Heater only works every so often

Sounds like the heater matrix is blocked hence you have a little heat until you turn the blower on whereby it comes out cold because there's no more. Get someone to check the temp of the heater hoses when running and check for an airlock in the heater. These can be tricky to clear. Make sure the coolant is full at all times.

your a/c will make a clicking noise every time it comes on or goes off. if your heater fan doesnt come on, check your fuses, then your cnnections.

Have you replace the heater blower motor? It sounds like it is shorted.

make sure you coolant level is topped up.this happened to me once.it was just low coolant not allowing enough to circulate thru the heater

sounds like the blend door motor on the heater box is broken

Sound like a vacumm leak at one of the baffle door controlers. Look at heater box when makeing noise, should be able to see which controler is going in and out. Once you isolate which is the culprit check the hose circuit for that door.

take out the blower motor
if the bearing is ok

use a vacuum cleaner to suck out the debris in the piping

Sounds like something is drawing too much current for the resistor. Maybe blower motor going bad....

hi there
it sounds to me that you have two problems the
loud noise is the heater motor bushings is worn out causing the loud noise and vibration
also you will have to replace the resistor

once the motor is replace and the resistor replace all should be ok
don

it sounds like the themostat has stuck open. i would change the themostat and also make sure that there is no debri caught in the grill . make sure the plow is not blocking air flow