The passenger lowbeam on my 1999 gmc envoy blew last week, but when I turn on the lowbeams, that light flickers. does this mean there's a short to that headlight and not that I have to spend $1300.00 + to get it fixed?

switch or wiring problm. Cud b a module tu. Seek a electric specialist or privatemech

check for the correct bulb in the light and problems at the base of the bulb connection

replace the low beam lights

Check relay #46 in the underhood fuse panel, check for corroded contacts first, if clean, replace relay.

Are your "brights" working. If so, change relay #46 with relay #45. If your lowbeams work again, get a new relay.

check the bulbs and if ok then check for a feed from the switch on the steering column as this is the most common fault

{: ) For the lowbeam headlamps, check these fuses at the underhood fuseblock:
LO HEADLAMP LT 10amp
LO HEADLAMP RT 10amp
HDM 15amp (main power for the HDM relay. Important)
Voltage is always present at the HDM fuse. When you switch on lowbeams, voltage should be present on the LT and RT fuses. Otherwise check the HDM relay or swap it with another known good and similar relay.
Check the two fuses again for votage:
If voltage is now present, proceed with wiring checks, checking for open wiring going to the bulbs.
If voltage is still not present on the two left and right fuses, but the HDM fuse and relay voltages are okay, you may be having a bad fuseblock.

sounds like the switch is bad

Well you need to take or loosen up the front bumper and grille. tkae out retainers up top and then bolts at fender edges and at the bottom of bumper if you need more go to collisionrepairadvice.com

test the headlight switch, that is most common cause on escorts of no headlights.