1992 Deville No Heat

[will1976]

Hello, Just wanted some opinions on my heat problem. So far I have flushed the heatercore both ways(reattached hoses properly), flushed coolant system, changed thermostat(in its right direction), refilled radiator and reservoir to proper level. I have functioning brake release, and dont hear a vacuum leak. I had heat last winter. I guess it is the heatercore, but both hoses seem hot(the bottom one seems hotter). There is also no leak from the heatercore, and only one code E91. Thanks guys.

[gmtech1]

E91 is a PRNDL switch problem, probably not related to your heat problem. Sounds like you may have a problem with the temperature door or the controls for it.

[will1976]

sorry I left out that I have the dash apart, and see the door move when I change the heat settings.

[will1976]

was the heatercore