AC issue

"Mac" > wrote
> Checked the drain and is it clear. Even took the hose off and checked
> it. Hose is located under the passenger side dash. will see it
> coming out of the evaporator. Ran the car for 15-20 minutes and the
> ac stayed on the whole time. Should it cycle on/off and if so how
> many times is normal or does it stay on all the time??? Does not
> seem like it is cycling right.
>
I am not an A/C expert, but think there is a thermostat involved that shuts
off the A/C when the temperature hits a certain point. If this thermostat is
broken, the A/C continues to work until the coils freeze up. Then it begins
blowing hot air. Once the coils unfreeze it works just fine. Until......
--
Ken Lyons '97 Brilliant Black/'90 Classic Red, both with working A/C
Inside the Beltway
[Remove the first two digits to reply]

"Frank Berger" > wrote:

>
>"pws" > wrote in message
.. .
>> miker wrote:
>>
>>>
>>> Are you saying the blockage is usually up in the under-dash unit rather
>>> than
>>> in the hose? I was going to blow air up from underneath but it sounds
>>> like
>>> taking the pipe off under the dash might be more useful.
>>>
>>> miker
>>
>> On my last Miata, I removed the tube and poked a straightened coat hanger
>> wire into the box itself where I could feel it dislodging the debris and
>> then a lot of dirty water would come out, with some of it even landing in
>> the bucket I had in place.
>>
>> I had to do this maybe 3 times over about 5 or 6 years. I could have
>> removed the box and cleared the debris, but that it a fairly involved job.
>>
>> BTW, the drain tube itself was never blocked in my experience, it was
>> always the debris in the plastic box where the tube attaches, with this
>> car and on at least 3 other NA Miatas that I have unblocked.
>>
>> Pat
>
>Going on 11 years for me. Haven't had a problem. Curious.

I assume you do not park under trees in Florida.

Leon
--
Leon van Dommelen Bess, the Miata Bozo, the Miata
http://www.dommelen.net/miata
The only thing better than a white Miata is two white Miatas

Seemed like it wored better today. I did poke up in the drain hole
but not if lossen anything or not. Will continue to check it more.
Thanks for all the info. If have any other problems will check the
thermostat.


On Mon, 25 Jun 2007 21:10:57 GMT, "miker"
> wrote:

>> On my last Miata, I removed the tube and poked a straightened coat
>> hanger wire into the box itself where I could feel it dislodging the
>> debris and then a lot of dirty water would come out, with some of it
>> even landing in the bucket I had in place.
>
>Ok, that was dead easy. Pull the tube off (no clamp or anything), poke a)
>stubby screwdriver; b) section of coathanger; c) hex key up there... as you
>say, I could feel almost a little crust I broke thru and water started
>draining. I caught most of it with a towel before realizing I coulda just
>put the dem tube back on.
>
>miker
>
>

>>
>>Going on 11 years for me. Haven't had a problem. Curious.
>
> I assume you do not park under trees in Florida.
>
> Leon
> --
> Leon van Dommelen Bess, the Miata Bozo, the Miata
> http://www.dommelen.net/miata
> The only thing better than a white Miata is two white Miatas

I'm thinking the bits of leaves get in thru the cowl at the base of the
windshield. There's screen type of protection but with leaves drying and
crunching up into small bits well, you know. They seem to make their way
from there. I doubt 'garaged' miatas will ever have a problem.

Chris
99BBB

Well, I actually own a 91 Miata with AC and haven't noticed the drain
before. Can't find it in the Workshop Manual too. Allthough I haven't got
any problems with my AC I'll crawl underneath the glove compartment soon and
have a look...

Jeroen

"Leon van Dommelen" > schreef in bericht
...
| "Jeroen Feelders" <http://mailto.feelders.com> wrote:
|
| >Just for my general knowledge: where is this drain situated? I guess it
runs
| >from the evaporator to ???
|
| I guess you still don't have many AC in the Netherlands. There is a short
| rubber hose that runs from behind the glove compartment to the
transmission
| tunnel, passenger side of course. People with NA cars with AC get used to
| finding water on the floor at the passenger side and taking out the hose
to
| unclog the exit of the evaporator enclosure behind the glove compartment
| by poking with a screwdriver.
|
| Leon
|
| >Jeroen
| >MX-5 Club Netherlands
| >
| >"Chris D'Agnolo" > schreef in bericht
| .. .
| >| I've dealt with this issue on several cars. Each time it's been the
same
| >| thing; the drain on the reservoir that the ac dumps the humidity into,
| >clogs
| >| up and the reservoir gets full. AC quits working. Often times (but not
| >| always) combined with soaking the carpets in the floorboards from
| >| 'sloshing'.
| >|
| >| Try this; car up on jack stands, running, ac on, (assuming it's not
| >| working), try running a wire up thru the drain hose from under the car.
| >You
| >| know, the one that normally drips when the ac is running. Often times
| >you'll
| >| be able to nudge some debris out of the way and the water will come
| >rushing
| >| out (smelling like you-know-what! If this works, at least you've
| >identified
| >| the problem. I haven't removed this and cleaned it out on a miata. Some
| >cars
| >| it's easy, others, it's a royal pain. Alternative; try to suck the
debris
| >| out with a shop vac and some creative hose adapters ;-)
| >|
| >| Keep us posted,
| >| Chris
| >| 99BBB
| >|
| >| "XS11E" > wrote in message
| >| . 184...
| >| > Mac > wrote:
| >| >
| >| >> Have a question on the ac system on the Miata. Have a 90 with
| >| >> r12. Took it in and the pressure is good and has the correct
| >| >> amount of freon. But after 20-30 minutes of driving it stops
| >| >> working and starts to blow hot air, but then will come back on
| >| >> after a few minutes. Also, sometimes the rpms goes up to over 1500
| >| >> to 2000 while at idle, stopped at a red light and such. Any
| >| >> ideas? Finding it hard to take it to a place that I trust and
| >| >> want to be able to go in and at least have some idea what might be
| >| >> wrong.
| >| >
| >| > I've no idea, I have the same AC problem but not the idle speed
problem
| >| > on my Jeep. Could possibly be known problem on the '93 Grand
Cherokee,
| >| > the computer fails to send a signal to turn off the compressor when
it
| >| > should and the unit ices up. I doubt there's anything similar on the
| >| > Miata but who knows?
| >| >
| >| > I also had a similar problem on the Miata two years ago, AC was
cooling
| >| > just fine and then started blowing hot, like the compressor was
turned
| >| > off. Next time I drove, same thing, no AC.
| >| >
| >| > I suspected low freon causing the pressure switch to stop the
| >| > compressor. I took it in and they said it wasn't leaking but added a
| >| > can of dye.
| >| >
| >| > A few days later, it stopped again but when I stopped the car it
worked
| >| > when I started it again and...... it's never failed since! Go
figure.
| >| > BTW, the dye showed no leaks.
| >| >
| >| > I really doubt any of the above will help you any, sorry. Isn't
there
| >| > anyone you know that can recommend a shop? That's probably the best
| >| > way to find a good one....
| >| >
| >| >
| >| >
| >| > --
| >| > XS11E, Killing all posts from Google Groups
| >| > The Usenet Improvement Project: http://blinkynet.net/comp/uip5.html
| >|
| >|
| >
| --
| Leon van Dommelen Bess, the Miata Bozo, the Miata
| http://www.dommelen.net/miata
| The only thing better than a white Miata is two white Miatas

> I doubt 'garaged' miatas will ever have a problem.

Mine has been garaged its whole life, so there's one exception. Very seldom
do I get leaves on it.

miker

Frank Berger wrote:

> Going on 11 years for me. Haven't had a problem. Curious.


Whatever you are doing, keep doing it.
That is the longest I have ever heard of an AC-equipped NA Miata going
without having this happen.

I am assuming that it is not from lack of use in Texas. :-)

Pat

miker wrote:

> Ok, that was dead easy. Pull the tube off (no clamp or anything), poke a)
> stubby screwdriver; b) section of coathanger; c) hex key up there... as you
> say, I could feel almost a little crust I broke thru and water started
> draining. I caught most of it with a towel before realizing I coulda just
> put the dem tube back on.
>
> miker

Excellent, I never thought to quickly put the tube back on, that is far
too sensible.

I really wish that I had this problem to deal with right now.

As nice as it is not to have to worry about replacing an AC compressor,
freon, etc., that cool air is kind of nice as well.

Pat

miker wrote:
>> I doubt 'garaged' miatas will ever have a problem.
>
> Mine has been garaged its whole life, so there's one exception. Very seldom
> do I get leaves on it.
>
> miker

I bought my last miata as a garage queen at 3 years old and 10,000
miles. It still clogged up within the year, though that was parking
outside once I owned it.

I am not disbelieving Frank for a second, but 11 years, wow.

What year is your's again, miker?

Pat

Seemed to work fine today driving home in near 90 temp. And have the
nice puddle of water under the car when stopped. maybe it was clogged
some. Will keep checking and clean it out more this weekend. thanks
for all the help and discussion on this matter.


On Tue, 26 Jun 2007 09:19:59 +0200, "Jeroen Feelders"
<http://mailto.feelders.com> wrote:

>Well, I actually own a 91 Miata with AC and haven't noticed the drain
>before. Can't find it in the Workshop Manual too. Allthough I haven't got
>any problems with my AC I'll crawl underneath the glove compartment soon and
>have a look...
>
>Jeroen
>
>"Leon van Dommelen" > schreef in bericht
.. .
>| "Jeroen Feelders" <http://mailto.feelders.com> wrote:
>|
>| >Just for my general knowledge: where is this drain situated? I guess it
>runs
>| >from the evaporator to ???
>|
>| I guess you still don't have many AC in the Netherlands. There is a short
>| rubber hose that runs from behind the glove compartment to the
>transmission
>| tunnel, passenger side of course. People with NA cars with AC get used to
>| finding water on the floor at the passenger side and taking out the hose
>to
>| unclog the exit of the evaporator enclosure behind the glove compartment
>| by poking with a screwdriver.
>|
>| Leon
>|
>| >Jeroen
>| >MX-5 Club Netherlands
>| >
>| >"Chris D'Agnolo" > schreef in bericht
>| .. .
>| >| I've dealt with this issue on several cars. Each time it's been the
>same
>| >| thing; the drain on the reservoir that the ac dumps the humidity into,
>| >clogs
>| >| up and the reservoir gets full. AC quits working. Often times (but not
>| >| always) combined with soaking the carpets in the floorboards from
>| >| 'sloshing'.
>| >|
>| >| Try this; car up on jack stands, running, ac on, (assuming it's not
>| >| working), try running a wire up thru the drain hose from under the car.
>| >You
>| >| know, the one that normally drips when the ac is running. Often times
>| >you'll
>| >| be able to nudge some debris out of the way and the water will come
>| >rushing
>| >| out (smelling like you-know-what! If this works, at least you've
>| >identified
>| >| the problem. I haven't removed this and cleaned it out on a miata. Some
>| >cars
>| >| it's easy, others, it's a royal pain. Alternative; try to suck the
>debris
>| >| out with a shop vac and some creative hose adapters ;-)
>| >|
>| >| Keep us posted,
>| >| Chris
>| >| 99BBB
>| >|
>| >| "XS11E" > wrote in message
>| >| . 184...
>| >| > Mac > wrote:
>| >| >
>| >| >> Have a question on the ac system on the Miata. Have a 90 with
>| >| >> r12. Took it in and the pressure is good and has the correct
>| >| >> amount of freon. But after 20-30 minutes of driving it stops
>| >| >> working and starts to blow hot air, but then will come back on
>| >| >> after a few minutes. Also, sometimes the rpms goes up to over 1500
>| >| >> to 2000 while at idle, stopped at a red light and such. Any
>| >| >> ideas? Finding it hard to take it to a place that I trust and
>| >| >> want to be able to go in and at least have some idea what might be
>| >| >> wrong.
>| >| >
>| >| > I've no idea, I have the same AC problem but not the idle speed
>problem
>| >| > on my Jeep. Could possibly be known problem on the '93 Grand
>Cherokee,
>| >| > the computer fails to send a signal to turn off the compressor when
>it
>| >| > should and the unit ices up. I doubt there's anything similar on the
>| >| > Miata but who knows?
>| >| >
>| >| > I also had a similar problem on the Miata two years ago, AC was
>cooling
>| >| > just fine and then started blowing hot, like the compressor was
>turned
>| >| > off. Next time I drove, same thing, no AC.
>| >| >
>| >| > I suspected low freon causing the pressure switch to stop the
>| >| > compressor. I took it in and they said it wasn't leaking but added a
>| >| > can of dye.
>| >| >
>| >| > A few days later, it stopped again but when I stopped the car it
>worked
>| >| > when I started it again and...... it's never failed since! Go
>figure.
>| >| > BTW, the dye showed no leaks.
>| >| >
>| >| > I really doubt any of the above will help you any, sorry. Isn't
>there
>| >| > anyone you know that can recommend a shop? That's probably the best
>| >| > way to find a good one....
>| >| >
>| >| >
>| >| >
>| >| > --
>| >| > XS11E, Killing all posts from Google Groups
>| >| > The Usenet Improvement Project: http://blinkynet.net/comp/uip5.html
>| >|
>| >|
>| >
>| --
>| Leon van Dommelen Bess, the Miata Bozo, the Miata
>| http://www.dommelen.net/miata
>| The only thing better than a white Miata is two white Miatas
>