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1993 Nissan Pickup (D21)

Question: Missing air valve from upper radiator hose?

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psydecheaux, 3.0L V6, Houston, TX, April 27, 2011, 14:09
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I have a 93 Nissan king cab 4x4 V6 3.0 L. Recently it started to overheat after running about 8 miles at 55mph or so. I'm pretty sure my thermostat gave out, and as I was going to drain the coolant, I noticed I'm missing the air valve from the upper radiator hose. Why would that be? I bought Chilton's repair manual for it and the diagram points out exactly where it is.

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  • Answer #1

    Superbob April 29, 2011, 14:42
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    I'm suspicious of a clogged radiator or a defective head gasket if the truck overheated driving straight and level at 55 mph. Anything's possible, could be a faulty thermostat too. You don't mention whether it lost coolant.
    About the hose, it's possible that the hose has been replaced with a hose without the bleeder valve. I'd guess that would have been cheaper than a hose with a valve. If you need to bleed air, you probably could do it by loosening a hose clamp and allowing air to bleed at the hose connection. You could also buy a hose with an air bleeder, it may only be available at the dealer if at all.

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