persistent a/c issues

persistent a/c issues

Postby tstol [OP] » May 24th 2021, 2:06pm

Good morning,

I have a 2003 GMC Safari. Last year the a/c stopped working. Brought it to my mechanic who replaced the blower and transistor. Ever since then the transistor keeps blowing. I have had it replaced several times now.

It finally warmed up this spring in upstate NY. Since last week was the first time I used my a/c, I realized it wasn't working well and brought it to the shop. They diagnosed and replaced the transistor again. It is still not running strong! We are all frustrated.

Any thoughts from the Master's?

TStol
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Re: persistent a/c issues

Postby CopperFiremistCopperFiremist is online! » May 24th 2021, 5:15pm

When you say running strong do you mean the volume of air coming out the vents or the temperature.
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Re: persistent a/c issues

Postby Mmusicman » May 24th 2021, 6:33pm

Transistor?
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Re: persistent a/c issues

Postby Leeann_93 » May 25th 2021, 12:51am

I’m assuming they mean resistor.

When they replaced the blower motor and resistor, what brand parts did they install? Second, did they check the electrical harness? They tend to arc and burn inside the connector and will take out any replacement resistor that’s installed.

It looks like this when it’s toast:
Image

Get a replacement AC Delco harness and a replacement AC Delco blower resistor and have the shop replace both.
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Re: persistent a/c issues

Postby Mmusicman » May 25th 2021, 1:00am

Doing "half a job" usually means it's coming back
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Re: persistent a/c issues

Postby tstol [OP] » May 25th 2021, 8:56pm

CopperFiremist wrote:When you say running strong do you mean the volume of air coming out the vents or the temperature.


Both volume of air and temperature. Thanks for having me clarify.
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Re: persistent a/c issues

Postby tstol [OP] » May 25th 2021, 8:58pm

Mmusicman wrote:Transistor?


I swear that's what my mechanic called it. Maybe I mis-heard? I'll call and ask. Back to you tomorrow.
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Re: persistent a/c issues

Postby tstol [OP] » May 25th 2021, 8:59pm

Leeann_93 wrote:I’m assuming they mean resistor.

When they replaced the blower motor and resistor, what brand parts did they install? Second, did they check the electrical harness? They tend to arc and burn inside the connector and will take out any replacement resistor that’s installed.

It looks like this when it’s toast:
Image

Get a replacement AC Delco harness and a replacement AC Delco blower resistor and have the shop replace both.


I will find out and get back to you tomorrow with specifics. Thank you.
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Re: persistent a/c issues

Postby tstol [OP] » May 25th 2021, 10:16pm

Mmusicman wrote:Transistor?


Resister. Sorry...too many years in the military. Heard him wrong.
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Re: persistent a/c issues

Postby tstol [OP] » May 25th 2021, 10:18pm

tstol wrote:
Leeann_93 wrote:I’m assuming they mean resistor.

When they replaced the blower motor and resistor, what brand parts did they install? Second, did they check the electrical harness? They tend to arc and burn inside the connector and will take out any replacement resistor that’s installed.

Get a replacement AC Delco harness and a replacement AC Delco blower resistor and have the shop replace both.


I will find out and get back to you tomorrow with specifics. Thank you.


1) AC Delco
2) Harness good

Think I should have them replace the harness as well?
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Re: persistent a/c issues

Postby Leeann_93 » May 26th 2021, 1:07am

If the harness is good, no arcing or burning, then no.

But now they need to look at the vacuum to the controls and the controls themselves - they do go bad on occasion.
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Re: persistent a/c issues

Postby tstol [OP] » May 26th 2021, 2:03pm

Leeann_93 wrote:If the harness is good, no arcing or burning, then no.

But now they need to look at the vacuum to the controls and the controls themselves - they do go bad on occasion.


Thank you. I had the vacuum lines replaced last year, so we're down to the controls. First question: are there controls you recommend. I don't want to go through the whole process only to find out I bought controls that fail often. Second question: if the ac was great, then the vacuum hose went, then the blower went which resulted in a new blower and resister (and fantastic ac), do you think it's actually likely that it's the controls? The ac is cool, not cold. It is weak coming from the vents, but still working at each fan level. It's exactly as it was last year when I brought it in for the new resistor. Every time I got a new resistor, it blew cold, then stopped.

I'm only asking this before I delve into a project that takes me down a rabbit whole.

Thank you for your time and patience.

Tad
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Re: persistent a/c issues

Postby Leeann_93 » May 26th 2021, 10:09pm

Okay, wait. You had ice-cold AC with good airflow. Now you have good airflow, but ehhhh AC? Or do you have bad airflow AND ehhhh AC?

If good airflow but the temp isn't cold enough, you have a refrigerant leak somewhere in your system that needs to be found and fixed, then the system recharged.

The resistor simply controls the blower motor, stepping it down from full speed. It has nothing whatsoever to do with the temperature. Nor does the blower motor; it simply moves the air at the speed you've selected.

You have a blend door actuator, which has 5 plastic gears and a small electric motor inside to either open or close a flap to allow engine heat into the air ducts or block it from the ducts (under the doghouse, on the side of the heater core housing where the passenger feet go). The plastic gears can crack and jam the works.

There's a vacuum unit under the passenger-side dash; sometimes those hoses get kicked off, often they just dry-rot and fall apart, but they're out of sight and out of mind. Then, of course, the controls themselves have vacuum plugged into the back of them. Those hoses also can get crunchy, loose, cracked, etc.

Then there are the vacuum hoses and check valve in the engine compartment.

GM779617 - Astro Vacuum.png


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Re: persistent a/c issues

Postby tstol [OP] » May 29th 2021, 2:17am

Great information. Thank you so much. To answer your question, now I have bad airflow AND ehhh ac.
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