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#4072182 - 07/28/20 06:55 PM A/C orifice
larrys Offline
Member

Registered: 06/09/07
Posts: 292
Loc: md
can you tell me the better of the two UAC EX 7000C A/C Orifice Tube

Four Seasons 38639 Orifice Tube also I can not remember the location that it is inserted in the 2004 grand marquis.
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2004 stock grand marquis

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#4072252 - 07/29/20 11:32 AM Re: A/C orifice [Re: larrys]
BigMerc96 Offline

I know nothing
Posting Addict

Registered: 06/05/10
Posts: 19766
Loc: I can see Detroit from here!
Looks like the 1st one is a variable orifice tube, which does have some advantages over a fixed one like possibly improving performance at low RPM. I put a variable orifice tube in my '98 when I replaced my accumulator, I didn't really see any difference. It works better than it did before with the OE fixed orifice, but the AC wasn't working 100% properly to begin with due to the accumulator leak so its not really a true comparison of equals. I mean, it works great, just not sure if the variable orifice tube really made any difference or if it would work just as well had I replaced it with a new fixed tube. I'm not going to change it again either way.

AFAIK, the orifice tube is in the same location on a '03+ as it is on a '79-'02, it should be in the lower line going into the evaporator housing. There's a quick disconnect fitting where the AC hose attaches to the evaporator and the orifice tube is in the evaporator side of that connection.
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-Steve

2006 Audi A6 ~132k miles, stock.
1998 Mercury Grand Marquis LS HPP ~100k miles, slowly acquiring modifications.
1997 Town Car Cartier ~145k miles, Ported Plenum, Gutted Airbox, Contour E-fan Retrofit, Dual exhaust with Magnaflows, cats deleted, MSD Ignition, KYB Gas-A-Justs, P71 front bar, air ride reinstated, Projector retrofit, Caddy 4-note horn retrofit, Wood rim steering wheel retrofit, holistic weight reduction as the parts fall off..
1996 Mercury Grand Marquis GS 117,485mi. R.I.P. 7/14/12 frown

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#4072262 - 07/29/20 01:06 PM Re: A/C orifice [Re: larrys]
larrys Offline
Member

Registered: 06/09/07
Posts: 292
Loc: md
thanks
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2004 stock grand marquis

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