Using heat on stuck car Bolts
Using heat on seized up car Bolts
If all else fails to move a nut, bolt or screw, heating it up may help to release it. You can do this with direct heat, from a blowtorch, for example, or indirect heat from boiling water. Only a gentle warming is needed - so if using a blowtorch do not play a hot flame on the nut or bolt for too long.
Remember, also, if heating something below the car that heat may pass through the floor and set fire to carpets or damage wiring on the other side.
Remove anything flammable, therefore, before you start. Also ensure that naked flames are kept well away from fuel lines, tank and carburettor and any rubber, plastic or wiring insulation
If this is difficult, make up a heat shield from a tin can and place it between the flame and fastening (fig 1).
(fig 1). Make a heat guide to protect surrounding areas
Boiling water can be poured directly over a fastening if it is accessible from above, but make sure none enters electrical components.
If you want to heat up bolt heads or nuts accessible only from below, hold a container of boiling water close to them so they remain immersed for a minute or two (fig 2).
After you have heated the fastenings, spray them with releasing fluid and they should come undone more easily.
Do not worry if the releasing fluid just turns to steam when it hits the bolt or stud - some of it will reach the threads.
(fig 2). use boiling water on car bolts