99 Cadillac sevelle is over heating?

crs

New member
changed the thermostat and that didnt work.. so i sent it to a shop for them to check the radiator and they said the rad is fine.. they also changed the thermostat again..

Only overheats while under a load.. and when im stoped it cools back down..
also while overheating all i get is cold air when i turn on heat.. once it starts to cool back down i get hot air again..

what could it be? please help!

Thanks in advance for the help
 
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