Whirlpool model LGR4634JQ0 Began not heating today. I've checked the timer and have run thru the different cycles. What would you recommend checking to find exact failure of heating.

Pop off the cover on the bottom left side of the front panel,look inside with the dryer running,does the ignitor glow?if not unplug it,pull out the filter on top,remove the two phillips screws in front of the filter on top panel,get a screw driver and pop up the top panel,on the sides remove the two 5/16 inch screws,unplug the door switch and lift the front panel off.unplug the ignitor and check it with your meter,if it's good check the sensor to the left of it.if it does glow it will be bad gas coils or the gas valve but most of the time it's the coils,also you can tell if the coils are bad is they will work normally until they heat up and then the fail,so you'll have heat for the first 15 to 30 minutes and then nothing.if all checks good you could have a bad timer or motor but usually it's not that.while you have it apart you should clean it out.with a shop vac vac up all the lint in the cabinet,stick the vac on blow and blow all the lint off the motor and blow off all the gas parts,then go in the back,remove the vent line and the back panel,if the vent line is long blow it out with a leaf blower and go outside and make sure the outside duct is clear.then remove the duct that the lint filter slides into and clean that out.if you do this once a year your dryer will last a long time,your clothes will dry on time and you don't have to worry about a dryer fire.if you need any more help let me know,if you let me know what part you found that was bad i can look it up for you and give you the part number and a price.good luck