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AMBIENT TEMP VS CABIN TEMP

FJRIVAS24 on Sun June 13, 2010 5:52 PM User is offlineView users profile

Year: 2006
Make: VW
Model: JETTA
Engine Size: 2.0T
Refrigerant Type: R134
Country of Origin: Dominican Republic

Hi guys,

I am at the point where I don't know if the A/C system in my car is under performing or I am just being too picky / perfectionist ... I know but it happens from time to time. Let me ask you this:

As a general rule of thumb (I know this is not written in stone) what is a reasonable delta temperature to expect out of a car's A/C system? When I say delta temp I mean outside temp vs cabin temp. I live in a hot place (Dominican Republic) and lately the ambient temp is consistently hitting 95 F and when I measure the air temp coming out of the center vents it is 50 F ... So, delta is 45 F.

By the way I get this delta with fan speed about 60% ... It's a 7 speed fan and I usually run it at speed #4, I've found this to be the best balance so far between temp and air flow.

Is this delta temp fine or am I just being toooo picky?? I have not measured the performance of my cousin's 2003 Corolla but it really feels like a stronger system, specially when he runs the A/C at full blower speed.

Again, I am just trying to draw a line and determine what's reasonable to expect let's say at 85, 90, 95 and 100 F outside temperature.

Thanks guys !!

Francisco

fonebone on Sun June 13, 2010 9:41 PM User is offline

Hi Francisco-Unless you put gages on the car and do a performance test it would be difficult to determine if your Jetta is operating a max efficiency. Proper way of course is to remove the charge, evacuate the system, and put the precise charge back in as called for, should be under the hood, and check temps again. If you have had the car long enough to tell if it's cooling less than it used to, there my be cause for concern, otherwise forget it. You will notice a difference in other makes of cars--yes, some are definitely better than others! Under those ambient temps you listed for your area, I would say you are doing just fine, for that car make.

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