knocking in the heater

when I starte my blazer 1992 . Its starts to tap and then a few secounds it stops
when I cut off the engine it starts agin
and then stops:banghead:

well I guess nobody know whats going on with th knocking under then dash
well can any body make a guess for me
its really worring me
it does it when it starts up and when i cut the engine off
it dont do it for long each time

well I guess nobody know whats going on with th knocking under then dash
well can any body make a guess for me
its really worring me
it does it when it starts up and when i cut the engine off
it dont do it for long each time

The only thing I could guess it would be is the blower motor? Does it make the noise with the blower turned off?

Metal sounds or water gurgling sound? This a 4.3 motor and S-10 Blazer?

Is it a really loud noise? Does your heater still work? Things wear out and start to make noise I wouldnt really worry about it too much if it still works and isnt really that loud

yes it makes just a small tapping noise when ever i start the engine and when i cut it off
it a 1992 blazer with a 5.7 in it
its a great truck and i want to keep it nice

Motor mount

[quot e=BlazerLT]Motor mount[/quote] do what ?
no its not the motor mounts

tap as in a relay going off as a click or a tapa tapa sound

yeap it does sound like a tapa tapa , ok what do i do to fix the problem ?
i was going to sell it but it has changer my mind im going to fix all the little fixes and keep it

ohh ofthe suject when do i become a reg like ya`ll newbe its sound s like recruit

The heater fan always runs at low speeds when the car is on, I would try to disconect the fan motor and see if it still does it.

thank ya`ll