Home » Cooling Perfomance » What Causes The Heater In My Car To Blow Warm Air For A Few Minutes Then Only Cold What Causes The Heater In My Car To Blow Warm Air For A Few Minutes Then Only Cold This is for a 1987 Toyota Celica and a late 80s model camry. The thermostats have been replaced in both vehicles and tested. The heat will blow warm air for about 5 minutes then go to cold. Tags:Blow, Causes, Cold, Heater, Minutes, Only, Warm Related Questions Conversion Kits Do they sell fuel injection kits to convert my carburator z20 engine. 1981 Nissan datsun 510 hatchback. and where can i get them? Does A Thermostat On A Car Only Regulate Temperature Does a thermostat on a car only regulate temperature of does it have other uses? Answers for The Question kim heater cores are probably clogged. Go to a radiator shop. jmb162000 I hope I am wrong but it could be either low coolant, a bad heater core, or a bad head or head gasket. Let me at least be correct about the low coolant or heater core. But please hope I am wrong about the head gasket and or bad cylinder head!!!! E T Is the radiator full of coolant? Are both cars doing the same thing? Incoming search terms: Heater In My Car Stays On For A Few Minutes Goes Off?