Clicking behind climate control module

[74b5roadrunner]

I can hear intermittent clicking from behind the radio/climate control module. Clicking is there with climate control on or off. Are there any relays hidden back there. Only relays I can find are under hood/back seat.

[Archon]

Could very well be what is listed in this TSB.

A/C - Module Emits a `Tick-Tock' Noise


File In Section: 01 - HVAC

Bulletin No.: 01-01-38-007

Date: May, 2001

TECHNICAL
Subject:
Tick-Tock Noise From HVAC Module Assembly (Install Spring)

Models:
1997-1999 Buick Park Avenue, Ultra with RPO CJ2
2000-2001 Buick LeSabre with RPO C67
2000-2001 Pontiac Bonneville with RPO C61

Condition

Some customers may comment that the Heater and Air Conditioning (HVAC) Module Assembly emits a repeating "tick-tock" noise.

Cause

The "tick-tock" noise may be due to the two air mix (temperature) actuators on the Park Avenue HVAC module and the mode and air mix (temperature) actuators on the Bonneville and LeSabre HVAC module oscillating/cycling when they have reached a position on the HVAC module.

Correction

Install a deflector spring, P/N 25732764, in the covers of the two air mix (temperature) actuators on the Park Avenue HVAC module and in the covers of the mode and air mix (temperature) actuators on the Bonneville and LeSabre HVAC module.

[BlackHawk99]

Ha!

Mine does the same thing periodically. I've never taken the time to investigate why. Just another thing that I deal with!

[skregal]

If your climate control temp dials are all the way to hot or all the way to cold, try
moving them a little to see if the clicking stops. If it does, then it is the air-mix
actuators.

[nos4blood70]

I have the weird clicks too! But only when running it on auto mode.

[97ParkAve]

My 97 Park Ave does the same thing, I brought it to the Buick dealer and they told me it was the control head (which I doubt...), but the mechanic told me if you unplug the fuse for the control head for about a minute it will reset and stop the clicking temporarily. It does work just not a permanent fix.

[BlackHawk99]

If your climate control temp dials are all the way to hot or all the way to cold, try
moving them a little to see if the clicking stops. If it does, then it is the air-mix
actuators.

Yep, that does make it stop. I have the same issue in my pickup...I just bump them to one setting below the max and it stops.

[gweg_b]

Mine does it too. Used to annoy me when I originally got the car, but I've managed to filter it out over the years, and I almost never notice it now.