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I've got an 2003 Tahoe 5.3 AWD. The front AC doesn't

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Hi, I've got an...
Hi, I've got an 2003 Tahoe 5.3 AWD. The front AC doesn't come on unless the temperature is at least 66F but not always. So far I've replaced the compressor, both sensors body control module and control unit. Always the same problem. Had a workshop hook it up to a tech2 and then it is possible to manually activate the ac and it works fine until you turn off the car.
JA: Good to know. The mechanics have tons of experience dealing with this sort of thing. How old is your transmission?
Customer: since 2003
JA: Ok. We'll get you to one of the go-to transmission guys. Other than the problems you mentioned, how has the car been running?
Customer: fine
JA: Noted. I'll pass this info along to the mechanic so that he can get you a quick fix. Anything else I can tell the Chevy Mechanic before I connect you two?
Customer: Similar problem with the rear ac, I can control the fan speed but nothing else.
JA: Got it. Let's get this figured out. I'm sending you to a secure page on JustAnswer so you can place the $5 fully refundable deposit now. While you're filling out that form, I'll tell the Chevy Mechanic about your situation and connect you two. You'll be on the road in no time.
Submitted: 1 year ago.Category: UK Car
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Answered in 5 hours by:
4/14/2016
UK Auto Mechanic: Ryan Schott,
 replied 1 year ago
Ryan Schott
Category: UK Car
Satisfied Customers: 83
Experience: technician at Demarois Buick Gmc
Verified
So the compressor clutch does not engage or it just doesn't blow cold?
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Customer reply replied 1 year ago
It doesn't engage. Already had the system charged and recharged twice.
UK Auto Mechanic: Ryan Schott,
 replied 1 year ago
which sensors did you replace?
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UK Auto Mechanic: Ryan Schott,
 replied 1 year ago
here is the schematic, i assume you replaced the pressure and low pressure sensors, or did you put temp sensors in the dash? If it was commanded on with a tech 2 we know the circuit is intact from the pcm to relay to clutch so our issue is on the other side, if the low pressure switch is new we should test its ground first, do you have a test light or a multi meter?
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Customer reply replied 1 year ago
I've replaced both pressure sensors. I have a multimeter and tech 2 to my disposal.
UK Auto Mechanic: Ryan Schott,
 replied 1 year ago
disconnect the low pressure sensor, the one on the accumulator on the pass side of engine compt, and ohm the black wire to ground.
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Customer reply replied 1 year ago
I'm getting 0.10-0.15 at the 20k ohm setting
UK Auto Mechanic: Ryan Schott,
 replied 1 year ago
way too much resistance, run a ground jumper from that to the negative battery and see if your ac works.
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UK Auto Mechanic: Ryan Schott,
 replied 1 year ago
plug it in and backprobe in a jumper that is.
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Customer reply replied 1 year ago
No nothing happens
Customer reply replied 1 year ago
Same results
Customer reply replied 1 year ago
Tried back probing while connected with the multi meter and got 0.65 if that helps
Customer reply replied 1 year ago
But with the negative jumper connected to it it reads -0.90
UK Auto Mechanic: Ryan Schott,
 replied 1 year ago
what does it read disconnected key off in the 200 ohm range
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Customer reply replied 1 year ago
2.5
UK Auto Mechanic: Ryan Schott,
 replied 1 year ago
okay that's way better .15 in 20k range is a lot more. next we need to ohm from the dark blue wire to the hvac control module, one sec and ill get a connector view for you
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Customer reply replied 1 year ago
It reads -3.2
Customer reply replied 1 year ago
Sorry, 1.0 when key of and all electrics off.
UK Auto Mechanic: Ryan Schott,
 replied 1 year ago
plug back in and go in with your tech 2 and read pcm data, data2, look at ac request signal and see if it switches when you command it on or off.
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Customer reply replied 1 year ago
When I go into body->HVAC->data display->input/output the A/C switch says off, on when pressed.
A/C permission withheld
Outside temp.raw 55F
Outside temp filte 25F
Pressure cycle switch normalA/C clutch won't engage unless I turn ax permission from withheld to granted.
Hope this helps.
UK Auto Mechanic: Ryan Schott,
 replied 1 year ago
in the PCM data list what does the high side pressure read?
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Customer reply replied 1 year ago
74psi
Customer reply replied 1 year ago
And a/c request signal says no even when I press the snowflake button in dash
UK Auto Mechanic: Ryan Schott,
 replied 1 year ago
what does the pcm ambient air temp read.
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Customer reply replied 1 year ago
IAT 80F
Customer reply replied 1 year ago
That's not what you are looking for, trying to find where they show ambient temp
Customer reply replied 1 year ago
But I did find A/C request and commanded it on and it works fine
Customer reply replied 1 year ago
Ok can't find ambient temp, only iat now 91F outside raw 59F and outside filter 25F. But my mirror says 50F
UK Auto Mechanic: Ryan Schott,
 replied 1 year ago
just a minute I haven't hooked up to an 03 in a while let me look. I can't spot it ,but the temp in your mirror should be it. All signs point to a hvac controller but you already replaced it so I'll have you try some odd things now. unplug that low pressure switch again and jump the dark blue wire straight to the negative battery post while its unplugged and try it, if not then remove the ambient temp sensor and cycle the ignition to see if it drops out or maxes out, then jump it and see if it changes, may need to cycle ignition. the temp sensor can be accessed below the turn signal.
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Customer reply replied 1 year ago
Ok, no change when jumping the dark blue wire. Unplugged temp switch and temp in mirror maxed @99 and shortly went to 97. Still no A/C but idle is a little rougher
Customer reply replied 1 year ago
Jumped the temperature switch and no change in temp or ac
UK Auto Mechanic: Ryan Schott,
 replied 1 year ago
I'm going to reopen the question because i don't want to tell you to replace parts that you already did but i'm going to keep looking and see if i am missing something. Wait to respond so all experts can review your question.
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Ryan Schott
Ryan Schott
Ryan Schott
Category: UK Car
Satisfied Customers: 83
83 Satisfied Customers
Experience: technician at Demarois Buick Gmc

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