David Marshall wrote: > I thought that switching to the Audi engine would get rid of my coolant > problems in my Double Cab. I am finding that it is over heating after I > turn it off. I can drive for hours and the coolant needle stays at or > slightly below the red "idiot" light on the coolant gauge - basically the > same place it always is [ or slightly lower than what the wasserboxer was ] > . But two minutes after I turn it off there is massive bubbling sound of > water boiling in the round expansion tank. The first few times it did this > it spewed some [ 100ml ] coolant on the ground [ from the square top-up > tank ]. When the engine is cold the coolant levels are all where they are > supposed to be. I noticed that my radiator fan never came on in the last > little while [ month perhaps ] so I checked the plug to the rad. Pin 1 had > 12V and when Pin 1 was bridged to pin 2 or 3 the radiator fan did come on. > So, I installed a new thermostat switch with a 85 / 95C "turn on" points [ > the old one was a hotter rating ] figuring that there was no more air > moving over the radiator when the truck was stationary and the heat from > the rad was leaching into the engine and over heating the system due to the > fan not coming on. When I replaced the switch I noticed a soft grayish > green film on the old switch. Needless to say my truck is still over > heating when I park it and the radiator fan does not come on [ the radiator > feels only warm to the touch ]. The bubbling lasts for about 30 seconds or > so. The out side temp is less than 10C. And sufficient heat comes from > the heater. Is it the green film making an insulating layer in the cooling > system preventing it from dissipating heat? Is it my water pump packing it > in? > > Please help! > > -- David Marshall, Quesnel BC, mailto:david@volkswagen.org -- > -- 78 1.8L VW Rabbit, 80 2.0L VW Caddy, 87 Audi 5KQ -- > -- 85 1.8L VW Cabrio, 88 2.0L VW Syncro Double Cab -- > -- Volkswagen Homepage http://www.volkswagen.org -- > -- USE DAVID@VOLKSWAGEN.ORG WHEN SENDING PMAIL -- Been going through something similar ... First, make sure your rad. isn't clogged (take it out and get it blasted and/or de-scaled at a radiator shop). If blasting doesn't help, you can get a new one for $240. Next make sure you've bled the system correctly. And lastly, try a lower temp thermostat (80C). The fan doesn't come on because there's not enough hot water is circulating through the rad. (again, there's probably blockage somewhere, or too much air in the system). Dick |
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