Is the coolant even at the correct level?
I once owned a Saturn that a had a heater that quit working if the fluid was down even a quarter inch from "Maximum!" In that state, if you stopped on an incline, nose uphill, you'd get all the heat you wanted.
"LittleCar" : OH via NJ via VA : 3rd Owner : Silverstone 2002 MT : Nearing 150k miles
: No leaks : No Grind : No Mods (well.. ok... added cruise, window tint, new speakers, and clutch switch)
: New Battery (mfg ?) @ 125k + 2 years of sitting : 64.8 lifetime (resets ?)
I'd own a Karmann Ghia, but prefer to not freeze in the winter!