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Sounds like you popped a hole somewhere and coolant has escaped to the point where system is now undercharged. When that is the case the low pressure sensor prevents the AC clutch from activating, hence no cooling.
The compressor is cooled by the return gases and when they are insufficient, there is no cooling for the unit and the sensor activates to prevent destroying the compressor.
Sounds like your cooling fans on the radiator are not working. The fans are activated by a thermol switch on the engine or radiator reading the coolant temperature and an A/C switch. When the coolant is too hot the fans should activate cooling the system down. And, when the A/C is on the fans should also activate in order to cool the condensate so the A/C would work.
When you are driving, the movement of the vehicle throught he air is providing enough air flow to keep things cool and functional.
I would check the radiator fan fuse or fuses first. If those are OK I would try to run the fans with 12 volts and a ground that I supply just to see if the fan motor(s) actually run when powered. If the fan don't run when powered then the fans are bad and will need to be replaced. If the fans do run when you power them manually, then something is not allowing the power to activate, like a relay, control unit, or wiring.
It will take a little diagnostics, but it is not too difficult to chase it down.
Most likely needs freon,when it has no freon,the compressor will not come on,and the fans will not come on unless the compressor has freon in it to activate the cooling fans from the high side pressure switch.
It sounds like your rear temp. blend door is malfunctioning. You might could get a known good controller from (ebay,junkyard,craigslist) then plug it in. If this does not fix, it is probably a blend door actuator issue.
I have a seicento sporting myself. No major issues but sump gasket needs replacement every two to three years, water pump very fragile and requires regular replacement of cooling water as per maintenance schedule, otherwise problems are guaranteed. Similarly for heater blower using hot cooling water. Radiator is a hassle to replace. However overall it is a fun car to drive.
hey that was a cool car in its time! is it that 2 seater? anyways, u definitly have to get the bertone rims, they were 14 inches and were produced on other sporty fiats as well. also x19 bertone rims 14 inch would definitly give it a sporty look, and they would fit without problems. also a front extension to the bumper would change d look. just see some pictures of modded 124,s and u can copy the design, and give it to a fiberglass guy. its easy to make. well basically thats it... then its your creativity to make it look d way u like