What goes here?

[Katalyzt13]

What goes in that plug?

[krustyballer16]

Temp sender?

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[Jeep Driver]

Yep, likely a later model housing...........guessing it's currently a plug. 

[rokinn]

It is a later model housing.  Originally for a temp sender.  You can open it up to bleed the air out of the system.  You can stick a petcock in there too for added convenience.

[Katalyzt13]

awesome, everybody, thanks!

 

Having some overheating problems, but I think it is a sneaky failure of my water pump, now.

[HOrnbrod]

What year is your truck? Like rokinn said, it's a temp sensor that feeds the ECU (if it's a 91 or above) and turns on the aux fan at ~220* or so if equipped.

[rokinn]

Yes, I was a little myopic into the Renix system with my last comment.  I put a late model housing in mine so I could bleed it easily.  That looks like the temp sensor that's in it.  If you have a 91 or 92 or HO then you need that plugged in.

[Katalyzt13]

Mine is an 87' Pioneer

[rokinn]

So, it just acts as a plug in a late model housing in your case, unless someone converted your engine to an HO.  I wouldn't jump to the conclusion that you have a defective water pump just yet.  Closed system cooling systems are difficult to bleed and will lead to overheating if not done properly.  Since you have a thermo housing set up to bleed from I recommend pulling the thermostat and replacing it with a dealer replacement which will have a little hole in it.  Orient the hole to the top side.  You can also drill 1/8th inch hole in an aftermarket one but I really recommend the dealer one in spite of the additional cost.  With a cool engine on relatively level ground you can remove the housing plug along with the reservoir cap and the system will bleed the air.  Coolant will start to come out of the hole and your system will be bled.  Replace the plug.  Fill the reservoir to the fill line.  A Volvo cap will seal better.  You can find the part # on CC somewhere with a search.  Make sure none of the O-rings are leaking as well.  This might be all you need to solve your cooling issues.  Good luck. 

[Katalyzt13]

2 hours ago, rokinn said:

So, it just acts as a plug in a late model housing in your case, unless someone converted your engine to an HO.  I wouldn't jump to the conclusion that you have a defective water pump just yet.  Closed system cooling systems are difficult to bleed and will lead to overheating if not done properly.  Since you have a thermo housing set up to bleed from I recommend pulling the thermostat and replacing it with a dealer replacement which will have a little hole in it.  Orient the hole to the top side.  You can also drill 1/8th inch hole in an aftermarket one but I really recommend the dealer one in spite of the additional cost.  With a cool engine on relatively level ground you can remove the housing plug along with the reservoir cap and the system will bleed the air.  Coolant will start to come out of the hole and your system will be bled.  Replace the plug.  Fill the reservoir to the fill line.  A Volvo cap will seal better.  You can find the part # on CC somewhere with a search.  Make sure none of the O-rings are leaking as well.  This might be all you need to solve your cooling issues.  Good luck. 

 

Thanks!  I'll try that!

[deziped]

While your there it might be wise to replace that over used, soon to explode, upper radiator hose. Mine blow out when they  bulgelike that , and usually when far out in the boonies. LOL

Edited April 24, 2018 by deziped