A/C blower intermittent. Found relay in under hood box requires “wiggling “ to restore function of motor. Been messing with this problem for years. Have changed the relay several times but the problem is consistent. Concluding the problem is a bad connection in the relay box. Attempted to disassemble the box to gain access to its under side connections but was unable to get the box open to inspect. Is there a tool or secret to getting the box open to inspect terminals for that relay