HINT: PRINT THIS PAGE AND TAKE OUT TO CAR! Simplest way to do it is: Fisrt drain all the coolant by undoing bottom hose if it's old. If it's nearly 12 mths or more it's old! If coolant is fresh you are going to lose some by just going to the next step. Undo the two nuts holding the thermostat cover on, remove cover and engine lifting eye. Remove thermostat from inside the opening.(Observing which way is UP) Replace thermostat AND the sealing ring with NEW parts (especially the seal). Refit nuts, DO NOT OVERTIGHTEN! Refill correct Coolant mix (50% Ethylene Glycol)through the reservoir. Start engine with reservoir cap OFF,top up with coolant as level drops, but DO NOT overfill!.... run until Temp guage is at normal and NO air bubbles are visible, then replace cap. Check for any leaks under pressure when hot and recheck for correct Coolant level. Recheck levels before and after next drive. Then it should remain constant.
Just go to this website guaranteed you will get your answer. http://www.lakesidedp.com/volvo/Thermostat/
I believe there isn't one.
Why does my car kick over but wont start?
on left rear side of engine block
To change the thermostat on a 1986 Volvo 240DL, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then locate the thermostat housing, which is typically at the end of the upper radiator hose. Remove the housing by unscrewing the bolts, take out the old thermostat, and clean the surfaces before installing the new thermostat with the correct orientation. Reassemble the housing, refill the coolant, and reconnect the battery.
how to replace the thermostat on a 1999 Volvo s70
http://www.matthewsvolvosite.com/2009/02/17/replace-thermostat-volvo-850-s70-v70-c70-or-xc70/
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Where is the starter inhibitor swith on a volvo 1993 260 GLE i ?
In a 1994 Volvo 940, the thermostat is located in the engine's coolant passage, typically near the top of the engine, at the junction where the upper radiator hose connects to the engine block. To access it, you usually need to remove the upper radiator hose and the thermostat housing, which is bolted to the engine. It's important to ensure the engine is cool before attempting to replace the thermostat to avoid burns or injury.
My 1982 Volvo 244GL had a voltage regulator in the back of the alternator so I assume your 1984 is the same
7/8 Inch Socket: