Find great deals on eBay for fiat punto heater wiring loom. Firstly make sure that you have the correct replacement wiring loom. There are two different versions - one for cars without air-conditioning and one for cars that. Fiat being Fiat , you can only buy the whole heater loom for around £5 more from a dealer.
Vauxhall do a wiring harness repair kit. For sale on Ebay for £3 it fits fine and does the trick (see picture below).
Trying to source a secondhand one is har over scrap yards confirm these parts sell immediately, you are lucky to find one if you do. This is the heater motor resistor loom to fit on the Fiat Grande Punto. This fits aircon and non models, if yours have climate control (digital heater panel) then. FIAT PUNTO ENGINE WIRING LOOM FROM 1. THESE HAVE BEEN PROFESSIONALLY REMOVED AND ARE THE GENUINE FITTED FIAT LOOM. Free delivery on eligible orders.
Vehicles affected include the Punto , Grande Punto and Punto Evo. Owners may experience an intermittent heater blower fan, on one or more of the speed settings, or the fan may not work all, or will only work on full power, or may be stuck on full power.