Rear water cooling hoses. When to change?

I currently have the transmission off of my 94 trooper 3.2l dohc and for the first time I can see the rubber cooling hoses. These hoses have never be changed and I was wondering at what point does someone tackel the job of changing them. Even with the transmission off I can see no way of replacing them without removing the spark plug coils and I do not know what else. Has anybody evey changed all of these hoses with the motor still in the car? Also is their cooling hose sandwiched between the intake manifold and the top of the block? It appears that the cross over cooling mainfold in the back is made of aluminum. Can one expect this to be very pitted to the point that a new replacement hose will not seal without a lot of sanding or worst yet replacing the cooling mainfold. I am thinking of how some thermostat aluminuin necks are sometime pitted beyond repair.

thanks for your time

I currently have the transmission off of my 94 trooper 3.2l dohc and for the first time I can see the rubber cooling hoses. These hoses have never be changed and I was wondering at what point does someone tackel the job of changing them. Even with the transmission off I can see no way of replacing them without removing the spark plug coils and I do not know what else. Has anybody evey changed all of these hoses with the motor still in the car? Also is their cooling hose sandwiched between the intake manifold and the top of the block? It appears that the cross over cooling mainfold in the back is made of aluminum. Can one expect this to be very pitted to the point that a new replacement hose will not seal without a lot of sanding or worst yet replacing the cooling mainfold. I am thinking of how some thermostat aluminuin necks are sometime pitted beyond repair.

thanks for your time sounds like the perfect time to do all that. under the intake manifold there is another metal pipe that has 0-rings that harden and leak. i've not heard of the crossover coolant manifold requiring replacement, nor the pipe under the intake manifold that needs the 0rings replaced (although a different but similar pipe on rodeos has been known to get corroded and weak and when disturbed gets weaker).

//bc

How big of a job is to pull off the intake manifold to replace that o ring.
thanks

I have done it, and it is a bit of a job, owing to the need to clean up gasket surfaces, remove wiring harness connections, etc; You have to pull the intake plenums off, requiring new gaskets there, and drain cooling system then remove knock sensor in order to get out the tubes (2) of them. Not a daunting job but pretty time consuming. first time I did it it took about 5 hours (in the cold)!

Wow 5 hours to replace those rear hoses. I think I will wait another year before taking on that project. Have you any idea of what age or miles they usually give out.

thanks

I actually have not seen more than a couple of posts regarding O ring leaks there, so I would not expect it to be a thing you have to take care of right away if you don't have a leak now. On the other hand, if you pull the motor mount bolts, you can probably move the engine forward enough to make it easier to change the rear hoses.

I was going to wait another year to change the rear hoses in my 89 Troop.
Hose popped on the highway and it overheated before I knew there was anything wrong.
R.I.P.

I hope I do not end up with my hose popping too, but replacing the transmission was a big enough job as it is. I have the DOHC and it seems that this engine has less room to work on the the SOHC engine. When it finally comes time to change the rear hoses I will replace valve cover gaskets to take care of the leaking oil problems as well.

On a '94 truck....sorry, but with the tranny out and the hoses more accessible, you'd be a fool not to change them. They are 13yrs old!

This is exactly how I too lost an '85 Toyota, thought some hoses would get me another year.....two months later we were shopping for a new engine all together. I haven't played that game since....the Rodeo's hoses were ALL replaced at 10yrs of age, even the little ones.