Speedo the speedo wants to work then it will go dead again

blower fan in dash.
fan on RAD
fan in front of ac condenser in front of car.
does the fan in dash blow , on high?????????
does it? if not say so.

the car is Corolla,
and same car.
and works same.
when the Blower dies, in the dash , the A/C will be cut off fast.(but not if blower is dead)
this is normal for blower dead. (power to it, dead )
this is to prevent icing up of the evap core (might crack it)
SPEEDO SIDE TRACKED:
are both speedo and odom are dead?
why not say so/?


rule 2, if the dash blower blows on high , its not the resistor block
proof.
below.

on high the resistor block is bypassed,
if blower works and that center fuse below blows, the AC goes dead because 12v dont make it to the the clutch relay.
if top fuse below blows, a./c and blower die. even on high.

you can see all this stuff on mitchell's, if you want. as most do.


btw , the a/c compressor may work , if the the blower has power, but the blower is burned out.
the A/C amp logic module sees the 12vdc leaving the switch and assumes the blower works.
this rule on blower on, is to keep the core from icing over, and that can bend things.
that resistor block is air cooled, and is on the fan chamber to get cooled that way, if not it burns up.
but why not tell us if the fan works on high.
that way we save 90% of all BS guessing.
why not?

first is fuses.
then if fan blows on high only, then the fan is ok and the resistor block is bad.
if blower dead on high, the blower is bad,
the fuse blown or the wires to it are bad or the switch,
what a tech does is use his voltmeter, a $10 tool.
if you have 12vdc to the motor then the fan is history, dead.
if not, 12vdc there, fan on, then you work them meter backwards until you find the open circuit.
really its that simple.
if confused ask quesitions.
if you cant test the fan on high, tell why?

1994 Trooper. 3.2 Liter engine???????????
yet another endless easte regg hunt...
can you post the symptoms first.???
speedo dead, wrong, low, too high, stuck, make noise what?
does the odometer work??????? if yes, the speed dial part is bad.
or is this the back lighting dead.?
see, we cant guess any of that.

what can i say on 1994
it's not a cable DRIVEN speedo.
i answered 2 days ago same vague question.
and will now post the same photo schematic .again.
The speed is 100% electronic.
the right wire below is power 12v
the center is ground.
the left wire is PCM speed OUTPUT.
so if the PCM has no Speed input then there will be no output
(like all computes, wrong input , wrong output.
so what is that. its the VSS sensor.
the PCM can be scanned, (ecu/ecm) did you scan it.
or do the flash codes. i bet its flashing, VSS dead. right>?
the vss is located (odometer dead)
in 1 of 3 places. (depends on your unstated drive line)
2wd, 4wd, it can be on the:
tail of transmission
tail of transfer case (4wd)
or on the rear axle pig (gear carrier top)
ever to the flash codes. code 24, DTC #24? VSS dead?
posted over 100 times.
http://www.troublecodes.net/isuzu/
its no secret how to run diag jumpers. on any car made...

most old cars have a speedo cable.
is the odometer dead too. (we need that answer now)

there are 3 class evolutionary systems.
cable
electric sender to cluster
and sender to PCM and PCM drives cluster.
but honda does this on diffr, dates than most cars. (i learned)

so lets do that. we login to alldata.com and look , so can you at any time,
once a month i do random cars.
what engine, sometimes this varies by engine, and trans.
neither stated so Ill toss coin each time.
a/t trans.
1996
has electronic (hall) speed sensor VSS and runs
engine, cruise. odometer and cluster.

the 96 has no speedo cable, and works in modern mode, very advance for this time
also any scan tool on earth fits the PCM scan port
and if VSS is dead, it tells you that with a DTC , vss dead.
saving all that work wondering why it dont work.
see/?
PCM must see it work
and cluster
and cruise
if only cluster fails, and both speedo and odometer then its bad.
if only speedo fails but not odometer , then speedo meter is bad.
its that easy.

hey and oldie but goodie.
why not post the full symptoms. ????

Speedo dead, makes noise, bounces? what? stuck high? what?
odometer dead.
CEL glows running, the check engine light glows, running
and you insert the 1cent paper clip in the DLC connector and you get
code flashing. code 24, VSS dead?
http://www.fixkick.com/CEL/CEL.html

if yes, the cable has snapped. (fell off at either end)
if not VSS dead, then the speedo is dead
if both odometer and speed are dead and VSS are dead the
snapped cable, or cable fell off rear of speedo head.
if VSS is not bad. (no 24s)
and only speedo is dead but , odometer is good
then that means the actual speedo clock inside the head is bad.

to repair a dead speed/cluster, you replace the whole head
if real frisky then you do this.
suzuki even sells new clocks, but are very expensive
what i do is find a used head. and use that. (car-parts.com) or at fleabay.
sometimes i mix 3 heads to get one, good head.
that is all you can do, on old cars unless rich, and $200 head is pocket change.

http://www.fixkick.com/sensors/speedo/unsafe-at-any-speed.html


tell more get more, ask.

LSI 4cylinder or 3cylinder? engine. , all answer USA cars.
all answers now, are 3cylinder

did the odometer quiet too?
key fact
and in USA< connect any scan tool and see if VSS died.

the usa 96, 1.0L 3cyl has the VSS sensor in the speedo
and when the cable snaps, Speedo to transaxle flex drive cable.
snamps
the speed goes dead
the odometer goes dead
and Vss goes dead.
easy huh, if all 3 are dead.
but if speedo ONLY goes dead, that means ITS dead.
vss= veh.speed sensor. or MPH sensor.

post series LC ?
post country
?, and engine size.?
then post, symptoms./??
speedo does what exactly
and odometer , yes they are related.
my wild guess, is this car has advanced cluster design.
all 100% electronic with "CAN-BUS" controls.
so in most cases of that if ONLY speedo is dead, then it is.
if VSS is dead, scan the cars PCM, if mph vss is flat lined
the Speedo and the odometer goes dead.
the VSS is what increments the odometer. (like a clock)

CLuster speedo and odometer
both dead?
cable. or drive gears in tranny tripped.
easy to check. ?
sure.
at tranny cable free, spin it same direction as speedo needle.
speedo dont work (both odometer and speed) then the cable is bad.
if not work, tranny drive gears to cable stripped out. some are plastic

sorry replace dash clocks

May be the speedometer cable is broken or possibly a fuse.

first replace your fuse if the fuse burn again there is a short circuit cause of the hit search wire that is contct to the body of your car