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  • temp question

    My jeep runs fine, the temp gauge doesnt get over 1/4-1/3 up the green, (I don't know the actual temp.)

    however, when it is very hot outside, I occasionally hear the radiator cap hissing and relieveing pressure. The overflow bottle is not full.

    I did a flush and fill when I replaced the heater core and blower last fall.

    Is this a problem or am I just being overly cautious?

  • #2
    Wow, I never hear mine, the loud water pump keeps the noise covered.
    As long as the hiss is coming from the cap and not anywhere else I wouldn't worry. Unless your cap is old and needs to be replaced.

    Comment


    • #3
      I would worry. Jeep electrical gauges are notoriously finnicky and who knows how hot your engine is really getting. I would buy a mechanical gauge and install it in your engine. Lost-one said it might be a bad radiator cap, and that's true. But if it's something more serious and your engine is running > 220 degrees, you better fix it before you warp the heads.

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      • #4
        I put a brand new engine in and replaced my temp guage and it would run really hot on the guage, almost to the "H". I had them check it with an external thermal gun at the dealership and they said it was ranging from 185-195 (it was only in the 20-30s at the time). I replace the thermostat from a 195 to a 185 and it got slightly better, then tried a 165 and it got a little better, all the while none of the thermostats allowed for decent flow in the top hose. Finally I took the thermostat out completely and it runs cooler, about 1/3 through the gauge C-H and I have great flow in the top hose. I know some folks arent crazy about running without a thermostat, but it works well now... winter will be another story.

        Comment


        • #5
          Originally posted by WVUBlue80CJ
          I put a brand new engine in and replaced my temp guage and it would run really hot on the guage, almost to the "H". I had them check it with an external thermal gun at the dealership and they said it was ranging from 185-195 (it was only in the 20-30s at the time). I replace the thermostat from a 195 to a 185 and it got slightly better, then tried a 165 and it got a little better, all the while none of the thermostats allowed for decent flow in the top hose. Finally I took the thermostat out completely and it runs cooler, about 1/3 through the gauge C-H and I have great flow in the top hose. I know some folks arent crazy about running without a thermostat, but it works well now... winter will be another story.
          Yeah, it's gonna take a while before you're engine warms up.

          Comment


          • #6
            i'm one of them that would have gone crazy. you should at least run a restrictor plate. the water will pass through the rad too fast to cool down. you'll know your engine is too hot when it pops a vein and your nose is scalded like a polish sausage from the coolant spray.

            Comment


            • #7
              Originally posted by rmy
              Yeah, it's gonna take a while before you're engine warms up.
              Not to mention when he sits for awhile it will get cold really quick.

              Comment


              • #8
                CFTJ, dont mean to jack your post, but it sounds like you are in a similar spot, Im just a month or two down the road on it.

                Fubar- What gives though with even a 165 thermostat? why is that restricting flow so much? I checked it on the stove and it (and the other two or three higher temp ones) worked great. The installation is really idiot proof so I just dont know why my flow is so bad. PS- replaced the water pump just to make sure too...

                Comment


                • #9
                  Originally posted by WVUBlue80CJ
                  CFTJ, dont mean to jack your post, but it sounds like you are in a similar spot, Im just a month or two down the road on it.

                  Fubar- What gives though with even a 165 thermostat? why is that restricting flow so much? I checked it on the stove and it (and the other two or three higher temp ones) worked great. The installation is really idiot proof so I just dont know why my flow is so bad. PS- replaced the water pump just to make sure too...
                  How many core radiator do you have? And did you know that a new engine runs hotter than a broken in one.
                  Did you make sure that you burped the system?
                  Do you have your hoses run right?

                  Comment


                  • #10
                    Sometimes you need to drill a hole in the thermostat disc near the outer edge so that any trapped air can pass. Depending on the configuration of your tstat/housing, if there's an air bubble caught behind the thermostat it can restrict flow.

                    See this site:
                    http://www.georgenitta.com/thermo.htm

                    Their reference is to "even temperature" but you can see how the location of the hole could relieve a trapped bubble...

                    HTH

                    Comment


                    • #11
                      I did purchase a mech temp gauge this weekend, and plan to put it in, but the question is where? I replaced my oil with a mechanical gauge when I did the bottom end rebuild last year.

                      it is the 1-1/4" dia. (I think) I have a surface mounted tach in the "stock" tach location, and my switch for the garage door opener, and future OBA switch in the "stock clock" location.

                      I cant fit it above the oil/volt gauges because of the defrost duct clearance.

                      Any suggestions?

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                      • #12
                        What brand mech oil press guage did you get. Did it have a plastic housing? If so, how did you ground it?

                        I tried the AutoMeter one, but sent it back cuz I didn't want to splice the new light bulb into the existing wiring.

                        Comment


                        • #13
                          as others have mentioned there are a lot of things that can interfere with flow. calcium build up, air bubbles, etc. i saw a guy tighten a clamp down too hard once and it crushed the sleeve under it closing off some flow.

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