I don't think there is an issue with the fan clutch as its under a year old, brand new at the time GM item. No crap in the radiator (I'll check between the condensor and the radiator to make sure).
First time I've heard about a manual A/C system having an automated feature. Mine has the manual a/c controls...not the automatic ones, where you just set the temp and the system maintains that.
I'll check to make sure no blockage at condensor. Truck has always run under 210F and the A/C is probally one of the best I've seen. It works very well and will freeze your @$$.
I may not have an issue. Its not a big deal to me..I was just wondering why the fan speed seemed to increase by itself as if in re-circulate mode, but with manual controls re-circulate mode had not been enabled.
Thanks for the feedback
Quote:
Originally Posted by brcidd
There is nothing wrong with your system- it automatically goes into recirc mode when head pressure hits 350 psi--this makes it sound louder wshen there is less air flow restrictions-- system is performing as designed. We call this "poor man's climate control"
Per the service manual-- recirc door shut when system pressure returns to 250 psi or below- ther is a timer involved as well, see if when you slow down, (head pressure rises) that recirc door opens- then closes after a given amount of time after driving at highway speeds-- You may also have a fan clutch problem- or air flow across condenser problem-- dirty condenser would definitely cause this.
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