clunk on startup

Reply Subscribe

Thread Tools

Search this Thread

Oct 21, 2005 | 03:01 PM

lifted_01_SD

Thread Starter

Senior User

Joined: Sep 2005

Posts: 101

Likes: 0

clunk on startup

Hey i wonder if any of you guys ever hear of a PSD having a small not to loud single clunk on cold startup about 2 seconds of running , pop , then all is good. It still performs well and there is no smoke or bad starts just a pop. its never done it before and its bothering me. It does not do it all the time. What could this be. All fluids are good. Its a 2001 PSD auto 4x4 stock with 197567 on the clock, please tell me its not going to grenade. please help.

Oct 21, 2005 | 03:37 PM

dvfd12

Tuned

Joined: Jul 2005

Posts: 281

Likes: 0

From: Sherman, IL

Does it sound like it comes from the right front?

Oct 21, 2005 | 03:57 PM

FrdTrkLvr

New User

Joined: Oct 2005

Posts: 16

Likes: 0

I have the same problem and yes it does come from the right front. Any ideas.

Oct 21, 2005 | 04:04 PM

Fire Rooster

Posting Guru

Joined: Feb 2004

Posts: 1,873

Likes: 1

From: Phx, AZ

Flapper valve for vents opening/closing depending on A/C being on or off. Turn A/C off start up truck and then, turn on A/c you will hear clunk later.

Oct 21, 2005 | 04:07 PM

FrdTrkLvr

New User

Joined: Oct 2005

Posts: 16

Likes: 0

I'll try that. Thanks for the help!

Oct 21, 2005 | 04:15 PM

PowerstrokeJunkie

Post Fiend

Joined: Jul 2005

Posts: 14,582

Likes: 12

From: 21791

i have heard on here that it is the A/C compressor clutch....

but it perfectly normal but doesnt sound too good.

Oct 21, 2005 | 04:31 PM

tjbeggs

Post Fiend

Joined: Apr 2004

Posts: 12,835

Likes: 3

From: Silver Lake Dunes, MI

not the compressor! its the blend door in the heater system that is operated by vacum. when it gets enough vacum after startup it slams shut causing the niose you hear. so no worry it IS normal and is NOT your compressor.

Top 10 Fords at 2026 Carlisle Ford Nationals

Joe Kucinski

3 Best / 3 Worst Parts of Modern Ford Ownership

Brett Foote

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

Pouria Savadkouei

Every 2026 Ford Engine Explained

Brett Foote

10 Ugly Ford Trucks That We Still Kinda Love

Joe Kucinski

10 Things Every Truck Owner NEEDS (2026 Edition)

Michael S. Palmer

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Verdad Gallardo

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Joe Kucinski

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Brett Foote

Top 10 Ford Truck Tragedies

Joe Kucinski

Oct 22, 2005 | 12:15 AM

Powerstrokedlariat

Postmaster

Joined: Sep 2004

Posts: 3,916

Likes: 0

From: Bellingham, WA

Mine does that every morning if I forget to turn the heater off.

Oct 22, 2005 | 02:45 AM

#10

99bajakid

Senior User

Joined: Nov 2004

Posts: 233

Likes: 0

is there any way to stop that? i hate it when my truck does it, maybe I should switch to decaf but it startles me sometimes. I can feel it throughout the floor board.

Oct 22, 2005 | 08:57 AM

#11

Fire Rooster

Posting Guru

Joined: Feb 2004

Posts: 1,873

Likes: 1

From: Phx, AZ

Quote:

Originally Posted by 99bajakid

is there any way to stop that? i hate it when my truck does it, maybe I should switch to decaf but it startles me sometimes. I can feel it throughout the floor board.

Do not turn on the heat or A/C. That will solve it. But then you gota deal with sweaty wet clothes, or chattering teeth.

Oct 22, 2005 | 05:52 PM

#12

jet2fan

New User

Joined: Nov 2004

Posts: 16

Likes: 0

From: South Georgia

I always turn a/c or heater to off, then turn truck off. After starting motor,then turn on a/c or heater. That solves the problem for me,unless I forget to turn everything off before staring up. Good luck