Thread: Aircon pump capacity?

Originally Posted by Judo

How did you hack the thermostat? Replace for an adjustable one, or put a variable resistor (pot or similar?) inline somewhere?

I'm very keen on a variable thermostat for my county air con I'm building... I figure since I'm buying parts I can just buy a generic variable thermostat......? I do have an old aftermarket thing I pulled out I can use for parts as well tho.

The actual thermostat was a NTC (negative temp coefficient) thermistor which is hooked to an amplifier which does the actual switching. I spliced into the thermistor wires and the rotary switch brings in other resistors in series to drop the resistance read by the amplifier and move the cut-in/cut-out point down to a lower temp.

Interestingly none of those parts were shown in the parts schematic for the car or even AC operation diagrams. I had to start pulling the dash apart to find them.

.Words fail me... Certainly explains the lack of ...'coldth' but not the abysmal air flow.
Tube and fin thing looks like an oil cooler...

.

Here is the comparison between the hard-dash and soft-dash in-dash evaporators:

Hard-dash R12 evaporator which is tube and fin:


Soft Dash R134a evaporator whcih is parallel flow flat core type:
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Have a read of this post James: http://www.aulro.com/afvb/showthread...11#post2238611

Gina found a dodgy evaporator thermostat in his D1.


Should be the same as your soft-dash. This could be your coldness problem.

We all know there's little call for good AC in old blighty so it's never going to be awesome. But if there's an actual temp problem with yours it's likely here.

Thanks.

would this unit be useful ? - maybe overkill....and bit big & bulky for a simple task. Price is bearable...

Temperature Temp Controller Thermostat Relay 12V °C Aquarium CAR Computer Cases | eBay

Originally Posted by superquag

Thanks.

would this unit be useful ? - maybe overkill....and bit big & bulky for a simple task. Price is bearable...

Temperature Temp Controller Thermostat Relay 12V °C Aquarium CAR Computer Cases | eBay

Could be done. Some commercial stuff may not like the electrical noise in a petrol vehicle and you'd need a separate power feed. But it's certainly adjustable enough.