Technical 1.7 D Normaly closed switch on thermostat

[Shafiq Ahmad]

Good Evening

Dear Members,

Last day I replaced thermostat same as shown in attached file, temperature gauge is showing normal ie 80~90. Car heater is not working, fan inside is ok.

I need help to repair heater, Function of switch on thermostat? and if someone can help me to get an electrical wiring diagrm for my UNO 1.7D A/C.


Shafiq Ahmad

 

[multipete]

I doubt that switch will stop your heater working.you must either bleed the heater[get air out from bleed screw].before you do this you must check the heater cock is working.you can do this by removing both heater pipes[in the engine bay] going to the heater and connect a hose pipe to one pipe and see if the same amount of water comes out the other........................

 

[alexGS]

I have no idea what that switch might do... and I've never seen a thermostat shaped like that! I suspect this is because I've never seen the 1.7L diesel engine (and Haynes doesn't cover it).

You're probably best off to find some local advice on that switch/thermostat, since I doubt that any of our members here will have seen one but let's hope someone speaks up and proves me wrong!

On the subject of the heater, that's a lot easier. As multipete said, there's a heater cock (tap/valve) on the right-hand end of the heater matrix, which you can see under the dashboard. Check that the operating lever moves when you move the control on the dashboard. Quite often the lever breaks off when the valve seizes closed. Even if the lever appears to move, it may still not be actually opening the valve.

The best way to be certain is to take off the bottom radiator hose (the main radiator, I mean) to drain the system, then put a plastic bowl in the footwell inside the car, and remove the heater valve (two 10mm nuts). You can see from inspection whether the valve is working. If not, then free the valve off with WD40 etc. and wash thoroughly (or replace), refit the valve, and disconnect the heater hoses from the engine - flush these through with water from a household hosepipe, since if the heater has not been working it's probably full of rusty water and sediment...

-Alex