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Re: Install new block heater
I have installed block heaters in lots of vehicles. I typically use the heaters that are in place of a freeze plug. I feel that these give better results and do not compromise the safety feature that the freeze plugs are there for in the first place.
You can pick these up in various sizes at any reputable auto parts store.
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I`m surprised this didn`t come from the factory with a block heater already installed. if so look for an electrical plug like would be for a house hold lamp, somewhere in the area of the battery. if it didn`t come with one when you buy a block heater the instruction tell you were it is to be installed on the engine and position of element.
Answer by Mike Escue,--- To replace the output speed sensor( i just finished doing mine i bought it from ford for 40 bucks and tax if you put the edge on good size ramps and put on the parking brake remove the entire air box on the front right remove the wheel well cover and locate the black cover on the front of the transmission(behind the raidiator)the output speed sensor is at the botom of the transmission and when you remove the front trans cover and the sensor get a bucket or drip pan handy about 3-4 quarts will come out (it holds 10)mercon V the electrical harness is behind the black cover the say remove the valve body you dont have to i tied a wire to the connector and fished the new one back through the front shaved off a couple of hours that way i am not super mechanically inclined but when ford said 800 bucks to replace it i asked for an exploded view and bought the part told them i would bring it back for them to install later
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 coolant system locate heater cores hoses going through firewall you need to buy the radiator flush kit at any auto parts stores. remove heater cores hoses from one end or buy extra long heater hoses same size as heater core hoses in vechicle at auto parts store use the flush kit when you flush through one of the heater core hoses let the other hose drain in a drain pan when you use home garden hose use low water pressure dont use garden hose to the max or you will rupture heater core. your best bet let radiator shop flush whole coolant system. because heater cores hoses are in a tight spot.make sure engine off if you just going to flush out heater core only .after flushing heater core good time to replace heater core hoses.if job too hard or complicated let radiator shop flush out radiator the engine block and heater core because if radiator stopped up or engine block stopped up the gunk and rust will reenter plug up heater core.if you tight on money you can flush out your own radiator.drain out radiator using large drain pan. remove top radiator hose and remove bottom radiator hoses connect to water pump.use garden hose with flush kit part with water pressure not too high put garden hose to top radiator hose run water until clear water run out bottom radiator hose in drain pan,the flush out engine block remove thermostat.if you had another spare thermostat housing with RTV SILICONE SEALANT THAT HAS SET UP INSTALL THERMOSTAT HOUSING BACK TO ENGINE WITHOUT THERMOSTAT FLUSH OUT THE ENGINE BLOCK, WHEN DONE INSTALL NEW THERMOSTAT THEN INSTALL ORIGINAL THERMOSTAT HOUSING WITH NEW ORING WHICH YOU BUY AT DEALERSHIP.IF ALL SOUND COMPLICATED LET RADIATOR SHOP FLUSH OUT COOLANT SYSTEM.
Block Hester's are generally installed in the freeze plugs. There will be three on the front and three on the back. The instruction say rear center so it will be the center frost plug on the rear of the block
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.
It is no a job for a do it yourselfer. I recommend taking it to a qualified repair shop. The heater core is mounted under the dash in the evaperator/heater case and it is a very involved job to disassemble and reassemble the correct way. Sorry.
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.