Hi

Does anyone know where the sensor is located on a Nissan Primera 2.0 SE (UK
Version) that controls the temp of the AC. I believe it may be mounted near
the evaporator unit, but as I havent even looked yet I dont know where that
is either!!. What I would like to do is alter the sensor to get a much
colder running AC unit. Something similar to this
http://www.fordscorpio.co.uk/acmod.htm
Any replies appreciated

Electro

electro at electrocool dot co dot uk

Are you talking about the thermal switch that cycles the compressor
clutch?

Professor
www.telstar-electronics.com


Electro wrote:

"Professor" <briangriffey (AT) sbcglobal (DOT) net> wrote

Hi Prof
I was talking about that switch, and since posting, have actually ventured
into the AC unit and made a little mod.
I now have, at the flick of a switch, vent temperatures of minus 5 C and can
get the car temperature down to around 8 C. It can run for at least 3/4 hour
without noticing any slow down of the air flow due to ice, but after running
it for that long the car is too cold to drive in anyway. (first test run and
was in a tee shirt absolutely freezing, good job it has heated seats!!) At a
later date I am going to fit the switch to a timer so it cant be left on
continiously, but will revert to the standard switch after XX mins. If
anyone else is interested in this mod, email me at the addredd below, or
reply to this post.

Brian

electro at electrocool dot co dot uk

"Electro" <brian (AT) DELETEcalbri (DOT) co.uk> wrote

Sounds like an amazing feature you have added!
But it does beg the question why?
Are you planning to take the car somewhere /really/ hot?
And how does this affect the fuel economy, have you looked on the car's
computer?
SW

"S W" <dontspam (AT) no-spam (DOT) invalid> wrote

Hi SW

The "boost" is not for long term use, it is purely to rapid cool the car
when you get into it and it boiling hot inside. The fact that the compressor
stays on instead of cycling means the temperature drops a lot lower than it
should, once it is a comfortable temp the the switch is flicked and it is
back to normal operation. As for the MPG I havent noticed a decrease as the
most it was run for was 3/4 hour solid, but suprisingly it seemed to be
getting MORE MPG's, time will tell with further testing.

Brian

Yes, you are correct. I have made a similar mod to my Nissan by adding
a 1K resistor at the sensing module. It keeps the compressor on
constantly. It works like a million bucks and only is an issue when the
blower speed is reduced in humid weather. It really does pick up the
performace of the A/C by eliminating all that hysteresis of the cycling
switch method. I remember in the old days, when they weren't so
cheap... they used to have a suction throttling valve on auto A/C
systems. This valve sensed maintained evaporator pressure and left the
compressor on constantly. This made the A/C work much better than the
new cycling method. The car makers convieniently touted the cycling
method as being gasoline saving... but really is was done for cost
reasons.

Professor
www.telstar-electronics.com