I have to agree with Malcolm, The need to raise the rpm to 2k is not needed in the model year 86 or higher. doing so however will speed the process along so if your paying someone by the hour it is a good idea. What is required is to run and bleed the system for several minutes after you can feel the thermostat open. Both front hoses should be really hot. Turn both heaters on too but after the thermostat opens. The need to remove all the air is also not required but you must check your coolant level each time you drive and top it off before starting it up by removing the blue cap and adding to that tank "when cold"(the tank under pressure). Over time all air will be removed. These things work with model year 86 and higher because of the coolant ring. 85 and older is different and more care is required to get all the air out. Even a small air pocket can create major problems. This is why the coolant ring was added. gary To: vanagon@GERRY.VANAGON.COM cc: Subject: Re: Air in the system
If I may make a suggestion here: One does not have to "remove" the bleed screw to get air out of the system. One just has to loosen the bleed screw (with engine at 2,000 or 3,000 rpms) till one hears air coming out from the threads of the bleed screw. This way, after the air is expelled, there will just be a trickle of coolant and one can easily close the bleed screw without making a mess. Also I have found that if the engine is at normal working temps, there is no need to rev the engine, the 'normal' pressure in the coolant system is enough to force air up through the loosened coolant bolt threads. I do this every 500 kms after changing the coolant till I no longer get any air out of the system. Also remember to bleed the thermostat (if there is a bleed screw on top of it). Malcolm
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