2000 deville overheats but stays at normal temp with heat on full blast. changed thermostat, water pump, tried to flush radiat

[lamont 31]

2000 deville overheats but returns to normal when heat is on full blast

 

[aldan]

sounds like a clogged radiator.you can have it flow tested to find out,but it would be my guess.

 

[smorizio]

pressue test the system..your head gasket may have failed from age and your not getting the flow.

 

[mymutter]

is this at idle, or when you are moving?