I change my heater core and now my car won't start

Did you remove dash? Get everything re-connected? Did you drop or lower steering column? All wiring intact, harnesses connected? You may have an activated anti-theft system, is light on steady or flashing?

Yeah I dropped the steering column and I'm not sure about the light. I get home around 1. I can check that out it see if it flashing. If it's the anti-theft system how do I turn it off?

Hey thanks a lot man it was the anti-theft system.

Glad it worked out for you.

I have a 2007 torrance that has the same problem.new battery all good but when try to start dont turn over .but if wait can here fuel pump kick on car turns over like a dead battery.very slow.was told could be bad ground.any ideal.thank you

I got the same exact issue, replaced heater core, put it all back together, everything works when I turn the key on, will not turn over or anything.

I have done all the above & car still won’t start

When you turn the key do you see ANY dash lights? Recheck all the battery connections, fuses, including mega fuse, check for voltage just in case you blew a fusible link. If all that checks out then check status of anti theft system and that all wire harness connectors were reconnected.