A/C Works Then Causes Temp Gauge To Rise!!! - Chevy Impala SS Forum
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post #1 of 26 (permalink) Old 06-19-2018, 12:18 PM Thread Starter
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Question A/C Works Then Causes Temp Gauge To Rise!!!

Wassup to the Gang!!! I've been studying the A/C system for these cars for a while & cant get a break. So far I've changed everything listed fairly new or a year old.Using Auto Zone (San tech AC Compressor Kit LTW always comes with New Accumulator and PAG Oil) Condenser, AC/Lines, Blower Motor, Resistor, and Orifice Tube expect the Evaporator. About 2 Years I had watched someone charge & e vac the A/C system using the manifold and it was super cold then it slowly leaked as compressor would turn off and on. I then swapped out the compressor @ AZ thinking there was a problem. I know more now then I did then as well as parts, Now the issue is the compressor engages fine but tends to blow cold for a while before causing temp to rise close to the "H" Mark. Also makes it hot in car which will result into rolling down window, to let gauge keep from overheating. After a hour or so can continue with A/C into problem reoccurs. I've been using the refrigerant at Walmart for $4.88 a can I know we require 1.75 lbs of Freon 28 oz approximately 3 cans. Besides no changing the evap what seems to be the problem? I have all the tools needed to proper service A/C besides recovery tank. Harbor Freight A/C Gauge & a Vacuum Pump works fine.

https://www.autozone.com/cooling-hea...79589_576006_0

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post #2 of 26 (permalink) Old 06-19-2018, 02:15 PM
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What year car?


Quote:
I've been using the refrigerant at Walmart
Is it 134 or 134a?


If all electric fans do they turn freely? They should spin after key off for a second or two. Safely hand turn them hot and cold. There should be no noise. They should turn freely.


Do both fans run?


If you have a mechanically powered fan does it make more noise when you overheat? Does it have a fan shroud?



Do you have the splash shields(front under car air dam, skirt) or is it missing.

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post #3 of 26 (permalink) Old 06-19-2018, 06:20 PM Thread Starter
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Would The Freon make a difference?

It's a 1994 Chevy Caprice 5.7L. I've been using this Super Tech Refrigerant R-134a. What's the difference between 134a & 134?


Both fans work have setup to run once keys are in Acc.


No splash shields that I see under car I am missing cover on passenger side by Charcoal canister. Where's the Air Dam?

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Last edited by Dae1; 06-19-2018 at 06:35 PM. Reason: Typo
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post #4 of 26 (permalink) Old 06-19-2018, 10:59 PM
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134a no problem.

Look for the skirt air dam or whatever you want to call it under the front bumper.
It will look sorta like the picture.It is made of three parts. In your environment you need all parts.


If it is missing it may cause the car to run hotter. Probably not your main problem.


I know little about the AC system but if your radiator and condenser do not get enough air flow you will have problems.
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post #5 of 26 (permalink) Old 06-20-2018, 09:12 AM
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Quote:
Originally Posted by Z09B4U View Post
Look for the skirt air dam or whatever you want to call it under the front bumper.
It will look sorta like the picture.It is made of three parts. In your environment you need all parts.


If it is missing it may cause the car to run hotter. Probably not your main problem.

I drove my 1994 9C1 Caprice every day for 17 years in Detroit's bumper to bumper traffic without the air dam ever being on there and it never overheated once so it is not really that big of a deal for it to be missing.


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post #6 of 26 (permalink) Old 06-20-2018, 10:07 AM
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With respect I would not compare Michigan with Arizona. Their lowest average temperature in January is higher that your highest. Their average high is over 85F for six months of the year, Michigan's average highest is 83F for a month.


Detroit

Month Low High
Jan 17.8F 31.1F
Feb 20.0F 34.4F
Mar 28.5F 45.2F
Apr 38.4F 57.8F
May 49.4F 70.2F
Jun 58.9F 79.0F
Jul 63.6F 83.4F
Aug 62.2F 81.4F
Sept 54.1F 73.7F
Oct 42.5F 61.2F
Nov 33.5F 47.8F
Dec 23.4F 35.9F







Tucson:
Month Low High
Jan 38.9F 64.5F
Feb 41.6F 68.4F
Mar 45.1F 73.3F
Apr 50.5F 81.5F
May 58.6F 90.4F
Jun 68.0F 100.2F
Jul 73.4F 99.6F
Aug 72.4F 97.4F
Sept 67.7F 94.0F
Oct 57.0F 84.0F
Nov 45.1F 72.3F
Dec 39.2F 64.6F

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post #7 of 26 (permalink) Old 06-20-2018, 10:33 AM
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Okay, I live in a similar environment, so I may be able to help.

To start:

1. Do you have access to a diagnostic dongle or some other device where you can actually monitor true temperatures the PCM see from the sending unit in the water pump?
*Granted the dash gauge sending unit in the RH cylinder head is good, and you certainly shouldn't see the gauge going to the "H" position, but being able to see actual PCM temperatures would verify whether you are ~actually~ running hot.
*If so, what is the temperature?

2. Do you have the flexible rubber pieces installed at the front of the condenser on each side?

3. What thermostat is installed; how old is it?

4. Where is the fluid level in the overflow tank? It should be level with the piece that runs from left to right at the fill opening.

5. Do both cooling fans engage when the A/C is engaged?

6. What are the high and low side A/C pressures at what ambient temperature and humidity percentage?

7. Has the PCM been reprogrammed to lower the temperatures at which the cooling fans turn ON/OFF?
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post #8 of 26 (permalink) Old 06-20-2018, 11:29 AM
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Quote:
Originally Posted by Z09B4U View Post
With respect I would not compare Michigan with Arizona. Their lowest average temperature in January is higher that your highest. Their average high is over 85F for six months of the year, Michigan's average highest is 83F for a month.


Detroit

Month Low High
Jan 17.8F 31.1F
Feb 20.0F 34.4F
Mar 28.5F 45.2F
Apr 38.4F 57.8F
May 49.4F 70.2F
Jun 58.9F 79.0F
Jul 63.6F 83.4F
Aug 62.2F 81.4F
Sept 54.1F 73.7F
Oct 42.5F 61.2F
Nov 33.5F 47.8F
Dec 23.4F 35.9F







Tucson:
Month Low High
Jan 38.9F 64.5F
Feb 41.6F 68.4F
Mar 45.1F 73.3F
Apr 50.5F 81.5F
May 58.6F 90.4F
Jun 68.0F 100.2F
Jul 73.4F 99.6F
Aug 72.4F 97.4F
Sept 67.7F 94.0F
Oct 57.0F 84.0F
Nov 45.1F 72.3F
Dec 39.2F 64.6F

And this statement is supposed to some how invalidate what I said? I think not! The point was you can drive without an air dam and not overheat!


And just to add clarity I drove my Caprice without the air dam from Detroit to Oklahoma and then drove to Las Vegas and went to a police car auction and purchased 22 Caprices and shipped them back east. I then drove on to Tucson Arizona to visit a friend and it was 118 degrees in Tucson and 123 degrees in Phoenix while I was there and my car did NOT overheat! But what do I know?


Mike--94MSP9C1

Last edited by 94MSP9C1; 06-20-2018 at 12:23 PM. Reason: Clarify
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post #9 of 26 (permalink) Old 06-20-2018, 11:31 AM
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Quote:
5. Do both cooling fans engage when the A/C is engaged?
7. Has the PCM been reprogrammed to lower the temperatures at which the cooling fans turn ON/OFF?
juniorwatson


Quote:
Both fans work have setup to run once keys are in Acc.
Dae1


I interpreted this to mean the fans run at all times the key is in run. All accessory power is active when the key is in RUN.



Quote:
If it is missing it may cause the car to run hotter. Probably not your main problem.
Z09B4U

Quote:
The point was you can drive without an air dam and not overheat!
Mike--94MSP9C1

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Last edited by Z09B4U; 06-20-2018 at 11:39 AM.
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post #10 of 26 (permalink) Old 06-20-2018, 12:48 PM
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Mike--94MSP9C1 has pointed out to me that I was not clear enough when I said:


Quote:
I know little about the AC system
POST#4



Again I am no expert.


It is a misconception that the "Great White North" is always cold. Today it will be 88F. It can get hotter.



My PERSONAL experience is that removing the air dam seemed to push the temperature gauge a little higher. I have had similar experiences with other vehicles.

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