I had to bypass my heater core. I snaked a hose from the input pipe around the motor and tied back in at the thermostat BYPASS HOUSING. I started with a 5/8 hose piece to a 3/4 elbow back to a 5/8 hose snaked to a 1/2 in. elbow tieing in at the bypass. still running hot. please help

Thermostat? engine cooling?
2 engines, here, LYA adn LY7.
nobody here posts engine, why do that?
so ill post only for 1.
the LA1
here are the steps.
NO FSM Sux huh? nor an alldata.com account, why not that? 15 bucks?


STAT out.
Remove the air cleaner and duct assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls - 3.4L.

Drain the coolant until the coolant level is below the thermostat. Refer to Cooling System Draining and Filling (Refer To List 1) .

Remove the crossover exhaust pipe. Refer to Exhaust Crossover Pipe Replacement (Refer To List 2) in Engine Exhaust.

Remove the radiator hose from the thermostat housing.

Remove the thermostat housing bolts and clean any sealer from the bolt threads.

Remove the thermostat housing and gasket.
remove STAT
next is crossover page.

Disconnect the battery ground (negative) cable. Refer to Battery Negative Cable Disconnection and Connection (Refer To List 1) in Engine Electrical.

Remove the throttle body air inlet duct.

Drain the coolant from the cooling system. Refer to Cooling System Draining and Filling (Refer To List 2) in Engine Cooling.

Remove the inlet radiator hose from the engine. Refer to Radiator Inlet Hose Replacement (Refer To List 3) in Engine Cooling.

Remove the thermostat bypass pipe. Refer to Thermostat Bypass Pipes Replacement in Engine Cooling.



Remove the exhaust crossover heat shield bolts.

Remove the exhaust crossover heat shield.

1. Remove the exhaust crossover pipe studs/nuts.
2. Remove the exhaust crossover pipe.

end , remove.

now the bypass pipe FWD cars SUCK

1. Disconnect the left engine mount strut from the engine.
2. Remove the heater hose from the bypass pipe.
3. Remove the thermostat bypass pipe to throttle body nut.
4. Use the J 38185 in order to remove the thermostat bypass pipe hose clamps (1,5).
5. Remove the thermostat bypass pipe to cylinder head nut (3).
6. Remove the thermostat bypass pipe bolt (4).
7. Remove the thermostat bypass pipe hose.
8. Remove the thermostat bypass pipe.

sigh.....
why not log in to alldata.com
read the page then ask ques tons that are not clear.
and next time post the engine type.
above is just 1 engine.

take a short piece of pipe and put in between the heater core hoses and tie it up so it wont fall against the exhaust hreader..

Find two small hoses, probably about as big around as a man's thumb and black. These are not wire bundles. They go into the firewall behind the engine, most likely on the passenger side. Take off the hose clamps and pull the hoses off the heater core ends, Buy yourself a short piece of pipe the same size as the heater core, put the hoses on either end and tighten down the hose clamps. Anchor it somewhere with zip ties so it does not flop around under the hood and you are done. Move south, going to be cold in there this winter. You are not going to have any defroster either..

Paul, if you mean "radiator hose" then the part is the thermostat housing.

Perhaps the part is the bypass valve, which causes the heated water to "bypass" the heater core if the core is restricted.

Too much blockage in heater hoses or heater core.
Bypass valve may be stuck on "bypass" .

1. Remove bypass "Tees", but don't discard.
Replace with straight-through hose fittings.
The core may start leaking under the water pressure since there is no bypass hose.

Once the heater starts working, put Tees back in place. You need bypass protection or the engine will overheat.

No, you just won't have water flow through the heater core, Coolant flows through the engine through the lower radiator hose as the water pump sucks it out of the radiator and pushes it through the engine. It then flows out the top radiator hose when the thermostat opens. It then flows into the radiator to cool off.

Is your heater core leaking?

your local dealer will get you one.or take the pipe to some place where they make hydraulic pipes.They will help you,I now its not an hydraulic pipe but they can still make one for you.

If you want to bypass the heater core, easiest was is to remove both hoses from the heater core, get a hose connector and 2 hose clamps.

Other than that, you could buy a few feet of some heater hose at your local auto parts store, and go from the water pump to the thermostat housing (although this would bypass your temerature sensors, would probablly cause a check engine light, and may prevent your cooling fan from working properly).

I don't see any parts store anywhere offering a "single" bypass hose, nor have I heard of one for this vehicle. If you do need to bypass it, your solution is above.

I hope this information helps you, and I do wish you luck on your repair.

You need to disconnect the two heater hoses going into the heater core. These hoses will go from the thermostat housing or the water pump to the firewall of the vehicle. You can just disconnect the two hoses from the firewall connection and place a nipple in between the two hoses using good hose clamps to connect the two hoses. That is all you need to do to bypass the heater. Good luck.

its not a fuse if the blower motor works , you have a clogged or bad thermastat, bad water pump or your radiator heater core is clogged