03 owners with low A/C output at idle

[Matt400]

There is a simple way to determine if your 03 needs the TSB 18-043-03 done.



Start your truck and turn on the A/C full speed at idle in park.

Now walk around to the front and listen for the Vistronic Fan to start pulling more air through the grill.

If you hear your A/C compressor cycling off and no fan roar then you need the TSB done. Inside vent temperatures will not be cold.



What happens is temperatures rise so high in the A/C the compressor cuts out for protection. With the TSB the fan will kick in pulling air through the condenser keeping pressures down so the compressor will continue to move refrigerant.

 

[DaveHess]

What does TSB 18-043-03 entail? I've been avoiding any dealer contact due to that garbage they'll probably add for the reverse gear stuff.

 

[jfluffy2]

I just got my 05 QC with 170,000 and is what my ac is doing I live in Florida and if the temp gets over 90 the A/C compressor start cycling. I will be checking into TSB 18-043-03

Thanks for the info