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Discussion Starter · #1 ·
Traveling to Myrtle Beach, Air blew cold for eight hours and then start to get hot. I would blow cold and then get hot for a while, now it is just hot air. I have checked the compressor and it is running. What do you think, low on refrigerant? Does anyone know which fit it is to add Refrigerant?

Thanks
Ron
 

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it probably just needs a recharge your local jiffy lube or *oil change* place will do that over here its only 49.99 but i never use my a/c thats why they invented windows =) not sure where your from but like a valvoline does it midas those places.
 

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Discussion Starter · #3 ·
I'm in Myrtle right now. Its 91 and the wife and kids are not happy about no air therefore I'm not happy. I figure it just needs a recharge also. I ran to the local Walmart but I just not sure of which fit to do the recharge.

Thanks
 

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O your do the recharge yourself?? your better off going somewhere itll take them like 20 minutes. and they can verify that, that is the problem. im no mechanic so im not sure. becasuse if thats not the problem you just wasted money.
 

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i no my ac wasnt working because of a relay but thats also a bit newer than 91. and the dealership diagnosed that not me. so i doubt its that. actually if there is an "aamco" they will check it out for free. other places charge money to look at it. i no aamco is mainly tranny's but they do everything. get the answer from them and then decide if you want to still do it yourself.
 

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Traveling to Myrtle Beach, Air blew cold for eight hours and then start to get hot. I would blow cold and then get hot for a while, now it is just hot air. I have checked the compressor and it is running. What do you think, low on refrigerant? Does anyone know which fit it is to add Refrigerant?

Thanks
Ron
It is really hard to see if the compressor is running. You will see the pully spinning but inside of that is the compressor clutch, and that is what turns and spins the compressor. Is the accumalator/reciever dryer cold? (silver thing, about the size of a large fruit juice can, pass. side by firewall)
 

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One reason AC systems generally need a professional is exactly for the kind of question: which is the right fitting for a recharge? You stick a can and hose on the high pressure side accidentally and you end up with a grenade. Knowing how the system works and tracing the hoses is usually the way to find the low pressure port. But I resist just telling people what port that is because it's not a DIY project for most folks who need to ask the question in the first place.

Also, there's no rational reason to slap a can of R134 into a system that you don't KNOW needs it by checking the gauges. You can easily overcharge your system, and that has bad side effects. Recharging a leaky system does nothing to solve the root cause - the leak. It's like treating a fever or a chill without using a thermometer on the patient to see what their real problem is.

Choosing a "free inspection" kind of place with no check of their reputation is dangerous. There's no such thing as a "free" inspection. They either make it up on you when you get the work done, or the next guy if you decline to get it fixed. Choose by reputation and local recommendations. In general, AC specialists are more trustworthy than general repair places, due to training, tools, volume, and their need to live and die by their reputation. It's hard to make a living fleecing tourists only.
 

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Discussion Starter · #9 ·
Update

Minimum charge to just look at it is $125. They just love people on vacation!! I know it has to be charged on the low pressure side but have not been able to locate. The trailblazer also has the rear air so i just wasn't sure where the low pressure connection is at.

Thanks for all the feedback!
 

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have you tried tapping on the little part with a screwdriver?

theres a switch readily seen in the engine bay- that many on here tap and the AC system comes back to life.

Maybe someone on here knows what Im talking about and can show you a pic.
 

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i hope he read my post-- before he goes and pays $$$ to have it fixed...
it will be worse if it turns out to be that switch..
 

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...Also, there's no rational reason to slap a can of R134 into a system that you don't KNOW needs it by checking the gauges. You can easily overcharge your system, and that has bad side effects. Recharging a leaky system does nothing to solve the root cause - the leak. It's like treating a fever or a chill without using a thermometer on the patient to see what their real problem is.
Roadie speaks true wisdom here! If you do have a leak and just put a "fix-it" can of refrigerant in, you run a serious risk of permanently damaging the compressor. As the refrigerant leaks out, so does oil. Without knowing how much oil and refrigerant has leaked out, you have NO way of knowing how much to put back in. The only way to properly charge an A/C system is to charge it from a leak-free vacuum and to charge with the correct weight of refrigerant and oil. Paying a professional will be cheaper in the long run.
 

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Discussion Starter · #16 ·
Thanks for all the responses. It did turn out to be the low pressure sensor. I jumped it with a piece of wire and the air starting working. Replaced the $21 sensor and had no problems sense.

Thanks
:thx
 

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Thanks for all the responses. It did turn out to be the low pressure sensor. I jumped it with a piece of wire and the air starting working. Replaced the $21 sensor and had no problems sense.

Thanks
:thx
Which wire do you speak of that you jumped? I havent had AC since i've had this envoy.
 

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Which wire do you speak of that you jumped? I havent had AC since i've had this envoy.
The low pressure switch is at the drier at the right side firewall. Also there is a switch I see on my 06 Trailblazer near the compressor. I have had to replace mine on the drier once. I have used a paper clip to jump the terminals on the plug-in on my 96 Blazer to engage the compressor. I don't see why it would not work on the Trailblazer the same way. If you are unsure don't try it. Also, if you do jump it , don't let the paper clip or wire touch any metal surface. Again as I said if you are unsure don't try it.
 
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