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water swishing in dash,A/C not draining-help


LittleRascal
08-22-2004, 09:42 PM
Lately I have noticed that after using my A/C I hear water swishing around. The sound seems to coming from the lower part of my dash. It seems to me that I am not seeing a normal amount of condensation draining from the condensor. Is there a hole that could be clogged. I looked around and didn't see anything obvious. Any help would be appreciated.

mlemon
08-26-2004, 09:14 AM
I also have a gurgling sound, under the passenger side dash, that I've been thinking is the heater core being air locked. (this idea started last winter when my heater was not hot enough) haven't considered any connection to the ac, even though I didn't start hearing it until a.c. weather. hope we find the answer.

89s10pu
09-04-2004, 02:24 AM
You both most likely have a low coolant problem. We had the problem in our '96 4 door blazer for the last year. Getting the cooling system flushed helped for a little while until I discovered a 3 inch long crack in the radiator. I replaced the radiator and haven't heard anything since, not to mention it hasn't tried to overheat with the air conditioner on either.

BlazerLT
09-04-2004, 06:24 PM
Lately I have noticed that after using my A/C I hear water swishing around. The sound seems to coming from the lower part of my dash. It seems to me that I am not seeing a normal amount of condensation draining from the condensor. Is there a hole that could be clogged. I looked around and didn't see anything obvious. Any help would be appreciated.

LittleRascal,

Do this for a test. Go out to the truck after letting it sit overnight and take the rad cap off with the engine cold and the engine off.

Tell me if the coolant is right up to the top or not?

If it is not and your coolant overflow tank is is up to the right level, you need to replace you rad cap with one from the parts store.

Very cheap and will fix the problem.

Also, when the engine is warm, where is the temperature at on the gauge?

busa_4
09-04-2004, 08:57 PM
if you hear this water sloshing around when your a/c is on then most likely your hvac drains are clogged. look under the car and check to see if you have any hoses or passages under the vehicle. clean them out with a hanger or whatever you can find. also check the drains under the cowl panel (where your wipers are) there should be a few more body drains. i have seen these clogged to a point where water will fill in the hvac unit so high it will leak onto the passenger floor.

BlazerLT
09-04-2004, 09:04 PM
Running Water noise under the passenger side of the dash is from the heater core, not the HVAC system.

It is a common problem on s-series and can be fixed by replacing the rad cap.

The rad cap is not sealing properly and sucking air into the rad when it should be taking coolant from the overflow tank to keep itself topped up. This lead to air being forced into the cooling system which usually lead to air being introduced in the heater core.

I just had this problem a month ago.

$3 rad cap and the engine runs cooler and the running water noise is gone.

busa_4
09-05-2004, 07:35 PM
heater core is part of the hvac system.
hvac= heating ventilation and air conditioning

BlazerLT
09-05-2004, 08:14 PM
Me dumdum.

My bad.

LittleRascal
10-07-2004, 10:12 PM
Thanks to all for your input. The water level on the radiator is right to the top when I checked it. The temp guage is pretty steady just around 190-200. I replaced the radiator cap anyway. cleaned out all of the drain holes I could find. The noise is still there - only when I am running he A/C. Here's where I am with this - the weather is fixed so I can stupidly go along for a few month with my problem 'fixed'. In the spring, before it gets too hot, I will hit an A/C shop or a Chevy dealer - oh the money I will waist.
Thanks again. I will keep checking the responses and try anything that looks promising and seems reasonable.

Little Rascal

Fireplug
10-08-2004, 05:54 PM
I had 1 that had a problem like yours.
First off is the A/C blowing ice cold air? 2nd if it is does the a/c compresser cycle on and off while driving or sitting at idle ?? do you get any smell with the a/c on??
Do you get this noise when making a turn or all the time or when ever it fells like it??
Is the floor wet under the dash at all??
I had 1 that sounded like water under the dash with the a/c on and it turned out to be a clogged
a/c line that held back enough freeon to let it change from gas to a liquid just like the old orifice tube type.
The real kick was the dam a/c blow out snowballs.
Just that dam water sound under the dash.
OR
I have also see where the a/c compressor will not cycle and freeze the evaperator and water would build up because the ice covered the drain but when you go to look at it the ice melts leaving you scratching you head!!
Fireplug

SWEATBREAD
10-08-2004, 07:55 PM
This Noise Comes From An Air Trapped Inj The Heater Core, To Correct The Issue You Can Completley Drain The Coolant System And Draw A Vaccum On The Coolant System. The Use The Vaccum To Refill The Coolant System 100%. ( They Are Right About To Replace The Radiator Cap) If This Does Not Work Are You Do Not Have A Access To A Coolant System Vaccum Pump You Will Have To Replace The Heater Core.

LittleRascal
10-08-2004, 10:22 PM
Fireplug and Sweatbread - thanks - you both may be right - here's the deal. I have every symptom that Fireplug had. When the a/c has been on for more than a few minutes you start hearing the noise, you don't see any condesation hitting the ground and there is a little bit of a musty type of smell. Leave in sit for a few minutes and there is a large buddle from condensation on the ground. Now for Sweatbread - after reading your response I realized that all of this started to be noticable after I flushed the coolant system (without a system vacumn). Maybe I have two problems. I will the vacumn system on the coolant system first. The main reason - compressors not cycling, etc. is a little more expensive. I try to conserve my money and do as much as I can on my own.

Thanks to both of you - I will post something when I finish the recommended steps or solve the problem.

BlazerLT
10-11-2004, 08:56 PM
This Noise Comes From An Air Trapped Inj The Heater Core, To Correct The Issue You Can Completley Drain The Coolant System And Draw A Vaccum On The Coolant System. The Use The Vaccum To Refill The Coolant System 100%. ( They Are Right About To Replace The Radiator Cap) If This Does Not Work Are You Do Not Have A Access To A Coolant System Vaccum Pump You Will Have To Replace The Heater Core.

It is a pressureized system and it bleeds itself.

dmbrisket 51
10-16-2004, 11:45 PM
two words, vacume seal, its way the hell behind your dash, by the firewall, have fun

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