I tried flushing my core a few weeks ago to get better heat in my 88, but come to find out there is no gunk or anything coming out of my heater core when i flushed and backflushed, so it was clear of debris the whole time. I am still getting little heat, and the engine is at operating temp, but the heat is not as hot as it should be, and takes a good 20 mins on HI at operating temp to get the xj warm. I was searching on how to check the blend door, but nobody went into detail. I may also add that the slider for the temp control doesnt go all the way to heat, but it is pretty close. So is this a blend door problem, and how would i go about making sure it is functioning properly? Thank You.