How to check engine vacuum hoses<br>Check each hose for bulges and swelling. If a hose feels soft or spongy when you touch it, this can indicate damage caused by your car's oil. [substeps] A swollen hose that is cracked and hard is often caused by heat damage.
Engine hoses can break from heat damage. 
( z1 possible :ARG1 ( z2 break :ARG0 ( z3 damage :ARG0 ( z4 heat ) :ARG1 ( z5 hose :part-of ( z6 engine ) ) ) ) )