Did you drill by the passenger side to put mud guard? I did drill into the vacuum reservoir, and it went into default blowing cold air up the windshield check vacuum lines first.
Heater blowing cold air,indicates towards low or no coolant or the coolant flow is getting obstructed or the heater core is clogged or hot to cold moving flap/ door is stuck in cold mode. There are many possibilities, that needs to be checked. Click the link below for step by step details:--- http://technoanswers.blogspot.com/2011/10/heater-blows-only-cold-air.html ---------- This should help.Thanks.Helpmech.
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related problem: bought a used 97 4banger jeep. I drained radiator and only got half the fluid. Like any rational human being I jumped up-down on front bumper, which dislodged sludge and rest of water from engine and/or radiator. I flushed system twice, then noticed temp gauge registered low, due to a low temp thermostat installed (to correct high heat problem is seems). I replaced with factory spec thermostat (that computer's programmed to react to) and everything is fine.
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