Heater blower only works on high fan speed

Ive read something info on the web about a blue relay on the back of the fuse box on the passenger side of the dash which im waiting for it to be delivered. Will let you know if this works. Thanks for the reply

It was the blue relay on the back of the fuse box. All fixed now
I just wanted to recap what went wrong with my car so other vauxhall user don't suffer with this problem.

If you have ever been through a car wash or had plenty of rain and noticed the front passenger side footwell is wet then this for you.
There is a drain hole in front of the pollen filter. When this blocks up water can only drain out one way and that is through your blower fan. Which then end up in your car i.E passenger side carpet.

This water will damage and rust your fan motor. 1st sign is the resistor blowing. You will only be able to use 4 on your control settings this will also cause damage to the relay and fuse. The resistor controls settings 1, 2 and 3 by slowing the fan down.
If this problem is left you will end up having the replace the blower fan which I did. This is costly.

Unblock the drain hole and this solve the problem and not cost you a fortune in the future. I hope this help anybody having the same problem.

Sorry about spelling and grammer