Coolant tank and a mystery tube

1998 CHEVROLET TRACKER
112,000 MILES • 1.6L • 4 CYL • AUTOMATIC
Avatar
ANJELH
  • MEMBER
  • 2 POSTS
After doing some research online and reviewing the repair manual for this car, my boyfriend determined that I need to replace the radiator cap and the coolant reservoir cap and hoses. There had been some issues with the coolant boiling in the reservoir. He disconnected the off the old reservoir cap/tubes, and I purchased new ones.
So, I have put in the new reservoir cap. One tube goes to the radiator, but is the other supposed to be left unattached to anything?

Also, I'm unsure if this is related, but there is a very thin tube that runs from the engine and splits in two directions. One is long and goes down somewhere I ant quite see, the other is short but I don't know where it goes. I have attached a picture of these tubes if that helps.

Thank you!
May 1, 2015 at 2:05 PM
Advertisement
Avatar
RACEFAN966
  • CERTIFIED EXPERT
  • 5,029 POSTS
The second hose is typically an overflow tube that allows excess coolant to escape from the reservoir in case it gets too full. This hose usually runs down the side of the reservoir and does not need to be connected to anything on the other end.
May 2, 2015 at 7:07 AM
Avatar
ANJELH
  • MEMBER
  • 2 POSTS
I saw a lot of information suggesting it may be the head gasket, so that's going to be the next thing I check. The radiator cap seal *was* damaged when I took it off - the rubber ring had a big crack inside it. I want to take it to have it checked out, but I'm nervous to run it with the tube from the engine disconnected, I don't know what it's called and I can't seem to find any information online with the limited knowledge I have.

Attached is a picture of the tube I'm referring to. I had tried to include it with my question, but I guess it didn't upload from my phone.

Thank you!
May 2, 2015 at 1:50 PM
Advertisement
Avatar
RACEFAN966
  • CERTIFIED EXPERT
  • 5,029 POSTS
That is just a vacuum tube cant see what it controls but plug it so the car won't run to bad, it won't cause an overheat.
May 4, 2015 at 7:51 AM