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The most likely cause would be that the lifters have pumped up while the engine was torn down. This is keeps the valves stuck open, thereby preventing normal compression. You will need to collapse the lifters by applying pressure on them. Normally the pressure applied by the valve springs will do it all by themselves, but at times this must be aided by applying pressure to the pushrod side of the rocker arm with a wooden hammer handle. One other cause could be if the heads were milled while off and they removed too much material. This would mean that the normal stroke of the hydraulic lifter can no longer compensate for the change. In this instance there are shorter length pushrods available, but you would need to source these through a machine shop, as they are not part of a standard engine parts catalog.
could be few thinks 1 mabe the heater core is plug, 2 bend door or actuator is broken or bad, 3 maybe thermostat is stuck close, 3 low coolant or bad water pump. Thanks
either a switch is bad or a electrical operated door failed within the duct work. . This vehicle has the abililty to set a code for this condition and only the dealer and some shops have the diagnostic equipment to diagnose this cortectly the first time.
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