SLCPUD Posted December 6, 2011 Share Posted December 6, 2011 I have a 1988 EA82 DL. Heat will come out for about 15 seconds, then cool. I had this heating issue before I rebuilt the engine a few months ago. With the engine out I flushed the heater core with both air and water - both sides. Flowed easily at that time. With the engine and heater on, both under-the-hood heater core pipes are hot. The temperature slider on the dashboard works well and appears to make the blend door operate. The Defrost/Heat/Bi-Level dashboard buttons work also. Coolant is full. Fuse good. No interior coolant leaks. Summer thermostat. A/C inoperable but still need compressor in place for belts. The A/C dashboard button when pressed also blows heat for 15 seconds then cool. I am wondering if the heater core is not working properly even though it initially flushed well and currently has hot in/out pipes. Extraneous outside air coming thru ductwork? Is there other vacuum/mechanical linkages that I need to check-out? Advice. Quote Link to comment Share on other sites More sharing options...
MilesFox Posted December 6, 2011 Share Posted December 6, 2011 maybe the middle of the core is clogged, and all the hot liquid is bypassing on the outsides, but not at enough volume to stay warm if the middle is plugged. just an idea. the heater hose runs straight from the waterpump as well. Quote Link to comment Share on other sites More sharing options...
davebugs Posted December 6, 2011 Share Posted December 6, 2011 Moderators - this needs moved somewhere I'd think. Quote Link to comment Share on other sites More sharing options...
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