Fixing my dang car.

have a 3.5 l 97 dodge intrepid put two new thermo in and still no heat cools off going down the road help

i have a 1997 chevy suburban. the daytime running lights are not working, even though the green indicator light is on. also when the high beams are turned on, the low beams turn off, so instead of all 4 lights being on, only the inner high beams are on. the low beams work fine on their own however. i have replaced the drl-module, but no change. i suspect the drl-relay, am i on the right track? also i can find no reference in any manual as to where this relay is located. the wiring diagram and owners manual show it exists. the owners manual says its in the fuse/relay block under the hood, by the master cylinder, however the only thing there is a fuse for fog lights. the drl lights did work before, and i have changed nothing under hood to cause this. they started working again for about a week, but then quit again. any ideas or input will be greatly appreciated.