Istalled new heater core . now interior lites don't work & all 4 windows don't work

SOURCE: Leaking heater core

Yup, I've done the same thing before. You have to just find a tube of some sort that is small enough to fit inside the hose's going to and from the heater core. Remove both hoses from the heater core, insert the tube into the hoses and put some clamps on both sides nice and tight! Good luck

SOURCE: changed the heater core in 2002 ford ranger, now

Why did you buy a switch? Did the original one meter out bad? Never replace any part till you understand how it works and how to test it. Work the wipers and the lighting issues as two separate problems. The wiper motor or relay etc may have failed around the same time as the heater core. Two separate things Unplug the wiper motor and turn the key on. Meter out the connector in different switch modes. Need a schematic of the circuit. Lights-- Problem is after the fuses and they are the start of most circuits. so you know you have an open circuit like a connector under the dash you disturbed unknowingly during the heat core deal or a loose ground wire.

SOURCE: heater core leaks and interior windows steam up

got to replace heater core first try a cheap method buy some aluminum seal or bars leak put in radiator might fix problem for a short while need to replace heater core or possible hose leaking.

SOURCE: 03 f250 4x4 5.4ltr. power windows, power locks and power mirrors don't work and door ajar lite stays on

For all types of power window problem and power windows not working,i suggest you to go through the help links given below.Click the link to go through its procedure to troubleshoot the problem :------

Door ajar light stays on? http://technoanswers.blogspot.com/2012/01/door-ajar-light-stays-on.html

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power locks, power window and power mirror not working?
http://howtobyme.blogspot.com/2011/09/power-locks-power-window-and-power.html
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All power windows not working?
http://howtobyme.blogspot.com/2011/09/all-power-windows-not-working-on-2003.html

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driver side power window problem?
http://technoanswers.blogspot.com/2011/06/driver-side-window-problem-on-mercury.html

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Driver side power window wont go up?
http://howtobyme.blogspot.com/2011/10/driver-side-power-window-wont-go-up-on.html

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Power window problem
http://repairhelpcenter.blogspot.com/2012/01/pontiac-grand-am-power-window-not.html
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rear door or window will not open ?
http://technoanswers.blogspot.com/2011/06/rear-door-or-window-will-not-open-on.html
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How to remove door panel, door window motor and regulator ?
http://technoanswers.blogspot.com/2011/05/how-to-remove-door-panel-door-window.html

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Power windows not working after car wash?

http://howtobyme.blogspot.com/2011/11/power-windows-not-working-after-car.html
---------power locks, power window and power mirror not working?
http://howtobyme.blogspot.com/2011/09/power-locks-power-window-and-power.html

All power windows not working?
http://howtobyme.blogspot.com/2011/09/all-power-windows-not-working-on-2003.html
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How to remove window motor and regulator on Car?
http://howtobyme.blogspot.com/2011/09/how-to-remove-window-motor-and.html
-------------Complete Diagnosis & Testing Power Windows?

http://repairhelpcenter.blogspot.in/2012/02/diagnosis-testing-power-windows.html

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How to replace power window motor in car?
http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-power-window-motor-in.html
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HOW TO REPLACE A POWER WINDOW SWITCH
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-power-window-switch.html
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How to Replace a Window Motor
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-window-motor.html
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HOW TO REPLACE A WINDOW REGULATOR WITH MOTOR
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-window-regulator-with.html
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HOW TO REPLACE WINDOW RUN CHANNEL SEALS
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-window-run-channel-seals.html
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HOW TO REPLACE A WINDOW REGULATOR
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-window-regulator.html

-----------This will help.Thanks.

SOURCE: Fuse For Power Windows Keeps Blowing

fist disconect all windows switchs install a new fuse and reconect the swichs one by one when the fuse bloout unplug that swich and check the others switch because maybe is one or more swichs bad.or you have a short most comun areas are on door hinges or one of the windows motor is burn out