I'm assuming 'geyser' is a gas hot water heater. -Always best to say if an appliance is gas or electric - If this is a conventional gas water heater then the thermostat will be underneath it, near the gas burner, so the tank will not need to be drained. - - Electric heaters often carry a 'relief valve' on top or on the side, (some people have been known to call this a thermostat.) and this does require lowering the water level before changing, not emptying, just lower than the part you are changing. In either type, make sure the gas or electricity is turned OFF before working .
The thermostat in a 1996 VW Golf is located by following the lower large hose of the radiator. Before removing the thermostat be sure to drain the cooling system.
Follow the upper radiator hose from the radiator down to where it hooks up to the outlet. Outlet is held in place with 2 bolts. Remove the bolts and there is the thermostat. Drain coolant out first before removing thermostat.
The thermostat is located on the front left of the engine housed in the lower radiator hose that attaches to the engine. You remove the thermostat cover which exposes the thermostat gasket and thermostat. You must disconnect the negative battery cable. Remove the fresh air duct, remove the air cleaner, drain the engine coolant before removing the thermostat cover.
First of all make sure that the power to the geyser is off, test to make sure. you then need to drain the geyser. make sure that the tap supplying the inlet pipe is turned off, open the valve on the drain cock slowly making sure that the water is falling into the drip tray, open the valve as much as is needed or all the way if possible. This will take anywhere between 30 to 60 minutes to drain. then remove the power cable to the thermostat and or to the element. in some geysers the thermostat will sit next to the element and in others the thermostat will be part of the element. in the latter you will need to remove the thermostat by simply pulling it away from the element. you will now need a geyser spanner to be able to remove the element, in some instances you will need quite a lot of leverage as the elements do tend to sit pretty tight. when the element is lose and out make sure that the rubber seal came off properly as well. you'll need to clean it thouroughly before inserting the new element with its new rubber seal, screw it back into place, ensring that you don't cross the thread as you're doing this and fasten properly, insert the thermostat again and reconnect the power cables. do not switch on the power before the geyser is full otherwise you will burn the element out. turn on the water tap to the geyser and open all the hot water taps in your house. the geyser will be properly filled when the water is flowing from all the taps without any air bubbles. you may now switch on the power.
Disconnect the battery and drain the coolant.
How to change thermostat: Drain coolant by removing drain plug on radiator. Locate lower radiator hose and follow it to engine block. Pull the hose from engine block to expose the fitting/thermostat cover. This fitting is held on with two 10mm bolts. Remove to expose thermostat.
Start off by removing the top engine cover carefully so that it does not brake............Drain the cooling system.Partially drain the cooling system.Remove the air cleaner assembly.Remove the radiator outlet hose from the thermostat housing.Remove the bolts securing the thermostat housing to the water pump inlet.Remove the thermostat and the gasket from the water pump housing.
before you change the thermostat make sure the engine is cold. you don't have to drain coolant, unless you want to replace it also. there will be a minimal coolant loss if you decide not to drain but can easily be top off. If you follow the lower hose to the engine, you will see a the end of hose attached to the themostat housing. Remove the housing bolts (2) using a 10mm socket with extension. After removing this, you'll see the thermostat!
Its at the base of the upper radiator hose, under the outlet. Drain some coolant out before removing this if you don't want a mess. Make sure all old gasket is clean before putting a new one in.
In most cases you only need to drain a few qts. This is done to avoid making a mess in the process.
NO, but some will leak out when loosening the radiator hose. A LOT will leak out when completely removing the hose, so have a bucket on standby.
Follow the upper radiater hose from the radiater to the engine block. The part that the hose attaches to on the intake manifold is the thermostat housing. In the housing is the thermostat. Just two bolts attaches thermostat housing to the intake manifold which is attached to the engine block. If you replace the thermostat yourself make sure that you see how the thermostat was before you take it out. The spring side faces into the intake manifold. Drain some radiater fluid before removing the housing or you will spill fluid all over your engine block. Best to do this with the engine cold. Buy a gasket and high heat antifreeze resistent silicon gasket sealer when you buy the thermostat.