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get a center punch (hardened) steel and be sure you are exactly in the center of the bolt that has snapped off give it a good hit with a hammer so when you place your drill bit in the small dent you made in the bolt you can drill a small hole with a drill bit and 1/8 or 1/4 inch deep proceed to a bit that is the same size as the inter thread area of the bolt if you drill it out at the same diameter of the bolt you will have to use a helli-coil and follow the directions on the helli-coil for you size of bolt to replace the damaged threads.
Drill the center of the broken bolt about 1/4" deep. Using a tapered "easy out" , tap the easy out into the hole then using a tap holder, gradually turn the easy out into the bolt. If you need to add something to help chemically loosen the bolt (rust,corrosion) use a combination of Power Steering Fluid and Acetone in a 50/50/ mixture. If there is rust, this will loosen it up an very short order. If these steps don't work, you will have to drill the bolt out completely and either tap the hole out to a larger size bolt or install a heli coil.
Just an addition helpful piece of info.....be careful when reinstalling the bolts when putting the housing back in. Most thermostat housing bolts are made of aluminum and will break when torqued too much. Just tight enough to seal no more.
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What do you do when you break a bolt that attaches the thermostat housing to the engine?
You drill the bolt out that is snapped off in the engine,with drill bit made to drill through metal. Then use a thread maker,tap. Auto parts stores carry these. I no u can get at autozone. The tap makes new threads.
Where is the coolant bleeder bolt located on a Honda Civic?
On the thermostat housing.
Is it possible to get to thermostat for replacement without removing the exhaust manifold housing on 97 Chevy lumina?
loosen the bottom bolt with a 13 mm swival head socket, do not remove the bolt all the way, take out the top one and the thermostat housing will slide out and then remove the thermostat.
Where is the thermostat located on a 1990 Buick Riviera?
follow the radaitor hose from the top right side it goes directly to the thermostat housing remove the bolt then there is your thermostat
How do you install a thermostat on 95 Chevy Lumina with everything in the way?
It is kind of hard but it can be done, remove air duct between engine and filter housing , remove radiator hose, remove front bolt on thermostat housing, just loosen back bolt quite a bit, the housing is notched and will slide off without removing bolt all the way. thermostat is 0-ringed no gasket. Get a six-pack first.
How do you replace 2004 Buick Century thermostat?
First step is drain the cooling system. Follow the upper radiator hose to the thermostat housing. Remove the clamp from the hose and remove the hose from the housing. You have two bolts holding the thermostat housing onto the block, remove both bolts. The upper bolt can be taken out with a ratchet (13mm) but the lower on is going to give you problems. You will need to remove it with a combination 13mm wrench. Because this area is so hard to get at it will take some time to remove but you can get it out. Once both bolts have been removed you can pull off the thermostat housing. You will notice that the housing has one hole for the upper bolt and a slot for the lower bolt. This is what is going to save you a lot of pain later on. Here's the trick to putting it together. Don't use the same bolt on the lower block. Get a bolt that is at least a quarter inch longer. The length isn't going to matter because the bolt goes all the way through the mount. You will now hand thread the lower bolt a couple of turns to hold it into the housing. Put a little grease on the rubber seal to keep the thermostat from falling out of the housing and install the new thermostat. Because the lower bolt goes into a slot and because it is longer then the original bolt you can actually work the thermostat housing against the exhaust heat shield and over the thermostat that is sticking out of the housing and slid the slot onto the lower bolt. Then tighten the bolts down. This will take some time but it will save you a chunk of change. You now owe me a beer.
Geo Prizm 90 When replacing thermostat housing tightened the 10 mm nuts too much and sheered off the bolt closer to the front of the car how do you replace that bolt It failed to turn with a vice grip?
You can remove it with an easy out tool. You drill a small hole in the center of the bolt and insert the easy out tool and simply turn it to remove the broken bolt.
Where is the thermostat located on a 1991 Mercury Capri?
The thermostat is located inside the housing on the right side of the engine. There is about as big as a woman's wrist running from the radiator to the engine on the right. It connects to the housing in question. There is generally a bolt on the top and nut on the bottom of this housing that will needs to be removed. Inside lies the thermostat.
Where is the thermostat on a 2005 Chrysler town and country mini van?
Just follow the top rad hose to the engine. Where it attached is the thermostat housing. undo bolts, replace thermostat (the right way up) with a new gasket and bolt housing back on.
How to change thermostat on 2003 Aztec?
first drain coolant, then remove two electrical plugs on air filter hose connected to throttle body. then remove same hose. remove metal coolant line that goes in front of thermostat housing, remove throttle body. Then you have good access to thermostat housing. You do NOT have to remove the exhaust crossover pipe, as I have read in many places. remove the nearest bolt on the thermostat housing, the far est bolt is a little harder to get to, because of the exhaust pipe. loosen the far bolt just enough to slide out the thermostat housing, there is a slit on the bolt hole on the housing so you don't have to remove the bolt completely. then clean mating surfaces and reinstall in reverse order, if the gasket on the throttle body tears, a new one is only 2.00 dollars. I just had mine done and I got to watch. I hope this helps someone.
Where is the thermostat located on a 1990 Mazda 323?
== == It's located within the thermostat housing, to the right side of the engine... follow the large rubber tube coming from the radiator and it shall lead you to the housing, which is held in place by two bolts. Warning: if you take the housing off, to replace the thermostat, be gentle with the thermoswitch, and it is also very fiddly to have the thermostat centralised on the housing when you bolt it back on.
How to change the thermostat in a 2002 Oldsmobile silhouette mini van?
Tranny Side of the Motor, under the throttle body. There are 2 bolts holding the Thermostat housing to the block, and the lower bolt hole is slotted so you don't need to pull that bolt all the way out to get the housing off so you can get at the thermostat... Hope this helps someone!
