8 hours ago, kmealy said:

Celebrated my birthday by doing set construction. 

 

Well, Happy Birthday Keith!  Sounds like it was a pretty good day

Did our birthday fairy miss Keith's birthday (maybe I missed the post). Regardless (or irregardless, whichever you prefer), Happy Birthday Keith!

Must've missed it too. Anyhow (or anyways) , hope it was a good one, Keith.

11 hours ago, Grandpadave52 said:

Finally got back to messing with it. Low side shows about normal operation, high side normal for ambient temp, clutch cycles on/off ~ 7 seconds intervals. I can hear and feel low pressure switch cycling in/out. Low side lines never get cool let alone cold at or beyond the accumulator. If it was an old R-12 system with an expansion valve, I'd guess it bad??

 

 

Few of things to look into.  1.  Did you change AC compressor relay? #44 in fuse box under hood.  Contacts can be bad in relay causing same problem.  2.  To test you can bypass relay and directly apply power to system.  Does this eliminate cycling?  3. Fan clutch is electronic, connector is on driver's side of fan shroud.  It is common for connector or wires to be damaged.  

 

You either have manual HVAC or Automatic HVAC.  A manual system is directly controlled by ECM, an Automatic HVAC has an additional HVAC Control Module that also gets a say in the matter.  If you want wire schematics, I can send them just need to know which system.

 

That is for possible electrical issue.  The system could have a restriction, just about anywhere.  Including orifice tube in backwards or plugged condensor and or lines.  

11 hours ago, Grandpadave52 said:

If it was an old R-12 system with an expansion valve, I'd guess it bad??

 

 

That's about all you've got left Dave. BTW, R-134 systems do have one. 

 

, I'm sure you know who's site this is. 

2 hours ago, Gene Howe said:

Must've missed it too. Anyhow (or anyways) , hope it was a good one, Keith.

We often have quizzes or riddles for the teenagers that show up to help.  Yesterday's was, my age is a twin prime.  How old am I? Two good choices.

I would actually place you in the middle of the 2 choices (no offense if you're the younger age). But here's a guess; some time back you mentioned in a post that you were married 43 years....so if you married at 20 that would make you 63 knocking out the 59, 61 pair. That leaves the 71, 73 pair and I'll guess 71. I know you're not younger since sometime back you were applying for SS (that also knocks out the 59, 61 pair)

 

 

PS, I should add: yes, I had to look the prime number stuff up.

Edited August 21, 20223 yr by Fred W. Hargis Jr

Prime numbers are easy. Just apply the Fibonacci ratio and divide by pi.

11 hours ago, Gunny said:

 

 

Few of things to look into.  1.  Did you change AC compressor relay? #44 in fuse box under hood.  Contacts can be bad in relay causing same problem.  2.  To test you can bypass relay and directly apply power to system.  Does this eliminate cycling? I swapped the relay with a known good one still cycles; initially by-passed when I was troubleshooting the old clutch non-engagement  3. Fan clutch is electronic, connector is on driver's side of fan shroud.  It is common for connector or wires to be damaged. New fan clutch; 

 

You either have manual HVAC or Automatic HVAC.  A manual system is directly controlled by ECM, an Automatic HVAC has an additional HVAC Control Module that also gets a say in the matter.  its automatic, dual controlsIf you want wire schematics, I can send them just need to know which system.

 

That is for possible electrical issue.  The system could have a restriction, just about anywhere.  Including orifice tube in backwards I pondered that but 98.2% sure I installed it correctly...the old one was dirty/ stained but not plugged nor any metal contaminates or plugged condensor and or lines.  hindsight is 20/20 but should have at least tried to blow air through it or perhaps flushed but with no physical evidence of contamination, I didn't...I'm hoping I removed all plastic plugs I put in where ever I broke a line

Thanks for the help Gunny. I hate to admit defeat on this one, but think I just need to step away. I've got too many other projects that need attention and the kid just wants her car back.

 

Good news is, everything else I did seems fine. Runs/idles much better after cleaning throttle body, new plugs, air filter, cleaning MAF sensor, replace camshaft position sensor (it was leaking oil from connector body). It had a new water pump, drive belt & alternator on it; I replaced tension idler assembly, other idler, radiator (20+ years old; seeped at top tank when cold), thermostat, new hoses, antifreeze, radiator cap, fan clutch cooling fan & shroud ( most of that SHOULD have been replaced when water pump failed but it wasn't). It occasionally was throwing a P1484 code which indicated a cooling fan issue. That's what started me on the journey. The more I removed, the more I found.

 

Needs a new fuel filter yet but has to be a lift to remove that stupid poly skid panel underneath. I'll have the shop do that too.

11 hours ago, Larry Buskirk said:

 

That's about all you've got left Dave. BTW, R-134 systems do have one. 

 

, I'm sure you know who's site this is. 

Yeah I saw that too Larry. After some digging around and research those are only used on models with actual independent rear AC which have separate evaporator unit. Hers has rear controls, but not rear A/C. Plenty cornfusing..

 

And yes, know the site all too well. Got lots of those free "classic car" magnets. In fact will be ordering parts for my truck this coming week.

11 hours ago, Gene Howe said:

Fibonacci

I'd sometimes write, "What the Fibonacci !@#$%" as a polite nudge, when someone types a single terse reply, "WTF".  Of course, that is not necessary here. I'm surrounded by all of you angels. 

 

As my brother famously replied when my GF exclaimed, meeting the family for the first time, "You're all so nice to each other", "Wait 'till you get to know us". 

18 hours ago, kmealy said:

We often have quizzes or riddles for the teenagers that show up to help.  Yesterday's was, my age is a twin prime.  How old am I? Two good choices.

 

18 hours ago, Fred W. Hargis Jr said:

PS, I should add: yes, I had to look the prime number stuff up.

 

Given what Fred has said and also looking up this stuff, I will go with the 73.  I "think" you are a bit older than I am

8 hours ago, Grandpadave52 said:

Yeah I saw that too Larry. After some digging around and research those are only used on models with actual independent rear AC which have separate evaporator unit. Hers has rear controls, but not rear A/C. Plenty cornfusing..

 

And yes, know the site all too well. Got lots of those free "classic car" magnets. In fact will be ordering parts for my truck this coming week.

 

Talked with a certified Auto AC Tech I know and he said three possibilities with the Climate Control Module being the most likely.

He said it's not uncommon to find donuted solder connections where the plug contacts connect inside the control module.

Here's the list of parts he said to check.

Climate Control Module

Cabin Air Temperature Sensor

Climate Control Sun Sensor

 

Come to think about it the Climate Control Module on my brothers 2000 Blazer was why his A/C wouldn't work.

He had taken it to a Mida's shop, and they couldn't figure it out. It was also cycling.

Someone told him that they had to have their control module replaced at the dealer after taking it somewhere else.

 

He got lucky and got a good one at the boneyard.

2 hours ago, Larry Buskirk said:

Here's the list of parts he said to check.

Climate Control Module

Cabin Air Temperature Sensor

Climate Control Sun Sensor

I'm leaning toward this but have no good way to diagnose. My scanner is not high end. Good news is salvage yard about 6 miles away has 15-20 '02-08 TB's, Bravada's, Envoys most with dual climate controls. Already talked to them. Need a Front, passenger side door panel. Someone (not me) apparently had tried to remove before without taking out hidden from view 6mm screw. Breaks the door handle off every time.

 

I looked all over but don't think this has actual Cabin Air Temperature sensor. Seems like a common failure also on Silverados, Yukon, etc.

 

Thanks Larry

@Grandpadave52

I forgot to mention that he has had success resoldering the pin connections on the circuit board. Said it works better than half the time.