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VW t4 multivan 1.9 tdi 1994 venting of the cooling system

paulina18t 10920 11
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16223474
    paulina18t
    Level 8  
    Hello, I have a problem with venting the cooling system. I was replacing the heater because I had no heating in the car, the hoses are cold as if there was no pressure in them. I tried to bleed the car but nothing happened. I don't know what I'm doing wrong, please help because I have no idea. I would add that I did a major overhaul of the engine and replaced all parts.
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  • #2 16223721
    tomrom1985
    Level 30  
    Describe how you vented. I am interested in whether the expansion tank is screwed or unscrewed. In addition, did you unscrew the breathers when pouring the liquid.
  • #3 16223810
    paulina18t
    Level 8  
    vented and on the screwed and unscrewed expansion tank. in my car there are no air vents only through the cap in the expansion tank.
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  • #4 16223868
    bula17
    Level 22  
    You probably have a clogged overflow line this small to the expansion tank check its care.
  • #5 16223909
    paulina18t
    Level 8  
    there is a transfer to the expansion tank at high speed and there is no transfer at idle.
  • #6 16223965
    bula17
    Level 22  
    In this situation, remove one hose from the heater, but do not completely fill the tank with liquid, turn on the fire and wait until it begins to flow out fluid when it begins to spray strongly with fluid we put on a hose and it should run.
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  • #7 16223985
    paulina18t
    Level 8  
    unfortunately it didn't help anymore :|
  • #8 16224012
    bula17
    Level 22  
    Old t4 had a shut-off valve to the heater. If you have one, check it out. After refurbishing the engine was ok? Because maybe the guilty one wasn't on the heater side. Behavior as if the water pump didn't do the job.
  • #9 16224027
    paulina18t
    Level 8  
    I checked the valve is open. after the engine renovation it was ok or could it be the fault of the water pump? Because I have no idea.
  • #10 16224032
    bula17
    Level 22  
    Dismantle the thermostat and there is access to the impeller, then screw it with a screwdriver to turn it around so you have a simple matter.
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  • #11 16224034
    paulina18t
    Level 8  
    Approx. I will check it in a moment.
  • #12 16229232
    paulina18t
    Level 8  
    I checked the water pump was working and the hoses were not clogged. the only thing is that there is circulation at high speed and there is still no low speed. the dog's return like crazy
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Topic summary

The discussion revolves around issues with venting the cooling system in a 1994 VW T4 Multivan 1.9 TDI after a heater replacement. The user reports cold hoses and a lack of pressure, despite attempts to bleed the system. Responses suggest checking the expansion tank's venting method, inspecting for a clogged overflow line, and ensuring the heater shut-off valve is operational. Further troubleshooting includes removing a hose from the heater to facilitate fluid flow and checking the water pump and thermostat for proper function. The user confirms that circulation occurs at high speeds but not at idle, indicating potential issues with the water pump or system blockage.
Summary generated by the language model.
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