AC issue

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....



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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

Just for my general knowledge: where is this drain situated? I guess it runs
from the evaporator to ???

Jeroen
MX-5 Club Netherlands

| 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
|
| >
| >> 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
|
|

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.



On Sun, 24 Jun 2007 01:14:13 +0200, "Jeroen Feelders"
<http://mailto.feelders.com>  wrote:

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]

"Jeroen Feelders" <http://mailto.feelders.com>  wrote:


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


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

I'm getting this right now except that I usually find the water on my dog,
who likes to curl up down there. I still get a little water out the hose
underneath, but apparently not all of it. A left turn seems to set off a
grand slosh that dumps a glassful or so all at once.

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

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.

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 :)
rammm@dommelen.net             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

Pat wrote:

Actually, Pat, I never had that problem with Belle in the 12 years I
owned her. Don't know about the previous owner, but Belle was 17 when
she died and I never had to unclog that line.  She had nice cold AC as
well.

Iva & ?
2004 Classic Red
No more winkin' Miata

My '92 has 145,000 miles and has no clog in the tube but living in the
delightfuly pleasant summertime temperatures of Phoenix I seldom need
the refrigeration....



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XS11E, Killing all posts from Google Groups
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Iva wrote:


Hmmm, I wonder why the ones I have worked on and the one that I used to
own have it happen so regularly.

You must be casting the proper spells. :-)

It has never been a big problem, but definitely something that I have
expected to deal with on any A/C equipped NA that I own. Not sure about
the NB's and NC's.

You do keep your car a LOT cleaner than mine, that may have something to
do with it.

Pat - waiting out the rain, again.

Pat wrote:

Shhh! You'll give away all my secrets!


Erm, yes, I guess I am a bit anal about keeping my cars clean.  At
least the '04 has clear coat so I don't have to run out and drive her
off every time it rains.

Hope you're not in one of the areas that got 16" of rain in a couple
of hours yesterday.  We could use some of it up here - just not all at
once though.  Had a nice thunderstorm roll through last night and
they're forecasting a better (worse?) one for tonight - hopefully it
will take some of this humidity with it!

 Iva & Vixen
 2004 Classic Red
 No more winkin' Miata

(Oh yeah, she finally told me her name!) ;-)

Iva wrote:


A woman never gives away all of her secrets, and we wouldn't understand
most of them anyway. ;-)


"drive her off"? Was that a Freudian slip or intentional?


I am 27 miles from Marble Falls, which flooded heavily last night and it
looks like more to come.

The lake front houses around the corner are watching the water levels
very nervously.
I just want the rain to stop soon so that I can pull my Miata out from
under the tarp and fix it.


Vixen, that is cool; fast, pretty and sleek.
I won't name mine, it hurts too much when I tear them apart......

Pat

Pat wrote:

Oops!  That was supposed to be "dry" her off.  Of course, a drive to
shake off the rain drops is always fun too. ;)


I had the opportunity to buy Belle back from the wrecker but couldn't
face the thought of tearing her apart.

Iva & Vixen
2004 Classic Red
No more winkin' Miata

Iva wrote:


I am about as unsentimental as it comes with material objects, but it
did hurt to tear apart the '96M, probably because it was the best car I
have ever owned.

I was just about to replace the timing belt on that one when it was
totaled at 75,000 miles.

Pat

Dang! I have a need for a passenger fender and door (don't ask). Belle is
the right color. And you are within a reasonable driving distance. Of course
we can see what downward spiral this can be thanks to Pat.
--
Ken Lyons '97 Brilliant Black/'90 Classic Red
Inside the Beltway
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