Wrapper

I just had the coolant replaced on my 2003 Matrix (33k miles) and I noticed
that when I drive my car the heater air is lukewarm for about 3-5 minutes
and then abruptly it gets hot. I'm not 100% positive but I think before I
had the coolant replaced, the heater air didn't take *that long* to get hot.
If this is true, I'm guessing that somehow the thermostat is taking longer
to open up. How could changing the coolant have affected this? Could the
mechanic have screwed up something? (I went to an independent garage).

Thanks.

-john
(remove the pachyderm)