box.

post-9983-1203031896_thumb.jpg

post-9983-1203031962_thumb.jpg

Zoggy Proficient

Zoggy

Posted
Posted

same thing has happened to mine, after a few months im getting a very nast smell eveytime i turn up the heat. i then noticed a wet patch under the dash of the passanger side. If i fix the noise would i stop the damn thing from leaking?

Jmaac Proficient

Jmaac

Posted
Posted

Smell is normal, remove the glovebox and theres a panel which u can remove to clean aircon filter elements

This wet patch is bad, either means your heater coil has rusted out or a hose is broken (b/n firewall and heater)/hose clamp needs tightening (Unless condesations is somehow running back down into your car). U can tie off your heater in the engine bay and loop it around or fix it properly.

Im not sure if u can get replacement gear for these or one from a hobby shop to fit. I used a little glue and was able to build the gear back up, but it didnt last very long. If anyone manages to get a replacement (not 2nd hand) can u please let us know, I may make an plastic injection mould if not avail.

ferni Grand Master

ferni

Posted
Posted
same thing has happened to mine, after a few months im getting a very nast smell eveytime i turn up the heat. i then noticed a wet patch under the dash of the passanger side. If i fix the noise would i stop the damn thing from leaking?

Noise has nothing to do with the leaking. The leaking is probably your heatercore, better to replace it sooner rather than later. The leak will only get worse, and where do you think that water is coming from? Your cooling system - better check and top it up :teehee:

You can bypass the heatercore if you like, just look for the 2 heater hoses going into the firewall on the passenger side, and connect them....

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