Radiator Pressure

I have repaired the blanking plug in my 1988 Volvo Estate.
I have to use the car tomorrow but have just found by chance that there is
pressure escaping from the repair I did.
How can I use the car by reducing the radiator pressure.
What if I only screw the cap on the expansion tank a few turns rather than
up tight, would this act as a pressure release to allow me to drive the car
tomorrow.
Another option would be to make a small hole in the tank pressure cap, this
would also stop the engine / rads from reaching to much pressure,
Any thoughts

 

You can leave the cap loose temporarily, but this is not a good idea.
Make sure that the cap is releasing pressure properly (if you can't
check it, buy a new one), and make sure you cleaned up the plug/rad area
properly, and didn't damage the new seal when you installed it.

--
Mike F.
Thornhill (near Toronto), Ont.

NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)