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Tool Sources.  See the following links for a variety of special-purpose tools for Volvo cars:

Homemade Cooling System Pressure Tester. Here's what I've rigged up for both pressure testing the cooling system and bleeding the clutch and brakes: I found an old bottle cap that has the same threads as the coolant reservoir. Then I bought $1.00 worth of tank valves and screwed one into it. If you don't have such a cap, then an old coolant reservoir cap should work even better. When I need to use it, I take the gasket out of the coolant reservoir cap and use it in my pressure cap. I connect a $5.00 bicycle pump (with built in pressure gauge) to the cap and presto. Since the brake reservoir has the same type orifice, it can also be used to pressure bleed the clutch and brakes.

Homemade Exhaust Gas Leak Detector. If you suspect a head gasket leak resulting in combustion gases entering your coolant, you Fluid Transfer Bottlecan test for this using special test fluid which turns from blue to yellow in the presence of exhaust gases. Mityvac has a fluid transfer bottle in their vacuum pump kits (pictured) or you can make one using a small jar and a lid with hoses through it. Fill the bottle part way with Lisle testing fluid 75630 for gasoline engines. Place one vacuum tube on your Mityvac or on a source of engine vacuum to pull gases through the bottle. Place a short tube on the other side of the bottle cap to extend down into the fluid to force the gases to draw through the fluid. Seal the coolant reservoir top with an old reservoir cap through which you have glued the sampling hose. Run the engine and draw vacuum: gases will rise from the coolant in the reservoir, exit via your hose through the reservoir cap, enter your test chamber by bubbling through the fluid, and if it turns yellow you have an exhaust leak into the coolant.

Heater Core Unclogger Tool

Homemade Heater Core Cleaner. [Eric Mollerstuen, courtesy of IPD] If you fail to change antifreeze, your heater core can clog with deposits. For clogged heater cores, you can fabricate a PVC pipe, one end of which contains a "Drain King" pulsating drain declogger and the other end fits into the heater hose. Buy the parts (Drain King, 2 inch PVC pipe about a foot long, a 5/8 inch short pipe, a joining fitting and a tube of adhesive) at a local hardware store. Glue the parts together so that the open 2 inch pipe terminates in the 5/8 inch pipe. Insert the small pipe in the heater inlet hose, place the Drain King in the open end of the pipe, and turn on the water. If your core is badly clogged, it will take a few seconds for the pulsations to blast away the deposits. For Eric, this worked fine and eliminated the need to replace the core. [Editor's Caution] If your core is corroded, this may be enough to cause it to fail and leak. View it as a last resort only.

B230F Crank Holder Tool-Method 1. 

[Don Foster]  Here is the design for the tool used to secure the crank pulley to remove the bolt while changing the timing belt.  [Editor's Note: You can purchase this tool number 5284 from Volvo dealers and from IPD for about US$39; see the FAQ section on Timing Belt Tips]