95 corolla a/c button flashes 1.6L

The a/c quit working on my corolla, when I push
the a/c button on, it flashes for just a second
then goes off. The compressor and fans don't come
on. I tested the fans and compressor and they work when I jumped 12V to
them. Fuses good. Why
does the button flash on then off. I checked freon level-ok. Is there a
way to check the amplifier? I don't have a schematic. Did I miss
something? Any ideas?

"goldy9955" <g.g.diaz@att.net> wrote in message
news:5ff89a360a9547cb0cba8857ceb32aa8@localhost.talkaboutautos.com...[color=blue]
> The a/c quit working on my corolla, when I push
> the a/c button on, it flashes for just a second
> then goes off. The compressor and fans don't come
> on. I tested the fans and compressor and they work when I jumped 12V to
> them. Fuses good. Why
> does the button flash on then off. I checked freon level-ok. Is there a
> way to check the amplifier? I don't have a schematic. Did I miss
> something? Any ideas?
>[/color]

A flashing A/C button means that the system has detected a difference
between compressor and engine RPM and has disengaged the compressor clutch.
Check to make sure that the compressor drive belt is not slipping. If not,
then check the RPM sensor on the compressor to make sure a signal is coming
out.
--

Ray O
(correct punctuation to reply)

It means the R134a level is either too high or too low. Go to an AC shop ...




"goldy9955" <g.g.diaz@att.net> wrote in message
news:5ff89a360a9547cb0cba8857ceb32aa8@localhost.talkaboutautos.com...[color=blue]
> The a/c quit working on my corolla, when I push
> the a/c button on, it flashes for just a second
> then goes off. The compressor and fans don't come
> on. I tested the fans and compressor and they work when I jumped 12V to
> them. Fuses good. Why
> does the button flash on then off. I checked freon level-ok. Is there a
> way to check the amplifier? I don't have a schematic. Did I miss
> something? Any ideas?
>[/color]

Hey Ray O, I checked for the clutch speed sensor
and there is no sensor on the compressor. It has
only 1 wire going to the clutch.I did'nt find an engine rpm sensor either.
It has a distributor. By the way, a sticker on the hood says its a 1.8L,
is there a difference? It has a 4 wire pressure switch on the high side
line going into the evaporator all different colors. I'll keep looking.
Thanks.

"goldy9955" <g.g.diaz@att.net> wrote in message
news:642dd4c1f57c7a1f7a23d8da618e0aad@localhost.talkaboutautos.com...[color=blue]
> Hey Ray O, I checked for the clutch speed sensor
> and there is no sensor on the compressor. It has
> only 1 wire going to the clutch.I did'nt find an engine rpm sensor either.
> It has a distributor. By the way, a sticker on the hood says its a 1.8L,
> is there a difference? It has a 4 wire pressure switch on the high side
> line going into the evaporator all different colors. I'll keep looking.
> Thanks.
>[/color]

The 93-95 Corollas (Generation 10 or AE10x) came with 2 motors. 4Y (1.6)
and 7Y(1.8) 3 transmissions, 5-speed manual and 3 and 3+OD auto trannies.
Between my sister and myself we own 3 of the 1.8 w. 3+OD transmissions. It
should be identified as part of the VIN.

Charles of Schamuburg

"goldy9955" <g.g.diaz@att.net> wrote in message
news:642dd4c1f57c7a1f7a23d8da618e0aad@localhost.talkaboutautos.com...[color=blue]
> Hey Ray O, I checked for the clutch speed sensor
> and there is no sensor on the compressor. It has
> only 1 wire going to the clutch.I did'nt find an engine rpm sensor either.
> It has a distributor. By the way, a sticker on the hood says its a 1.8L,
> is there a difference? It has a 4 wire pressure switch on the high side
> line going into the evaporator all different colors. I'll keep looking.
> Thanks.
>[/color]

The RPM sensor is not on the clutch, it is on the compressor itself.
Disconnect the electrical harness going to the compressor itself - I think
it has 4 wires. On the pigtail coming out of the compressor, measure the
resistance between the top 2 terminals closest to the locking tab on the
connector. Resistance should be between 165 and 205 ohms.

I think there is a sight glass on top of the receiver/drier in front of the
evaporator. When you look into the glass with the compressor engaged, it
should look like clear water flowing past, with very few bubbles. If you
see foam or nothing flowing past then the refrigerant charge is too low and
needs to be recharged. Low refrigerant levels will keep the compressor from
engaging.
--

Ray O
(correct punctuation to reply)

The corolla is a DX 1.8 with a 3 speed auto-no OD.
I pulled out the engine/trans about 2 years ago when I rebuilt the trans.
I checked the compressor and there is no 4 wire plug, only a blk/red wire.
I applied voltage to it and the clutch engaged. The rec/dryer is located
in front of the condensor on the battery side. I tested the ac when I
engaged the clutch for about
1 minute, it cools normally and full of l34A. I'm
about 10 miles from the Mexican border here in S.
Texas and it was 94 degrees today. Gotta get it
going soon. Thanks.

"goldy9955" <g.g.diaz@att.net> wrote in message
news:24bf1708a6088447a9961329732f7ec7@localhost.talkaboutautos.com...[color=blue]
> The corolla is a DX 1.8 with a 3 speed auto-no OD.
> I pulled out the engine/trans about 2 years ago when I rebuilt the trans.
> I checked the compressor and there is no 4 wire plug, only a blk/red wire.
> I applied voltage to it and the clutch engaged. The rec/dryer is located
> in front of the condensor on the battery side. I tested the ac when I
> engaged the clutch for about
> 1 minute, it cools normally and full of l34A. I'm
> about 10 miles from the Mexican border here in S.
> Texas and it was 94 degrees today. Gotta get it
> going soon. Thanks.
>[/color]

Hmmm....

The engine and transmission should not have any bearing on the flashing A/C
light unless the pulley diameter on the engine and/or compressor is
incorrect. If the A/C worked for a while, then this is not the case.

AFAIK, the only thing that makes the A/C light flash is if the RPM sensor on
the compressor detects a different speed from engine RPM and it has
de-energized the compressor clutch. This sometimes happens when you drive
through big puddles and water makes the compressor drive belt slip. It will
also happen if the drive belt slips or fails or something in the compressor
is causing too much resistance. Cycling the A/C off and back on will turn
the A/C back on unless the condition still exists or there is something
wrong with the compressor RPM sensor.

It is hard for me to imagine that there is no RPM sensor on a modern Toyota
A/C compressor. If you have run your hands completely around every surface
of the compressor, including the underside and back side without finding any
other electrical connections besides the clutch, then the system on your car
uses some other method for determining compressor RPM that I am not familiar
with. BTW, changing the RPM sensor on the compressor usually requires
discharging the system and removal of the compressor.

Check the compressor drive belt to make sure it is not slipping or glazed.
If there is more than 30,000 miles on the belt, it wouldn't hurt to change
it.

You have mentioned a couple of times that the system is full of 134A. Did
you verify this through the sight glass or with gauges or are you assuming
this because the system cools when the compressor is engaged? The correct
way to verify this is through the sight glass or with gauges. In any event,
if refrigerant levels are low, the low pressure switch will keep the clutch
from engaging but it will not make the A/C button flash unless the oil that
is mixed with the refrigerant is low and the compressor is seizing.

The Chicago area is also expecting a heat wave of sorts - the temps are
supposed to reach the 50's this week!
--

Ray O
(correct punctuation to reply)

The flashing light on the AC Button means the pressure switch on the high
side is shutting the system down. Either the pressure is wrong, or the
switch is toast. See an AC specialist if you can't test this stuff yourself.

I once thought that I could service my AC system, and messed it up. All I
lost was the time and material to make the mistake; it would have cost the
same to do the service had I gone to the shop in the first place.



"goldy9955" <g.g.diaz@att.net> wrote in message
news:642dd4c1f57c7a1f7a23d8da618e0aad@localhost.talkaboutautos.com...[color=blue]
> Hey Ray O, I checked for the clutch speed sensor
> and there is no sensor on the compressor. It has
> only 1 wire going to the clutch.I did'nt find an engine rpm sensor either.
> It has a distributor. By the way, a sticker on the hood says its a 1.8L,
> is there a difference? It has a 4 wire pressure switch on the high side
> line going into the evaporator all different colors. I'll keep looking.
> Thanks.
>[/color]

"Jeff Strickland" <crwlr@yahoo.com> wrote in message
news:d-KdnRDuLLEQoZPZRVn-hQ@ez2.net...[color=blue]
> The flashing light on the AC Button means the pressure switch on the high
> side is shutting the system down. Either the pressure is wrong, or the
> switch is toast. See an AC specialist if you can't test this stuff
> yourself.
>[/color]

On every Toyota I am familiar with, the flashing light on the AC button does
not have anything to do with the pressure switch; it means that the system
has detected a difference in compressor and engine RPM. Does the 95 Corolla
have a different system?

--

Ray O
(correct punctuation to reply)[color=blue]
> I once thought that I could service my AC system, and messed it up. All I
> lost was the time and material to make the mistake; it would have cost the
> same to do the service had I gone to the shop in the first place.
>[/color]


[color=blue]
>
> "goldy9955" <g.g.diaz@att.net> wrote in message
> news:642dd4c1f57c7a1f7a23d8da618e0aad@localhost.talkaboutautos.com...[color=green]
>> Hey Ray O, I checked for the clutch speed sensor
>> and there is no sensor on the compressor. It has
>> only 1 wire going to the clutch.I did'nt find an engine rpm sensor
>> either.
>> It has a distributor. By the way, a sticker on the hood says its a 1.8L,
>> is there a difference? It has a 4 wire pressure switch on the high side
>> line going into the evaporator all different colors. I'll keep looking.
>> Thanks.
>>[/color]
>[/color]

"Ray O" <rokigawa@tristarassociatesDOTcomn> wrote in message
news:2a6de$440e5fa1$180fead6$26516@msgid.meganewsservers.com...[color=blue]
>
> "Jeff Strickland" <crwlr@yahoo.com> wrote in message
> news:d-KdnRDuLLEQoZPZRVn-hQ@ez2.net...[color=green]
>> The flashing light on the AC Button means the pressure switch on the high
>> side is shutting the system down. Either the pressure is wrong, or the
>> switch is toast. See an AC specialist if you can't test this stuff
>> yourself.
>>[/color]
>
> On every Toyota I am familiar with, the flashing light on the AC button
> does not have anything to do with the pressure switch; it means that the
> system has detected a difference in compressor and engine RPM. Does the
> 95 Corolla have a different system?
>[/color]

Unknown.

I was not aware that the AC had a tach on it. In every instance of a
flashing light, it meant there was an issue with pressure. In any case, the
AC Technician should know what a flashing light means, and the OP should pay
him a visit.

"Jeff Strickland" <crwlr@yahoo.com> wrote in message
news:SPadnalhdIZ2qZLZRVn-pw@ez2.net...[color=blue]
>
> "Ray O" <rokigawa@tristarassociatesDOTcomn> wrote in message
> news:2a6de$440e5fa1$180fead6$26516@msgid.meganewsservers.com...[color=green]
>>
>> "Jeff Strickland" <crwlr@yahoo.com> wrote in message
>> news:d-KdnRDuLLEQoZPZRVn-hQ@ez2.net...[color=darkred]
>>> The flashing light on the AC Button means the pressure switch on the
>>> high side is shutting the system down. Either the pressure is wrong, or
>>> the switch is toast. See an AC specialist if you can't test this stuff
>>> yourself.
>>>[/color]
>>
>> On every Toyota I am familiar with, the flashing light on the AC button
>> does not have anything to do with the pressure switch; it means that the
>> system has detected a difference in compressor and engine RPM. Does the
>> 95 Corolla have a different system?
>>[/color]
>
> Unknown.
>
> I was not aware that the AC had a tach on it. In every instance of a
> flashing light, it meant there was an issue with pressure. In any case,
> the AC Technician should know what a flashing light means, and the OP
> should pay him a visit.
>[/color]

On Toyotas with low refrigerant levels, there is no flashing light.
--

Ray O
(correct punctuation to reply)

Hey guys, I've been checking the wiring and found
some melted wires on 2 pigtails that plug into the
main fuse/relay box. Gotta correct that before
going any further. No blown fuses! If this does'nt fix it, I'm going to
the dealer. Thanks guys. goldy9955

goldy9955 <g.g.diaz@att.net> wrote:[color=blue]
> The corolla is a DX 1.8 with a 3 speed auto-no OD.[/color]

The DX is a 1.8L with 4spd. The standard model is a 1.6L with 3spd.

I'm pretty sure your combination was never sold new in the North America.