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  • Overheating/Coolant loss

    I just drove my car 20 hours straight from Virginia to San Antonio and I've been having some problems. I'd look a little farther into it now, but that much driving straight is taking it's toll. I'm also now 1200 miles from all my tools. The car in question is a 95Z with 122,000 on it. Now onto the problem...

    While driving, within about 2 minutes(fast enough for it to happen between me looking down and checking my speed) the temp gauge went from about 180 or so to the red where the check gages light comes. I pulled over and popped the hood to find the coolant overflow cap blew off and it vomited coolant all over the ground(about a gallon or so). I cracked the bleeders to let the steam out, started it up and bled the system and topped it off with the bottle of coolant and water I brought with me. Started driving again and everything is acting normal again. The temp kept constant around 180 the whole time, including when I pull in to get gas every 300 miles or so(only times I stopped or even slowed the car down). Everything was normal still, but after I filled up, within minutes of getting back onto the highway the temp would shoot back up like it did before and the overflow tank would be boiling over. I'd crack the bleeders and fill it back up again(buying water and coolant at every gas stop) and it would go back to normal. This happened 3 or 4 times before I made it here to TX, and when I parked here at the house, I popped the hood to check and see if it was doing anything abnormal after I shut it off and there was a hissing sound coming from the general area of the passenger side exhaust manifold(couldn't pin point exactly where because it started to rain as soon as I opened he car door) and there was steam coming from somewhere underneath the PCM. I've got a couple weeks to fix this before I need to drive it back and I can't exactly afford to take it somewhere, especially if I can do it myself. Any ideas, input, suggestions(especially Joe and Fred )...

    Tomorrow, after the whole family meet and greet, I'm gonna head down to the parts store and get stuff so I can pressure test it.
    95 Z28 - K&N FIPK, Flowmaster cat-back, Edelbrock STB, UMI Perf SFC, Performabuilt Pro Street 4L60E, 2800 Stall, Hayden tranny cooler, CRT Intake elbow, LS1 DS, 2k C5 replicas, Toyo Proxes T1S 255/40/17(f) 285/40/18(r), slotted rotors w/ Axxis MM pads, 15% front/5% rear tint, 97+ Console upgrade, all oils now synthetic

    Bought and to install: UMI Adj LCA, Adj Panhard, LCA relocation brackets, 96 SS Spoiler....Broken and to be fixed

  • #2
    The cooling system should be sealed in order to not overheat. A hissing sound from the passenger side area leads me to believe one of the heater hoses has gone bad.

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    • #3
      Which would lead to the vomiting out the overflow? Let's hope
      95 Z28 - K&N FIPK, Flowmaster cat-back, Edelbrock STB, UMI Perf SFC, Performabuilt Pro Street 4L60E, 2800 Stall, Hayden tranny cooler, CRT Intake elbow, LS1 DS, 2k C5 replicas, Toyo Proxes T1S 255/40/17(f) 285/40/18(r), slotted rotors w/ Axxis MM pads, 15% front/5% rear tint, 97+ Console upgrade, all oils now synthetic

      Bought and to install: UMI Adj LCA, Adj Panhard, LCA relocation brackets, 96 SS Spoiler....Broken and to be fixed

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      • #4
        Originally posted by benhart21
        Which would lead to the vomiting out the overflow? Let's hope
        if the cooling system overheats, yes. Anything over 18 psi will cause the cap to vent and the coolant goes into the bottle. If the cooling system is not overheating, then you have a bad headgasket. (venting into the cooling system)

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