2007 Yaris sedan screams and lags when accelerating with heat on

[TNMONKEY]

2007 Yaris screams and lags and check engine light comes when accelerating with heat on does not do this when the heat is off. No idea what would cause this

[komichal]

Well if the Check Engine light is ON then I would definitely start with finding out the code. Get yourself a BT dongle worth 5 USD and read it or I believe many shops will do that for you for free.