91 Explorer A/C parts, what's the difference between parts marked"From 4/91" and "To 4/91"?

All the A/C parts for the 91 Explorer, like hoses, blower motor, etc
call out two different part numbers. One is marked "To 4/91" and
another "From 4/91". Was there some kind of significant change at
April 1991?

I'm kind of puzzled what to do because my A/C compressor, dryer, etc
are replacements installed in 2001, so which parts do I use? I have a
leaking compressor hose that needs to be replaced but don't know which
part to buy.

"runderwo" > wrote in message
...
> All the A/C parts for the 91 Explorer, like hoses, blower motor, etc
> call out two different part numbers. One is marked "To 4/91" and
> another "From 4/91". Was there some kind of significant change at
> April 1991?
>
> I'm kind of puzzled what to do because my A/C compressor, dryer, etc
> are replacements installed in 2001, so which parts do I use? I have a
> leaking compressor hose that needs to be replaced but don't know which
> part to buy.

This changes MIGHT correspond to the transition from R12 to R134a.
Im not sure, but the early 90's is about when this happened.

What refrigerant do you actually use?

Very often you can find a parts number or designator on these hoses. That
might help you. You could also measure the hose, and sketch out the shape
and see if a local parts house or dealer will let you take a look at the
selection of hoses.

Since your Explorer WAS cooling at some time, I would rather replace the
hose with what is already in it than juggle with what might have been the
parts recommendation at some time.

On 3/30/10 12:24 PM, in article
, "runderwo"
> wrote:

> All the A/C parts for the 91 Explorer, like hoses, blower motor, etc
> call out two different part numbers. One is marked "To 4/91" and
> another "From 4/91". Was there some kind of significant change at
> April 1991?
>
> I'm kind of puzzled what to do because my A/C compressor, dryer, etc
> are replacements installed in 2001, so which parts do I use? I have a
> leaking compressor hose that needs to be replaced but don't know which
> part to buy.

Was it converted to R134 when the compressor was replaced, or are you still
running an R12 system? If its still R12, then you need to find out when
your truck was built (before or after 4/91) to get the right part. If it
was converted, all bets are off.

The easiest way is to take off the old hose & take it with you to match up
with the dealer's stock (or parts book) to get the right one.

If it doesn't match anything, you can always take it to an A/C shop and have
a new one made.

On Mar 30, 1:24*pm, runderwo > wrote:
> All the A/C parts for the 91 Explorer, like hoses, blower motor, etc
> call out two different part numbers. One is marked "To 4/91" and
> another "From 4/91". Was there some kind of significant change at
> April 1991?
>
> I'm kind of puzzled what to do because my A/C compressor, dryer, etc
> are replacements installed in 2001, so which parts do I use? I have a
> leaking compressor hose that needs to be replaced but don't know which
> part to buy.

You'll have to get the part # off of the compressor to determine which
one you have..

The only difference I see in the compressor is my catalog is asking if
it's factory or dealer air.

As for your drier their is a difference so you'll probably have to do
a visual to determine which one you have..

Four Seasons part #'s are
FOUR SEASONS 33053
[A/C Accumulator]
From 3/91
FOUR SEASONS 33182
[A/C Accumulator]
Before 3/91

You can go to their website www.4s.com and look at them to see which
one you have.

the hose assemblies are most likely different too.

FOUR SEASONS 56116
[A/C Refrigerant Hose]
Discharge and Suction Line; From 4/91
FOUR SEASONS 55600
[A/C Refrigerant Hose]
Liquid Line w/o Orifice Tube
FOUR SEASONS 55651
[A/C Refrigerant Hose]
Discharge and Suction Line; Before 4/91

Thanks everyone who replied. I think I have at least the hose issue
figured out. It looks like that they changed the hose routing at that
time. My truck (built in 1/91) routes the suction hose around the
back of the intake, but the other hose used from late 91 to 93 routes
around the top/front. So I guess this doesn't depend on the A/C parts
as much as the engine itself.

What's in the truck currently is a FS10 compressor marked "R-12 or
R-134a", an accumulator marked XH-7, and hoses marked "Barrier Hose".
So the conversion was complete/professional.

I was confident enough to order a new "To 4/91" hose based on the
above. If I am wrong, I'll be back!

How have people fared with having A/C hoses rebuilt at a shop? I
might do that next time if it's economical and as reliable as OEM
stuff.

runderwo wrote:
>What's in the truck currently is a FS10 compressor marked "R-12 or
>R-134a", an accumulator marked XH-7, and hoses marked "Barrier Hose".
>So the conversion was complete/professional.

>How have people fared with having A/C hoses rebuilt at a shop? I
>might do that next time if it's economical and as reliable as OEM
>stuff.

I converted my 1978 VW Rabbit to R-134a around 1995 and had new rubber
hoses installed over the original metal fittings by the oldest auto A/
C shop in town, the one every garage recommended. I never had to add
more refrigerant during the next 5-6 years I kept the car. I made the
conversion after the original York compressor seized for the 3rd time
in 6 months. I changed everything except the original evaporator and
TXV and replaced the original round tube serpentine condenser with a
flat tube universal fit condenser from J.C. Whitney since summers
would regularly reach 115F. I don't think Ford uses TXVs, so at
least lower the evaporator cycling switch pressure to trigger at 22-23
PSI rather than the normal 25 PSI for R-12 or else the air will never
blow out cooler than 50-55F. I'd also replace the orfice tube with
one calibrated for R-134a, and if you live where summers reach 100F,
upgrade the condenser as well, especially with any vehicle having a
large passenger compartment. The Ford FS10 compressor isn't a good
candidate for R-134a, and Ford switched to another model (FX-12 or
FX-15 was the model) when they started installing R-134a at the
factory.

"runderwo" > wrote in message
...

> How have people fared with having A/C hoses rebuilt at a shop? I
> might do that next time if it's economical and as reliable as OEM
> stuff.

I've never done that.
I've always been able to get hoses that were made for the application,
not wanting to have to wrestle with cobbled up hoses.

On Mar 31, 12:02*am, wrote:
> [..]
> would regularly reach 115F. * I don't think Ford uses TXVs, so at
> least lower the evaporator cycling switch pressure to trigger at 22-23
> PSI rather than the normal 25 PSI for R-12 or else the air will never
> blow out cooler than 50-55F.

Yeah, I'm doing this and I'm going to get a hose made adding a high
side cutoff switch as well.

> I'd also replace the orfice tube with
> one calibrated for R-134a, and if you live where summers reach 100F,
> upgrade the condenser as well, especially with any vehicle having a
> large passenger compartment.

I might try out one of those "smart" variable orifice valves. 20
bucks
or so.

> The Ford FS10 compressor isn't a good
> candidate for R-134a, and Ford switched to another model (FX-12 or
> FX-15 was the model) when they started installing R-134a at the
> factory.

I think you have that backwards. The FX15 was the original "black
death" compressor that came with the R-12 systems and failed in
a way that basically destroyed the whole system. The FS10 I
have is clearly marked "for use with R-12 and R-134a".