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How do you change the lower intake manifold on a 1999 Suburban?
Cindypric
I just completed this task. I would suggest not removing the upper intake unless you just can't get around it. It is not hard, just time consuming. You will have to move most of your accesories out of the way (alternator and A/C, remove the upper fan shroud and the Power Steering pulley along with the A/C mounting bracket) If you are having the common intake coolant leak problem, I suggest you also spring for a new set of intake bolts. Be careful how tight you torque evrything, remember its aluminum.
Also try and disconnect the fuel lines at the back of the engine, I did not do this and now I have to try and replace the fuel line o-rings.
After disassembly make sure evrything is super clean, if you scrape the intake be careful not to scratch or gouge it.
When you go back together you will need to be very careful of how you position the intake, the front and rear seals are RTV Black and you must clear some obstacles near the rear of the engine so you can place the intake square and straight down on the block.
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