I have a 1999 grand marquis n My heater seem to blow heat when I'm driving but it's really not pushing heat out n I just change the blower motor

You seem to have solved your own problem, I dare say--- You could check coolant level and thermostat behavior as it relates to engine temperature~ Seem like it's easy to get to? a lot of these are conveniently bascially c-flange arrangements and only take a moment to replace. Tell me that this is one of those easy to replace models....else will be turning to u-tube with checkered results-

It could be a worn water pump that is not circulating the coolant at low engine speeds.

loogout! http://www.youtube.com/watch?v=Ja4dAjFk5Jk

I cannot contain myself from laughing at the vid that tenspeed had us watch with regard to moto mounts----hey, I've met this guy. I know ths guy. Drove a yellow cab thru the core when time was I had to- and lived Downtown Oakland for fifteen years.

Judge Roy I have already change out the blower

No I don't kno that is to b honest

it's a resistor pack, if it burns out will leave you with the condition you're describing exactly---lemme come up with an example you can take to the bank...er um autoparts store~

http://www.youtube.com/watch?v=7x9jUYyEWhk

I'm check this out in am

Where would this piece be at

look at that stupid video shows how easy, just have to feel comfortable rippin apart your dash...it's easy once you gather the courage!

rarwrawr rip and tear, bruno, rip and tear!

It is located on a flat on the plenum...yes that's what it's called, a plenum~ it's made of tough plastic.

If all of your blower fan speeds work, your resister is good.