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overheating

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    #1

    overheating

    so my car has been overheating for a while now. i tried all sorts of things. i bled the system many times, check the coolant levels, made sure the thermostat was installed correctly and heat it up to make sure it opens, etc. however, when my engine warms up, pressure builds up in the lower radiator hose. the lower hose remains fairly cold, but the upper one gets really hot. when the car is all warmed up and i drive it around a bit, usually the pressure becomes so great that the radiator cap begins to leak.

    what i want to know is what else could i look into to find the solution. if worse comes to worse, i may just pull the engine and start from the inside.
    possible water pump failure? i am open to all suggestions.
    Last edited by ja23merz; 04-24-2008, 05:14 AM.
    Tags: None
    #2
    have you tried a new radiator cap?

    If that's bad, then it is not opening up to draw extra coolant from your over flow resevoir.

    Or is your over flow resevoir empty?

    ^^click it or ticket^^

    Comment

      #3
      i tried 2 brand new caps. seems to me that the coolant overflows the reservoir tank.
      what i really want to know is what could be causing the pressure in the lower radiator hose to be so great. i tested the thermostat by boiling it in a pot, but it seems like its not opening up when its in the thermostat housing.

      Comment

        #4
        i suggest u swap the thermostat.

        Comment

          #5
          but i know my thermostat is working because i tested it already. and plus, i just bought this thermostat

          Comment

            #6
            it might opens too late or too earily. It has to open exactly when it has to.
            Did you check your liquid level? maybe it's time to change it.
            Excuse my language.

            Comment

              #7
              how bout you water pump

              have you recently installed a water pump, sounds like my car when it went bad.
              Mr. $3 Dollahz Himself!

              Comment

                #8
                where did you buy your thermostat from? if you got it from an autoparts store you might have gotten the high heat temp thermo.

                Comment

                  #9
                  1) Did you measure the temp the Tstat opened when boiled? Water boils at 212 deg F, that is higher than the 170-180 deg F your tstat will open it, so you need to verify when it opens within this range and if it that is normal.

                  2) I would also verify your water pump vane is turning and that it has not become loose and does not turn under load. My mechanic friend said he's seen this happen on other cars, but it could happen on these, perhaps.

                  3) There is the potential that something bad is going on in your motor. How does the oil look? Is it dark, smell burnt, burns through oil quickly?
                  HondaFan81 For Sale Parts (LOW PRICES ON EVERYTHING)

                  Comment

                    #10
                    hmmm, thanks for all the suggestions
                    i will have to check these when i go home.
                    i'm currently at school so on the weekend ill be able to check it

                    Comment

                      #11
                      Originally posted by HondaFan81
                      1) Did you measure the temp the Tstat opened when boiled? Water boils at 212 deg F, that is higher than the 170-180 deg F your tstat will open it, so you need to verify when it opens within this range and if it that is normal.

                      2) I would also verify your water pump vane is turning and that it has not become loose and does not turn under load. My mechanic friend said he's seen this happen on other cars, but it could happen on these, perhaps.

                      3) There is the potential that something bad is going on in your motor. How does the oil look? Is it dark, smell burnt, burns through oil quickly?
                      happened to my 90 cb

                      Comment

                        #12
                        it the thermostat an oem honda one or aftermarket crap stant one. i had a similar problem with an aftermarket one cuz it wasnt opening like yours preventing my fans from coming on then the car almost overheated.


                        So get a new honda thermostat from the dealer its only 20 bucks!

                        Comment

                          #13
                          mines just leakin i only have 85K on it.. any ideas? for only 85k on the engine? antifreeze everywhere on the ground

                          1990 Accord EX 91200 miles..SOLD 2700$
                          out of the game for now but looking

                          Comment

                            #14
                            Originally posted by 1990AccordBoy
                            mines just leakin i only have 85K on it.. any ideas? for only 85k on the engine? antifreeze everywhere on the ground
                            check the hoses and radiator for holes, water pump and waterneck for bad seals. if you don't see anything, fill it up and start it and look for steam under pressure

                            Comment

                              #15
                              Originally posted by xfactortype1
                              it the thermostat an oem honda one or aftermarket crap stant one. i had a similar problem with an aftermarket one cuz it wasnt opening like yours preventing my fans from coming on then the car almost overheated.


                              So get a new honda thermostat from the dealer its only 20 bucks!
                              x2, with the thermostat not opening you shouldn't any pressure in the lower hose at all. i went through it with my f22 not long before my h22 swap. my upper radiator hose actually started to bulge from excessive pressure. if you've driven it for more than a week like that, i would go ahead and replace the upper hose as a precaution.

                              Comment

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