2004 Ford Explorer Q&A
2004 Ford Explorer Question: I've can not figure out why the thermostate housing keep cracking?
they are plastic and both surfaces need to be very clean as not to bind while tightening. where did you buy yours? aftermarket tend to be thinner plastic - globalhelper
DO NOT overtighten!! O-ring type seals do not need to be very tight , overtightening will stress the housing and warp it causing it to fail prematurely even with a good (OEM) part. - ziptie12