Why does my engine stall when I turn on the heat?

SOURCE: Problems with stalling and high idle

I had problems with the idle and with the car stalling and found that it was a failed oxygen sensor. I replaced it and the car runs great now.

Marvin

• 85242 Answers
• Posted on Jun 16, 2009

SOURCE: 2004 Envoy xl stalls when making turns

this is caused by slow engine idle speed, do the procedure below.
Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

SOURCE: 1995 safari van w stalls when giving it gas.

maybe your iac valve is not working? it takes place of a choke or temp sender to computer could be bad which controls t I.A.C. known as the idle control valve,do you have any codes?

SOURCE: My car stalls or turns off when I come to a stop?

come to my shop. sound more like a torque converter lock-up problem. i dont know the specifics on the issue its having but from what you said it the first thought i had

SOURCE: Idles good untill the ac is turned on, then engine

Your throttle body is dirty and needs to be cleaned....Buy a can of throttle body cleaner.
Now you have 2 options....you can either do a remove and replace cleaning- or you can do a semi clean.,,,simi meaning leave the TB on- but spray the cleaner in- and move the plate back and forth to dislodge the accumulated crud. either way- is your choice....
But when you clean it- disconnect the battery for at least 30 min... so that it loses any bad learned settings...good luck, i hope this helps.