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The frost plugs that block heaters go in are along the sides of the engine block. About midway up from the bottom of block where the oil pan mates to the top block deck. 3 or 4 on each side, 1 to 2 inch diameter round metal plugs just slightly recessed in the block. Look below the exhaust manifold, behind the exhaust pipe on the block. Frost plugs are easy to punch out as long as you can get to them.
Punch in one side, and the other side will start to come out-then grab with pliers or vice grips to remove the plug.
When you buy a block heater for your Tahoe, it will come with an instruction sheet, and a diagram of the preferred or recommended frost plug hole to use the heater in. It will also usually show the positioning of the heater element in the block-how to orient the heater into the opening so the element does not touch the block anywhere, but is placed in so the element is exposed in the water jacket of the engine. That make sense? You do not need a sealer, as the block heater has its own O-ring rubber seal. When inserted and tightened down (small wrench or socket, about 3/8 inch or smaller size, do not over tighten-follow sheet instructions), the o-ring should not leak. Be sure and clean that recess well that frost plug was in- get all the rust and scale off with rags or emery cloth (sandpaper).
Not hard at all to install a block heater once the frost plug is removed. Getting access to the frost plug is the devil to deal with. If you are unsure, have it installed for you.
Drain antifreeze -DON"T POUR IT DOWN A STORM DRAIN - then remove valve cover, Remove exhaust from head assembly. On this engine the head is also the intake manifold - it's cast as a unit. Remove carb and remove heater hoses from carb base plate. Remove head bolts and discard. Break head loose from block - may have to smack it a time or two to break gasket loose. Get a buddy to help lift the head off the block - it's fairly heavy. Clean gasket surfaces on both head and block. Install new gasket onto block - pay attention to gasket orientation - it goes on only one way correctly. Reverse procedure to re-install - USE NEW HEAD BOLTS! Silly to try to save $20 bucks on bolts and ruin an engine.
will be around battery harness or through lower grill driverside here is install instructions hope this helps you find it the car never came with a block heater if you have one it was installed aftermarket let me know if you need any more help
Removal & Installation
Factory block heaters are not installed on these
models. If an aftermarket heater has been installed the following
procedure will most likely work. There are two basic types, one for the
oil and one for the coolant. The oil heater usually just slips into the
dipstick tube or replaces the oil drain plug. The following procedure is
for the coolant type.
Remove the negative battery cable.
Drain the cooling system.
When draining the coolant, keep in mind
that cats and dogs are attracted by ethylene glycol antifreeze, and are
quite likely to drink any that is left in an uncovered container or in
puddles on the ground. This will prove fatal in sufficient quantity.
Always drain the coolant into a sealable container. Coolant should be
reused unless it is contaminated or several years old.
Remove the block heater in the same way as the freeze plugs. Some
heater units have a bolt that must be loosened or a V-Clamp that must
be removed to remove the heating element.
Disconnect the heater connector and remove the heater element.
Coat the new heater with sealant, then install the reverse order of removal.
Fill the engine with coolant, connect the battery cable. Start engine and check for leaks
A block heater is installed in one of the freeze plug ports in your block. Drain your cooling system. Then drill a small hole i the center of the freeze plug and screw a self tapping screw into the hole. You can the use a claw hammer or something similar to pull the freeze plug. Then you just install the block heater in the freeze plug's place. Refill your cooling system and let it get up to full temperature checking carefully for leaks. Please rate my answer.
you have to drain the antifreeze find a suitable frost plug and knock it out, install block heater"follow instructions" run the plug to the front avoiding the exhaut manifole and any moving parts , or you can get an inline that just splices in the heater hose, good luck
Supplier of block heater ( parts store) should have a listing if not with heater in package, of which frost plug to remove, as well as positioning of heater. Make sure engine cool, drain coolant via plug in block or rad, and instructions should tell you which frost plug & what position. I normally clean hole surface well with steel wool or scouring pad, then wipe clean with cloth, and add a dab of vaseline or similar grease to surface where "O" ring will sit. Insert plug, Tighten screw, run cord in a safe route away from exhaust etc, zip tie as necessary, and remember to plug in . Add coolant back in to system, heater on to bleed air out and let it run long enough with cap off, to help bleed air out. Check to insure no leak.
Hi ryan, yes my friend the best bet is to drain the coolant,as for the block heater,not sure which side for the sonoma but basically it is a frost plug with and internal element attached to it,once you unplug the cord typically there will be a small screw to remove, use a small punch or whatever will work and pop one side to roll the block heater so you can remove it,simple my fried,by the way a new block heater will come with installation instructions :) have fun and good luck ryan take care.