Newbie with a question for the experts - 2003-04 Mach 1 Registry Owners Club

flstud89 · 01-02-2007, 06:01 PM

I've had the pony for about a week now. Bought it with 20,000 miles and I love it. When at lights or going slow I hear a clunk from the engine bay. It happens about every 30 seconds it sounds as if something is opening and closing and there's no problem with the cars performance. Any ideas?

hawk · 01-02-2007, 06:43 PM

Is your climate control set to "AC" or "defrost"? Sounds like the AC clutch kicking in and out.

StangIT · 01-02-2007, 07:02 PM

That's what i was going to say. Mine does the same thing.
I think it's time to replace my A/C compressor or it's clutch.

G · 01-02-2007, 07:03 PM

Welcome to the Registry.

If it's not the ac clutch, post more info and we will figure it out.

canadianmach1 · 01-02-2007, 07:13 PM

Do a search , I recall a tsb out there for that, I think a AC line was hitting on something.

C-dub · 01-02-2007, 09:20 PM

Quote:

Originally Posted by canadianmach1

Do a search , I recall a tsb out there for that, I think a AC line was hitting on something.

they black bottle thing to close to the fire wall i believe?

Intmd8r32 · 01-03-2007, 12:28 AM

Ive had that same concern in the mornings when I turn on my heater but it goes away after its warm and I turn it off.

Russ Johnson · 01-03-2007, 01:16 AM

I had a similar thing, it happened when the AC compressor kicked in, it was the pressure hose from the compressor getting charged and hitting the firewall. Or at least thats what I was told.

falcongtho3 · 01-03-2007, 07:08 AM

Yep. Welcome to the world of the infamous A/C thump. There is a TSB on it, and it is the hose shifting when the compressor engages. You can actually fix it yourself with some pipe insulation and zip ties. Look at the right side strut tower and the hose right next to it. When the A/C cycles the hose shifts and thumps againt the strut tower. By wrapping the hose in the pipe insulation it keeps it from shifting as much and muffles the noise. Hi-tech...eh?

01-02-2007, 06:01 PM	#1
flstud89 flstud89 Join Date: Jan 2007 Location: Alexandria, VA Posts: 189	Newbie with a question for the experts I've had the pony for about a week now. Bought it with 20,000 miles and I love it. When at lights or going slow I hear a clunk from the engine bay. It happens about every 30 seconds it sounds as if something is opening and closing and there's no problem with the cars performance. Any ideas?

01-02-2007, 06:43 PM	#2
hawk Braderunna Join Date: May 2004 Location: hampton, va Posts: 4,955	Re: Newbie with a question for the experts Is your climate control set to "AC" or "defrost"? Sounds like the AC clutch kicking in and out. __________________ "Sparky"- 2003 Azure Blue w/MT and IUP Visit my garage on mach1mustang.org for details.

01-02-2007, 07:02 PM	#3
StangIT I smell burning rubber! Join Date: Aug 2006 Location: Seattle, WA Posts: 929	Re: Newbie with a question for the experts That's what i was going to say. Mine does the same thing. I think it's time to replace my A/C compressor or it's clutch.

01-02-2007, 07:03 PM	#4
G Undocumented Member Join Date: Feb 2004 Location: Enterprise, AL Posts: 15,293	Re: Newbie with a question for the experts Welcome to the Registry. If it's not the ac clutch, post more info and we will figure it out. __________________ _____________________________________________ Psalms 109:8 'Let his days be few; and let another take his office.'

01-02-2007, 07:13 PM	#5
canadianmach1 Registered User Join Date: Mar 2005 Location: edmonton canada Posts: 538	Re: Newbie with a question for the experts Do a search , I recall a tsb out there for that, I think a AC line was hitting on something. __________________ mods, bbk longtubes, bbk xpipe , slp loudmouth2 catback, meziere water pump, FR aluminum DS , php spacer, 4drilled/slotted rotors, Mgw shifter, Sequential taillights, Hood lift kit, 3gauge A Pillar , vortech with air/air, Anderson powerpipe, cobra tank/pumps, and dyno tune.

01-03-2007, 12:28 AM	#7
Intmd8r32 Registered User Join Date: Jan 2006 Location: TEXAS Posts: 277	Re: Newbie with a question for the experts Ive had that same concern in the mornings when I turn on my heater but it goes away after its warm and I turn it off.

01-03-2007, 01:16 AM	#8
Russ Johnson Registered User Join Date: Jan 2005 Location: Weston, MA Posts: 152	Re: Newbie with a question for the experts I had a similar thing, it happened when the AC compressor kicked in, it was the pressure hose from the compressor getting charged and hitting the firewall. Or at least thats what I was told. __________________ 04 Black Mach w/IUP Mac LT's, SLP Loudmouth 2, Mac High flow Catted H, MGW Short Shift, C&L Maf CAI, various billet interior upgrades, AFS Mac Black 18x9 275/35/18's all around, Denso Iridium plugs, Granatelli Plug Wires 304.26 hp 325.78 tq. Soon to be a rebuilt with a lot more power!!!!

01-03-2007, 07:08 AM	#9
falcongtho3 Moderating at Mach 1 Join Date: Aug 2002 Location: Baton Rouge, La. Posts: 12,908	Re: Newbie with a question for the experts Yep. Welcome to the world of the infamous A/C thump. There is a TSB on it, and it is the hose shifting when the compressor engages. You can actually fix it yourself with some pipe insulation and zip ties. Look at the right side strut tower and the hose right next to it. When the A/C cycles the hose shifts and thumps againt the strut tower. By wrapping the hose in the pipe insulation it keeps it from shifting as much and muffles the noise. Hi-tech...eh? __________________ Krewe de la Mach Rouge #340804 13th Mach 1 built 11/07/02 Build Date 12/13/02 Delivery

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