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TheApocalyptican on Thu July 23, 2009 2:32 AM User is offline

Year: 1989
Make: Chevrolet
Model: S10 Blazer
Engine Size: 4.3
Refrigerant Type: r12
Country of Origin: United States

My Blazer has had working a/c since I bought it last summer. However, during the 100+ days here in Vegas it struggles to keep up. I took it to an a/c place here in town today, and it isn't low on refrigerant. As far as they are concerned it should be working well. To me....it doesnt work well enough. I'd like to think I could get cooling equal to my dads Express which is ice cold. I have an aux fan in front of the condenser, the fins are near perfect shape and the blower motor works as it should. What would the pros here suggest I do for better cooling. I know I could get a PF condenser, but how much would that help? Also, is there any sort of compressor upgrade that can be done fairly easily? I am fairly mechanically inclined, so I'd do the work myself, all except for the evac and recharge.

Chick on Thu July 23, 2009 7:01 AM User is offlineView users profile

Would help if you posted both high and low side pressures, and the ambient temp taken at.. .. Does it cool better at night or on cloudy days? Do you have a headliner inside? cools better on the highway? Feel the inlet and outlet of the evap (after the O tube) it's it just slightly colder coming out of the evaporator? If not, you might be low on refrigerant, only way to tell is to have it weighed.. Pressures alone won't tell you it's full...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

GM Tech on Thu July 23, 2009 8:22 AM User is offline

Those old box style blazers were the worst cooling vehicles ever made-- "in the day" people in the back seat wanted out-- NOW..could not survive the heat-- had numerous complaints about them. They have evaporators and condensers that are too small--period-- so to try to better that system - good luck--I'd switch to another vehicle first......less money in the long run...Just letting you know what I went through back in the 90's.....

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

fonebone on Thu July 23, 2009 1:22 PM User is offline

Hey GMTech; I remember battling with a couple of those blazers for friends and gave up when I found out that, besides the lousy engineering, that the cabin intake air for A/C was located low in the cowl right in the path of the 200 degree heat coming out of the engine bay. Can you verify? Thanks

GM Tech on Thu July 23, 2009 1:47 PM User is offline

Recirc never helped much- so no I can't verify that-- as long as the hood insulator seal is present- it should not be a problem

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

JLHAWKINS on Thu July 23, 2009 2:42 PM User is offline

I have one of these vehicles that in other aspects I really like but must agree with everyone on the HVAC. Not only the cooling portion, but the heating system is nothing to boast about.

My thoughts are that the system components were designed for the original S-10 two door short cab pickup. In that configeration system perfomance was probably adequate. When you look at the Blazer body style with its larger interior volume and added glass area, all components become undersized.

That aside, the first generation S-10 Blazers were and are good vehicles.

TheApocalyptican on Thu July 23, 2009 2:58 PM User is offline

Chick: I don't have any gauges to test the pressures with. Seeing as all my vehicles have r12 in them, I haven't ever bought anything to measure, since I'd have to take it somewhere to be charged. As far as the inlet/outlet...that is one of the things that the a/c place I took it to checked, and I also did again last night, and it is colder. At night it works really well. Cloudy it usually works better too. If I lived in say So. Cal, where it rarely was 100 outside I probably wouldnt be posting, as during time where it is like 95 and below, it works well enough that I'm fine with it.

GM Tech....the condenser to me seems to be close to the size of the ones I see on many other vehicles. The evap tho, does seem small. So a better flowing condenser probably won't help due to the size of the evap will it?

Should I look at cutting off the rear section of the cab? I very rarely have anyone in the back seat anymore, so it's something I can do.

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