Rafterman191

Appears to be a sensor with some tranny or brake tubing. I am not getting any codes from the transmission on this '93 3VZE. Does anyone know what this is and what it does and where it should be installed?

dropzone

iTrader: (6)

any new puddles?

mct75

AC pressure switch?

87hoerunner

Maybe for the power steering assist. There's usually a power steering cooler in front of the radiator but idk about those year models. Does your a/c work?

Rafterman191

No puddles, no codes other than for the knock sensor. I have only owned the rig for a few weeks and it was overhauled hastily before I got it. Maybe it isn't even from this truck, just a spare part from a garage that fell in.

Rafterman191

I bet you're on to something there with the AC.

scope103

While it does look like an A/C pressure switch , that switch is located in the cooling unit inside the cab. http://personal.utulsa.edu/~nathan-b...15coolingu.pdf So whether that switch came from this truck or elsewhere, it didn't just fall off behind the grill.

millball

There is indeed such a switch in the AC line next to the dryer in the front of the truck beside the AC condenser.
It is the high pressure limit switch.
The switch @ the evaporator is the low pressure limit switch.

wyoming9

iTrader: (1)

Ac pressure switch to turn on those condenser fans that most likely have been removed.

I would have to look for the correct term but that is what it was part of.

scope103

There's no separate "high pressure" switch on my '94, not near the dryer or anywhere else. There's no high-pressure switch in the '93 manual.

Of course, the item in the picture could be a high-pressure switch (I can't tell by looking at the picture), but if it is, I'm pretty sure it's not stock from this truck.

wyoming9

iTrader: (1)

My 92 had the same thing hanging there with the wiring for the condenser fans It at one time came off the of what some people call dryers other use the term accumulator

It is a AC high pressure switch not to be confused with the dual pressure switch on the Evap coil

When the switch closes it powers the condenser fan relay number 1 coil

For what it is worth it is still on my 92 and indeed in the EWD although unplugged since the 3.4 swap.

It is also there in the 94 EWD I have no vehicle to do a visual check.

If your AC has been retro fitted and the condenser fans eliminated it would not be needed so why put a port in a AC line for something not needed

Just throw it away and be done

scope103

My '94 doesn't have a condenser fan (and judging from the lack of "high pressure switch" presumably never had one).

So, if the condenser fails to adequately cool the refrigerant, why would that change the pressure (it's continuous back to the "hot" side of the condenser)? How would a high-pressure switch control a fan? Instead, could the switch found near the receiver/accumulator (by the way it works on my '94, it's a receiver) actually be a temperature switch?

Inquiring minds want to know.

wyoming9

iTrader: (1)

You surely must know in HVAC temperature and pressure go hand in hand

Toyota calls it a pressure switch it opens and closes contacts good enough for me.

Although it looks at some point after 92 this switch was moved to the Evap coil to make it more fun to trouble shoot.

Since I don`t have a live vehicle in person I can only go by the EWD which very well could be misprinted.

millball

My 1992 3vze 4Runner has this high pressure switch in front next to the dryer.
My 1995 3vze 4Runner does not have one there.
Changes, changes, Changes.
Both are equipped with the auxillary cooling fan.

rworegon

Found it and a pic of the beast in the EPC.

88645H Switch, Pressure No. 1

http://utoyot8.com/FullImage.aspx?cc...++MAKER+OPTION

http://www.toyomotorparts.com/Page_P...3522,3523,3524

scope103

Pressure Switch No. 1 is the one inside the cooling unit. But you probably already knew that.

millball -
http://www.toyotapartsoverstock.com/ doesn't list a high-pressure switch for any model year before 2010-2011. Could you have some aftermarket parts? Like the condenser fan?

rworegon

Hmmm.

Scope, take a look at the two links in post 15. It appears from the EPC this Pressure Switch No. 1 is located right next to the Receiver and not in the cooling unit.

It appears that the Japanese production had it in one place i.e. next to the Receiver and the North American production had it in another i.e. inside the cooling unit.

millball

I just took the high pressure side piping, AC condenser, and fan off my '92 wreck the other day. I will post a pic of the switch installed in this piping tomorrow.
The fan, condenser, and piping are all very similar in construction, except for the switch, to what is on my '95 and appear to be original parts.

scope103

Ah! Got it: http://www.toyotapartsoverstock.com/...864520010.html

Apparently a "dealer option." My truck was sold (originally) in Reno, where perhaps the dealer was not as concerned about A/C (though, I always thought it could get pretty toasty in Nevada ...)

millball

Here is an image showing this switch as installed in the high pressure piping from my '92 4runner: