Hose that attaches to back of thermostat housing is leaking
I have the 4 cyl (2.6) 5 speed. The hose that leads from the back of the thermostat housing and disappears under the fuel injection chamber is leaking. I can see where it goes from there. The repair shop wants $200 to replace a heater(?) hose. I can see where the hose connects to the back side of the thermostat housing but it goes down into the abyss. I tried looking from underneath looking up but still cant see where it goes. Does anyone know where this hose leads. If I could see or find out where it leads I could locate the bottom connection and replace it. HELP !!!
Re: Hose that attaches to back of thermostat housing is...
The hose is a cooling by-pass hose. It makes a big horseshoe and attaches under the front of the intake maniold. I think that if you have small hands and a lot of patience you can likely replace it without haveing to take half the engine apart. (You have to pull the head to pull the intake manifold).
I think if you remove the battery, and have a small bright light you will be able to see where if attaches under the front of the intake manifold. Advance auto sells the by -pass hose for
around $12.00 I think.
Becare if you are probing around there are way too many vaccum lines under the manifold.
If they come off and you don't know where to put them -- you are in deep kim chee. I know I am
in super deep Kim chee now.
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1. Locate the thermostat housing by following the radiator hose from the radiator to the engine block. The metal cover that the hose attaches to is the Tahoe's thermostat housing.
Remove the radiator hose retention clip by manually squeezing the clip tabs together. With the tabs together, pull the hose off the thermostat housing. Drain the fluid from the hose by holding the hose in the air. The fluid will drain back into the radiator.
Remove the thermostat housing by taking off the two bolts with a boxed wrench. Lift the hosing off the engine to expose the thermostat.
Pull the old thermostat out of the Tahoe's intake manifold. Place the new one into the intake manifold with the spring-loaded end inside of the intake.
Replace the old thermostat gasket with a new one. The gasket must remain dry during the installation process.
Place the thermostat housing on top of the thermostat gasket and bolt it into place.
Squeeze the radiator hose retention clip tabs together and slide the hose back onto the thermostat housing. Let go of the tabs to secure the hose into place.
It should be at the front of the engine where the upper radiator hose is attached to the engine. The radiator hose will be attached to the thermostat housing with a hose clamp. The thermostat housing should have two bolts holding it in place. Remove the gbolts(engine cold) and raise the housing up, The thermostat will be underneath. Make sure the new thermostat is facing the rightway when you install it, Don't forget the gasket. Bolt the housing back in place and install the radiator hose and clamp. Replenish any coolant that was lost to bring the coolant level back up. Run the engine long enough for it to warm up. Check for leaks, monitor the temperatureguage to make sure it reaches normal temp without overhearing, and make sure the heater is blowing warm air.
DRAIN COOLANT LEVEL DOWN BELOW THERMOSTAT.PLACE DRAIN PAN UNDER VECHICLE TO CATCH ANTIFREEZE.WHEN DONE PUT ANTIFREEZE SAFE PLACE FROM KIDS AND ANIMALS.WHEN DONE DRAINING SOME ANTIFREEZE.FOLLOW RADIATOR HOSE TO TOP OF INTAKE TO THERMOSTAT HOUSING. LOOSEN HOSE CLAMP REMOVE RADIATOR HOSE FROM THERMOSTAT HOUSING.THEN LOOSEN HOUSING BOLTS.REMOVE THERMOSTAT HOUSING AND THERMOSTAT.CLEAN BOTH THE THERMOSTAT HOUSING SURFACE AND INTAKE SURFACE YOU CAN USE ACETATE OR BRAKE CLEANER AND SCOTCH BRITES ROLL OF CLEAN PAPER TOWEL. AFTER CLEANING HOUSING AND INTAKE SURFACE MAKE SURFACE CLEAN SMOOTH FROM THE DEBRIS WHEN DONE. TAKE THERMOSTAT PUT GASKET SEALER ON BOTH SIDES OF GASKET PUT GASKET TO THERMOSTAT HOUSING MAKE SURE GASKET AND THERMOSTAT HOUSING HOLES ALIGN CORRECTLY.NOW PLACE NEW THERMOSTAT IN PLACE IN THE INTAKE.MAKE SURE THERMOSTAT SPRING END GOES TOWARD ENGINE FACING DOWN.THEN INSTALL THERMOSTAT HOUSING WITH GASKET TO THE INTAKE.TORQUE THERMOSTAT HOUSING BOLTS TO 20 FT LBS.WAIT 1 HOUR BEFORE POURING ANTIFREEZE BACK IN THE COOLANT SYSTEM GIVE THERMOSTAT GASKET SEALER LITTLE TIME TO CURE.SO YOU WONT HAVE COOLANT LEAKS.NOW IF THERMOSTAT HAS THE LARGE O- RING ON IT YOU DONT HAVE A THERMOSTAT HOUSING GASKET THE THERMOSTAT O- RING IS THE SEAL THAT HOLDS COOLANT INSTEAD OF GASKET.WHEN THERMOSTAT AND HOUSING IN PLACE.INSTALL RADIATOR HOSE TO THERMOSTAT HOUSING TIGHTEN HOSE CLAMP.THEN FILL RADIATOR BACK UP WITH THE COOLANT YOU DRAIN OUT.START VECHICLE UP. THEN CHECK FOR LEAKS.
It Depends on which engine you have, this is how it goes for both. I use a little RTV with a new ring as well.
THERMOSTAT REPLACEMENT (4.2L ENGINE)
Removal Procedure 1. Remove the necessary coolant from the radiator. 2. Remove the generator. 3. Loosen the outlet hose clamp at the thermostat housing. Remove the outlet hose from the thermostat housing. 4. Remove the thermostat housing bolts. 5. Remove the thermostat housing from the engine block. 6. Clean all of the surfaces of the thermostat housing. 7. Clean the sealing surface of the engine block. Installation Procedure
1. Install the thermostat housing to the engine block. 2. Install the thermostat housing bolts. Tighten: Tighten the bolts to 10 N.m (89 lb in). 3. Lubricate the inner diameter of the radiator hose with engine coolant. 4. Install the outlet hose to the thermostat housing. Secure the hose with the clamp. 5. Install the generator. 6. Fill the cooling system with specified coolant and concentration. Follow the correct cooling systen bleed procedure for your engine. 7. Inspect all sealing surfaces for leaks after starting the engine.
THERMOSTAT REPLACEMENT (5.3L ENGINE)
1. Drain Radiator and remove the radiator outlet hose. 2. Remove the water pump inlet bolts. 3. Remove the water pump inlet and thermostat from the water pump.
Installation Procedure IMPORTANT: The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly.
1. Install the thermostat and thermostat housing to the water pump. 2. Install the thermostat housing bolts.15 N.m 3. Install the radiator outlet hose. 4. Fill the cooling system with specified coolant and concentration. Follow the correct cooling systen bleed procedure for your engine. 5. Inspect all sealing surfaces for leaks after starting the engine.
The thermostat is located at the upper radiator hose end of the engine. The hose will connect to a housing that will have to be removed in order to change the thermostat.
While you have the thermostat housing removed, make sure you flush the old coolant out and replace with new.
The thermostat is found at the end of the top radiator hose . Find the top radiator hose and follow it to the engine .There you will find a thermostat housing with the end of the hose attached . There will be 2 bolts holding down the housing to the engine. Undo the bolts and pull the housing off and the thermostat will be there.
the open pipe that you took the hose off of is the thermostat housing, you will need to remove this to reveal the thermostat, make sure you use a new gasket with sealant when reinstalling thermostat housing to prevent leaks and dont over tighten the bolts,run both bolts down as far as you can before final tightning