1978 911 SC Targa with 170K miles. This is my daily driver including 80 mile round trip commute each day. I love this car and can't wait to drive it each day.
In anticipation of the summer heat, in March I had my local shop replace the compressor, receiver/dryer, expansion valve, and converted to R-134a. All replacement parts were OEM equivalent (no upgrades).
As the heat of the summer came to pass, it was clear that the stock a/c system wasn't keeping me cool enough on hot days (over 95F). I researched and read almost every post that I could find about 911 a/c systems and how to improve them.
My first step was to install the Griffiths/Kuehl Tri-Vent system. This routed a lot more air from under the dash and to the side vents, but still didn't solve the problem.
After looking at all of the upgrade options, I decided to go with the following;
1. Griffiths front condenser
2. Griffiths front condenser blower motor
3. Griffiths serpentine evaporator
3. Griffiths wirbelsturm evaporator blower motor
My local shop did the install and recharged the system. They said that they had a couple of questions during the install and contacted Griffiths and that Griffiths was great to work with.
The past few weeks have been in the 80's so it was hard to know what the system would really do.
This weekend, a big heat wave hit SoCal and it was 104F as I was traversing the San Fernando Valley via the 118 Frwy on my drive home today. At a steady 75mph, I measured the vent temps at 56F. Let me say that again; vent temps at 56F in 104F outside temp!
That 56F air felt like an arctic blast! Ahhhh. Not a bead of sweat in sight.
And the volume of air that the wirbelsturm evaporator blower motor put out is truly impressive - that thing BLOWS big time!
I was cool and comfortable all the way home and I couldn't be happier.
