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Problems with a car’s cooling system are usually indicated by a car that generates too much heat, a car that overheats or a car that runs cold all of the time. Check the thermostat and radiator if a car engine is overheating with help from an auto mechanic in this free video on car repair and diagnostics. Expert: Tom Brintzenhofe Bio: Tom Brintzenhofe has been a mechanic for the past 17 years. Filmmaker: Reel Media LLC

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24 Responses to “Auto Repair & Diagnostics : How to Diagnose a Cooling System Problem”

  1. hentaikichigai says:

    what could be the problem if the car is overheating and is getting about half of the gas economy it should be generating?

  2. ManOfMystery999 says:

    My car only overheats on high temp days and only while driving at speed over 50KMH.

    When car is idle, regardless of whether the AC is on, it wont overheat, as soon as you drive it on a hot day with AC on, the temp will rise to the redline.

    What sounds most likely to cause this?


  3. trailratedJU says:

    The most common causes of overheat on a Jeep Grand Cherokee WJ (which is the one in the video) is a bad radiator fan relay and radiator fan motor.
    Why doesn’t he mention that?

  4. six6vetteguy says:

    this is a teaser to the real video

  5. saaraisgangster says:

    I have a 98 Olds Cutlass with overheating. ASE mech has repaired leaky intake, replaced water pump, hoses, flushed radiator now recommends new radiator. whistling that accelerates as the engine is revved. I hear gurgling under the hood but sounds close to the dash when I start and stop; only little coolant lost around cap when it overheats (190 deg). I am female and sceptical of mechanics. Insight into your knowledge would be greatly appreciated. I have already spent $1200, but not fixed.

  6. paulylah says:

    He doesn’t mention it because the video, whilst starring the jeep, is not about jeeps specifically. Rather, it is a general instructional video which covers some of the basics which somebody could use to help them when trying to diagnose a cooling problem.

    Give it a rest.

  7. curtomic7 says:

    your heater core could be stopped up, preventing complete coolant flow….or your thermostat could be stuck in the closed position. if its not either of the two, you could have a damaged core in the radiator or the cap couldnt be sealing correctly.

  8. curtomic7 says:

    spot on, ive had to replace 6 fan motors and relays within the last month…..i work at a jeep outfitters in texas

  9. miketallica666 says:

    what should the normal temp be

  10. soso999999999 says:


  11. He1vis says:

    I’m surprised that he didn’t mention one of the major causes of overheating….A LEAKY HEAD GASKET. Often a very small leak in a head gasket will cause you to lose small amounts of coolant in the form of vapor. You may smell coolant after driving the car for a bit but you never see it leak. In many cases it just leaks to the outside and doesn’t show up in your oil.

  12. He1vis says:

    A leaky head gasket can also be a reason for no heat inside the car. If your heater core is hot on both hoses and your internal heating controls are working correctly, it may be a blown head gasket that keeps it from heating properly.

  13. rubylinbel says:

    I had thermostat, sensors, water pump, timing belt and other small parts replace. The head gaskets are fine. But is still heating up that he water from the resevoir tank boils up and comes out. Help

  14. rubylinbel says:

    Good advice but needs more info on other parts.

  15. albrainya says:


  16. YouEatTurds says:

    this guy sucks. probably does crystal meth

  17. Herr2Cents says:

    mitsubishi eclipse 2001 convertable is blowing cold air no heat on the inside. Thermostat was replaced. I will check those hoses. Also have a problem with mildew in car! any ideas with this model.

  18. odb060 says:

    Trying getting the radiator flushed

  19. GOLAKERS2K10 says:


  20. eminded says:

    whats a raadiator

  21. neonoxy says:

    its radiator

    its where u put the coolant
    second is the reserver

  22. SergeSaati007 says:

    Very nice video! Well explained.

  23. pitayon100 says:

    hey i have a 2003 infinity g35 and it has a over heating problem. when the car is park with engine on it those not over heat or if i use it juts in the city i wont over heat that much but wen i get in the freeway after like 2 minutes it over heats and the gage goe all the way to red what do yuo think is the problem

  24. lynnseed01 says:

    I have a 04 chevy truck that is making a ticking noes in the dash console, it all so is making a nose is coming from the heater door under the dash on the right side.
    the door is working but it seems as if it is trying turning the door past the point it can. how can i fix this problem?

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