One bolt thermostat housing. How do I get the housing off?
I suspect the thermstat housing needx to rotate maybe 1/4 turn to allow removal. With the one bolt removed, the housing rotates CC wise with the outlet moving from about 6 to 5 oclock, but then it hits part of the air intake manifold. I removed two bolts from the manifold and the manifold wiggles but looks like it has a 3/8 metal tube near the bottom that won't allow me to remove the part. There also is a small electrical part screwed to the bottom of the air intake that if removed might allow more rotation in the housing. I am leery of removing that part as it looks like some small pieces may fall out.
I need confimation that the housing needs to rotate, and what do I need to remove to allow more rotation in the housing.
Re: One bolt thermostat housing. How do I get the housing...
Remove the other bolt from the thermostat housing and remove the housing. My fear at this point would be that by removing intake manifold bolts and wiggling the manifold you may have damaged the intake manifold gasket set, which is a much more indepth repair
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Engine Coolant Thermostat and Housing Replacement, Tools Required: Hose Clamp Pliers.
IMPORTANT:Use the hose clamp pliers to gently release tension on the hose clamp until the hose clamp lock feature engages allowing removal of the hose.
Fig. 1: View Of Radiator Inlet & Outlet Hoses
Drain the cooling system.
Using the hose clamp pliers, release the tension on the hose clamp at the thermostat housing and reposition the clamp.
Remove the radiator outlet hose from the thermostat housing.
Place the drain pan under the drain valve on the radiator. Loosen the drain valve and allow the radiator fluid to drain. If the drain pan is clean, you can reuse the antifreeze.
Loosen the hose clamps on the upper radiator hose using a socket, screwdriver or pliers, depending on the type of hose clamp on the hose. Pull the hose off the radiator and thermostat housing. If the air filter intake hose is in the way, loosen the clamps and remove the intake hose (on some engines).
Unbolt the two bolts in the thermostat housings. Pry the thermostat housing off the engine block. Pull the thermostat out of the housing. Remove the old gasket and discard. Slide the new thermostat into the housing the same way the old one came out. Install the new O-ring seal in the housing. Coat the housing with a thin layer of silicone gasket maker. Allow the gasket maker to dry.
Slide the bolts into the thermostat housing, then line the bolts up to the bolt holes on the block. Slide the housing down the bolts until it touches the block. Turn the bolts in by hand to get them started. Tighten the bolts to 89 inch-pounds of torque.
Reinstall the upper radiator hose. Tighten the radiator drain plug. Fill the cooling system. Start the engine with the radiator cap off. Allow the engine to come up to operating temperature. Look for leaks. Watch the level of the water in the radiator. Fill as needed
It is at the end of the upper radiator hose under the housing that the hose connects to. Remove the hose from the housing, remove the 2 bolts that hold the housing in place. Remove the housing and turn it over to expose the thermostat. Rotate the thermostat counter clockwise to remove it from the housing. When refitting the thermostat the side with the spring points away from the housing.
Before servicing the vehicle, refer to the precautions at the beginning of this section.
Remove or disconnect the following:
Negative battery cable
Coolant until level is below thermostat
Support bracket located near rear of alternator (A/C Vehicles)
Alternator drive belt by attaching a wrench to the pulley mounting bolt of the automatic tensioner, rotating the tensioner clockwise to release belt tension, and removing the belt:
Alternator mounting bolts, but do not remove any wiring at alternator
4WD indicator lamp wiring harness (4WD vehicles)
Alternator and position aside
WARNING When servicing constant tension hose clamps, use only tools designed for servicing this type of clamp, such as special clamp tool (number 6094). Always wear safety glasses when servicing constant tension clamps. Always replace constant tension clamps with the same numbered clamp.
Radiator hose clamp and upper radiator hose at thermostat housing and position wiring harness aside to gain access to thermostat
Thermostat housing mounting bolts, thermostat housing, gasket and thermostat
Clean intake manifold and thermostat housing mating surfaces.
Install or connect the following:
Thermostat (spring side down) into recessed machined groove on intake manifold
Gasket on intake manifold and over thermostat
Thermostat housing to intake manifold
NOTE: The word FRONT is stamped on housing and must be placed towards front of vehicle.
Housing-to-intake manifold bolts.
Torque to: 200 inch lbs. (23 Nm)
Upper radiator hose to thermostat housing
Alternator (A/C Vehicles)
Torque to: 30 ft. lbs. (41 Nm)
Torque to: 40 ft. lbs. (54 Nm)
Drive belt over all pulleys except idler pulley
Socket/wrench to pulley mounting bolt of automatic tensioner and rotate clockwise
Belt over idler pulley, let tensioner rotate back into place and remove wrench
Simple fix..... Just need to replace the gasket. Go to your local auto parts store and get a new gasket for your year, make, and model of car. Should only be $5 -$8 for the gasket. Take the housing apart, 4 -1/4" bolts, I believe, take them all the way out. Take the housing off, but be careful not to lose the thermostat, as it just sits in there loosely. (You will also lose some fluid from the radiator, so you may want to place a catch-pan underneath the car where the antifreeze will spill). Next, you will have to scrape the old gasket off both sides of the flange using an old putty knife, razor-blade scraper, or even sandpaper. Then just fit the new gasket in so that the bolt holes line up, and bolt the flange back in place. Don't over-tighten the bolts due to they are under quite a bit of heat and pressure and you don't want them to rupture. Good luck.
Follow the upper rad hose to the engine and that housing there contains the thermostat. It is kind of hard to get to but it depends on you. Be sure to put the spring on the new thermostat TOWARDS the engine.
3 tools should be needed for this job..screwdriver (flat head), 8mm deepwell socket w/extensoin and maybe some pliers to rotate the radiator hose clamp away from 1 of the 2 bolts required to remove the t-stat housing.
Step 1. remove the airbox assy. just loosen the clamp with a screwdriver at the throttle body, a pull back the airbox assy and unhook all the elec connectors. under the throttle body you will see the radiator hose leading to the t-stat housing. it's a little tricky to get to, but should not be a problem if the hose clamp is not in the way of one of the bolts. if it is, just rotate the clamp by sqeezing it with pliers. (that's the hard part) but hopefully it won't be in the way.
step 2. remove the bolts with an 8mm deepwell socket. you'll need a deepwell cuz the bolt on the left is also used to hold a clip for the spark plug wire holder otherwise known as a "stay". REmove the plastic stay to get to the bolt. then remove the 2 bolts and pull the housing back with the hose still connected.
step 3. remove t-stat and any gasket material so that both surfaces are clean.
step 4. replace t-stat and gasket. use gasket sealer with the gasket that comes with the t-stat.. re-assemble everything and you are done. NEVER EVER REMOVE a radiator cap from a WARM/HOT ENGINE!!What to look for:
If the vehicle has a radiator cap - run the engine with the cap off and watch for coolant flowing past the opening. This is a good thing - the thermostat if fine
CAUTION If the radiator is filled to the top with coolant and the engine is run without the radiator cap in place, the coolant will expand and spill over as the engine warms up. Be ready to put the radiator cap back on.
Feel the top of the radiator hose to confirm that the coolant is warming up. If the engine is overheating, but the top hose is still cool to the touch, the thermostat is stuck closed and must be replaced.
Drain enough coolant (into a clean container) to get below the level of the thermostat housing
Remove the upper radiator hose from the thermostat housing. See TIP below
Remove the mounting bolts and remove the thermostat housing.
CLEAN BOTH SURFACES of ALL gasket material! Any gasket left behind will likely cause a leak.
NOTES: * Compare the size of the thermostat to the old one - make sure the new one matches up * Ensure the thermostat fits into the groove in the block or outlet housing. * The spring side faces the block - If the thermostat is installed backwards, the engine will overheat
Install the gasket - DO NOT USE RTV sealant
NOTE - When a paper gasket is used and the recess is in the thermostat housing, it is a good practice to position the thermostat into the recess and glue the gasket to hold it in place. If it falls out of its groove during installation, the outlet housing can be cracked or a coolant leak will result. Before tightening the water outlet housing, try to rock it back and forth to be sure it is flush. Housings are often cracked during this step.
Reinstall the thermostat housing bolts - tighten evenly
You will need a 1/2" socket with ratchet, and a 1/2" wrench for the actual removal of the thermostat housing. First, remove the air duct from the air filter housing and the air intake connection to the engine. Set aside. Next, remove the upper radiator hose from where it connects to the engine by loosening the hose clamp. At the other end of this part where the hose was removed from is the "L" shape that houses the thermostat and bolts to the engine. This part (housing) has two bolts. The top bolt will require the use of an extension on your ratchet which you will need to insert between the water bypass pipe and the exhaust heat shield before coupling with the 1/2" socket. Loosen the top bolt. The bottom bolt will require the use of the 1/2" wrench, as the socket will not fit due to the location of the heat shield. NOTE: the bottom bolt only needs to be LOOSENED and not removed, as the housing has an open "C" at the lower bolt location allowing the housing to pivot upward from that bolt. After removing the top bolt and loosening the lower bolt, you can pivot the "pipe" end of the housing downward and carefully maneuver the housing out of its location. You should now see the thermostat.
Clean surfaces of the engine and housing well. Insert the new thermostat with the "spring" into the engine and the "bell" outward. Be sure the seal is seated properly into its socket in the engine. Position the housing carefully, making sure not to move the thermostat out of position. Reassembly is the reverse of removal.
In my case, I did not use any gasket seal. The thermostat has a rubber seal on it which works well on its own. Adding gasket seal may make removing the housing in the future more difficult
You'll have to remove the "water neck"...the alum. thing the hose was attached to. The thermostat comes off from the back. Be careful taking it off, it's aluminum. the new thermostat should have a new gasket for the water neck included. Use a little common bearing grease on both sides of the gasket and it will be easier to remove the next time.
Removal Procedure 1.Remove the air cleaner and duct assembly. 2.Drain the coolant until the coolant level is below the thermostat. Refer to Draining and Filling Cooling System . 3.Remove the crossover exhaust pipe. 4.Remove the radiator hose from the thermostat housing 5.Remove the thermostat housing bolts and clean any sealer from the bolt threads. 6.Remove the thermostat housing and gasket. 7.Remove the thermostat. 8.Clean the mating surfaces.
Installation Procedure 1.Install the thermostat. 2.Install the thermostat housing and gasket. 3.Install RTV sealer, GM P/N 1052366 or the equivalent, to the thermostat housing bolt threads. . 4.Install he thermostat housing bolts. Tighten Tighten the bolts to 25 N.m (18 lb ft). 5.Install the radiator hose to the thermostat housing. 6.Install the crossover exhaust pipe 7.Install the air cleaner and duct assembly. 8.Fill the cooling system. Refer to Draining and Filling Cooling System . 9.Inspect the cooling system for leaks. Repair as necessary.