I drive a vectra c 1.8 club on a 53 plate and my heaters will only work on setting 4, as i understand this is the only setting the blower goes at and that it is the job of the resistor block to slow down the blower to 1,2 and 3.

I changed the resistor block and this did not solve the problem

The blower will only click as it is turned to setting 4.

I have read the forums and see that it could possibly be the relay, this is where i need the help, i have taken out the glove box and looked for the blue relay at the top left near airbag but cannot find it for looking.

A detailed description of how and what to look for or even a diagram would be greatly appreciated.

Thanks in advance