exhaust manifold cool down time

[dizdak]

just curious, drove my truck 75 miles last saturday to have assistance with IP swap and injectors all that good stuff, 75 miles, running 65mph most of the way there.. With in 10 minutes 15 mins max of getting there my exh manifold was cool enough i could hold my hand on it... this is in FL on a mid 70s temp morning.. is this normal for them to cool that quick or run cool enough to not be that hot?

 

[77f250diesel]

Keith, I'm pretty sure there's no thermostat or it's stuck open, could also be the reason your getting very little heat.

Dennis

 

[dizdak]

i guess i will check that while i am fixing or replacing all the other stuff...doing the glow plugs this weekend and putting a new starter on..

 

[79jasper]

Easy way to tell on the thermostat is how long it takes for your heat to work. Around 10 or 15 minutes should be normal. If it's taking forever, must likely it's gone or stuck open. DO NOT buy those "fail safe" one's. One quick hot/hard run will make them stick open.