thanks everyone for your reply's, I tryed a coolant temperature sensor from a 88 Volvo240 and it did the job of the thermal switch, so I you can in some applications use these interchangeable when used with cold start valve, at least from my newest experience,

On my 1981 volvo 245, I'm having a cold start thermal time switch issue, I know how to resolve it, but thats not my question, My question is that my by brain is telling me a volvo "temperature sensor" works the way same as a cold start "thermal time switch" which cost increasingl...