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Car Forum / Nissan / Nissan Cars / May 2005How to Change O-Ring in ThermoWax Unit 96 Sentra?
Hi, I think I have isolated a coolant leak in my 96 Nissan Sentra GXE, to the O-Ring inside the thermowax unit. But looking at the setup leaves me stumped. I see the shaft coming out of the brass cylinder, and I see the green discoloration around the shaft (leaking antifreeze?). But I see no O-Ring. Is the O-Ring inside somewhere? The thermowax unit is inside a box-shaped piece on the throttle body. Looks like I can remove this box-shaped piece by removing 4 bolts. Will the thermowax unit come out somehow if I remove the box-shaped piece that contains it? Looks like the thermowax unit is "pressfit" into the box-shaped piece. Do I need to bang the thermowax unit out to get to the O-Ring? Thanks.................... I hate to be ignorant... but what is a thermowax unit? Professor www.telstar-electronics.com The thermowax unit contains wax that melts when heated by the hot coolant. When the engine cools down, the wax hardens again. *Somehow* (maybe by expanding and shrinking) the result is that a shaft is pushed out ( I think) of the thermowax unit when it heats up, and then the shaft is pulled back when it cools down. The shaft pushes on a cam which controls the idle speed. ive worked on cars for 15 years and have never heard of a thermowax unit > The thermowax unit contains wax that melts when heated by the hot > coolant. When the engine cools down, the wax hardens again. *Somehow* > (maybe by expanding and shrinking) the result is that a shaft is pushed > out ( I think) of the thermowax unit when it heats up, and then the > shaft is pulled back when it cools down. The shaft pushes on a cam > which controls the idle speed. I did a search on "thermowax" in this group and found 3 additional references to "thermowax" so it does exist, apparently. The Nissan dealer knows about it too. They have the O-ring for it. Well... that's a new one on me. Professor www.telstar-electronics.com My 99 Altima has one too. My 94 didn't have one though. I have no idea why they went with this setup, unless it was to help prevent the throttle from sticking shut since the thermowax keeps the throttle open when cold. > Well... that's a new one on me. > > Professor > www.telstar-electronics.com |
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