A/C pressure readings on my 2000 Escalade

[Stresst]

My guages finally arrived so I figured let me see whats going on with my 2000 Escalade. One thing I noticed on the highway this morning my center vent temps fluctuate big times anywhere from 38-45 degrees. Doesnt matter speed thou it seems to blow cooler when im going under 40mph. In the past few weeks it would stay around 38-40 no matter the speed on the highway until I either hit traffic or got off the highway.

Started the truck, outside temp is 83 degrees with 70% humidity.

5 minutes at idle:
low 50, high 210 with 66.5 center vent temp.

10 minutes idle
low 50, high 230 with 63 center vent temp.

5 minutes @ 1500RPM
low 40, high 360 with 58 center vent temp.

7 minutes @ 1500RPM
low 33, high 265 with 53.5 center vent temp.

10 minutes @ 1500RPM
low 32, high 260 with 52.8 center vent temp.

12 minutes @ 1500RPM
low 35, high 320 with 54.5 center vent temp

So what the heck is wrong??

 

[SunlitComet]

Have you ever noticed swelling or liquid permeation of the rubber hoses. It almost like the total space volume inside system or displacement of compressor is changing.

Would you mine pm me your vin there is some rpo codes on your vehicle codes I want to check out. Are if you prefer to list them here without the vin.

 

[Stresst]

Have you ever noticed swelling or liquid permeation of the rubber hoses. It almost like the total space volume inside system or displacement of compressor is changing.

Would you mine pm me your vin there is some rpo codes on your vehicle codes I want to check out. Are if you prefer to list them here without the vin.

PM sent. No I never noticed anything but then again I was never looking.

 

[SunlitComet]

is the insulator material around the accumulator?

---------- Post added at 02:15 PM ---------- Previous post was at 02:14 PM ----------

nice option package by the way.

 

[Stresst]

is the insulator material around the accumulator?

Yes its in place.

---------- Post added at 02:15 PM ---------- Previous post was at 02:14 PM ----------

nice option package by the way.

The only option I want is a/c! lol

 

[SunlitComet]

I am starting to get stumped. I know it is along shot but would you be interested in measuring diameters of rubber hoses that have not been replaced to see if they swell a lot from a cold engine vehicle to a hot running vehicle?

 

[Stresst]

I am starting to get stumped. I know it is along shot but would you be interested in measuring diameters of rubber hoses that have not been replaced to see if they swell a lot from a cold engine vehicle to a hot running vehicle?

Dude, I will do ANYTHING to help solve this problem. Im wondering if its the rubber hoses I bought that run front to rear??? I have to get a caliper to measure them accurately. ( I work at a machine shop but were closed for 1 more week.) I really dont want to buy one unless I can find one cheap......BTW which hoses are rubber? I know the compressor hose but what else?

 

[gpracer1]

My guages finally arrived so I figured let me see whats going on with my 2000 Escalade. One thing I noticed on the highway this morning my center vent temps fluctuate big times anywhere from 38-45 degrees. Doesnt matter speed thou it seems to blow cooler when im going under 40mph. In the past few weeks it would stay around 38-40 no matter the speed on the highway until I either hit traffic or got off the highway.

Started the truck, outside temp is 83 degrees with 70% humidity.

5 minutes at idle:
low 50, high 210 with 66.5 center vent temp.

10 minutes idle
low 50, high 230 with 63 center vent temp.

5 minutes @ 1500RPM
low 40, high 360 with 58 center vent temp.

7 minutes @ 1500RPM
low 33, high 265 with 53.5 center vent temp.

10 minutes @ 1500RPM
low 32, high 260 with 52.8 center vent temp.

12 minutes @ 1500RPM
low 35, high 320 with 54.5 center vent temp

So what the heck is wrong??

Can I assume that the air is on high and the windows are rolled up and on recirculate/max ?

Also is it just front air on, or both?

The pressures look close , your humidity levels are killing some of your cooling capacity since it takes energy to condense water. Your cold air will not be as cold as mine especially at idle because we have only 9-25% humidity, usually around 12%.

I would like to see what happens when you test it again but with the biggest fan you can find right in front of the condenser. Maybe even spray with a spray bottle every 5-10 seconds and watch the high side drop like a rock. The pressures almost seem like a slight lack of airflow at the condenser.

Cutting off at about 38F is normal cycle switch to prevent the evaporator from freezing the condensation to ice.

Here are my temps to compare but at 96 degrees ambient. Notice my high side is much lower even though it is way hotter out. The fact that it works on the freeway means lack of airflow.

Low speed blower stock cooling:
34F......23 psi low.....235 psi high
Low speed blower with evap cooler:
33F.....24 psi low.....190 psi high


High speed blower stock cooling:
42F.....33 psi low....260 psi high
High speed blower with evap cooler:
38F.....28 psi low....205 psi high
4 degree vent difference just at idle with better airflow!


Front and rear AC on toghether measured at front vents:

Low speed blower stock cooling:
40F.....31 psi low.....245 psi high
Low speed blower with evap cooler:
35F.....23 psi low.....175 psi high (cut out at 22psi with evap @1800 rpm)


High speed blower stock cooling:
52F....46 psi low....280 psi high
High speed blower with evap cooler:
44F....34 psi low....195 psi high
8 degree vent difference with better cooling at idle !!!!!!!!!

Evap cooler was about 75F in front of radiator.

Freeway test at 70 mph @ 2000 rpms 3.73 gears:
Truck internal ambient at blower motor 59F
Outside 95 F.
Front only on high cycled continually at 39.6F
Front and rear on high cycled continually at 36.4F

 

[Stresst]

Can I assume that the air is on high and the windows are rolled up and on recirculate/max ?

Also is it just front air on, or both?

The pressures look close , your humidity levels are killing some of your cooling capacity since it takes energy to condense water. Your cold air will not be as cold as mine especially at idle because we have only 9-25% humidity, usually around 12%.

I would like to see what happens when you test it again but with the biggest fan you can find right in front of the condenser. Maybe even spray with a spray bottle every 5-10 seconds and watch the high side drop like a rock. The pressures almost seem like a slight lack of airflow at the condenser.

Cutting off at about 38F is normal cycle switch to prevent the evaporator from freezing the condensation to ice.

Here are my temps to compare but at 96 degrees ambient. Notice my high side is much lower even though it is way hotter out. The fact that it works on the freeway means lack of airflow.

Low speed blower stock cooling:
34F......23 psi low.....235 psi high
Low speed blower with evap cooler:
33F.....24 psi low.....190 psi high


High speed blower stock cooling:
42F.....33 psi low....260 psi high
High speed blower with evap cooler:
38F.....28 psi low....205 psi high
4 degree vent difference just at idle with better airflow!


Front and rear AC on toghether measured at front vents:

Low speed blower stock cooling:
40F.....31 psi low.....245 psi high
Low speed blower with evap cooler:
35F.....23 psi low.....175 psi high (cut out at 22psi with evap @1800 rpm)


High speed blower stock cooling:
52F....46 psi low....280 psi high
High speed blower with evap cooler:
44F....34 psi low....195 psi high
8 degree vent difference with better cooling at idle !!!!!!!!!

Evap cooler was about 75F in front of radiator.

Freeway test at 70 mph @ 2000 rpms 3.73 gears:
Truck internal ambient at blower motor 59F
Outside 95 F.
Front only on high cycled continually at 39.6F
Front and rear on high cycled continually at 36.4F

Fan was on high, ricirc on, windows all up except drivers door was open about 6". Front and rear both on.

As far as a fan goes, I forgot to mention I have a 9" on the right side of the condenser to keep the 14" on the left side company!

 

[SunlitComet]

use a waist measuring tape if you got one. Anyone that is not aluminum or steel. LOL. I think the rear under vehicle might have some flex hose on it. You will have to check.