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Check your flapper doors and blower/ducts for clogs or problems.
Also the cooling system thermostat could be stuck open. Auto heaters have a tiny radiator heater core that uses hot engine coolant to warm the cabin air.
That all has to be working in order to get heat.
Check the coolant level first. When the engine is cold remove the radiator cap and look to see if the radiator is full. Top off as necessary. If it is full than there is a chance that the heater core is plugged and needs the extra RPMs from the engine to push more coolant through it. Heater cores can be back flushed and this should be tried before considering replacement. Back flushing works about 90% of the time.
If it does work I would recommend flushing the cooling system. Dirty coolant can cause the heater cores to plug up and you don't get a second chance if the heater core plugs up again, typically.
put in a radiator flush ,run it for 20 miles it can be a blocked core in both the radiator and the heater.that should clean it. then refill with a 50/50 mix anti freeze then bleed it of air. put your heater on full .run the engine on tick over.then push in the radiator hose to push the air out of the expansion bottle cap .it is off . then refit your cap.
Get the radiator and heater core, hoses and thermostat replaced. Also replace the mixing valve if needed. A radiator shop could give you an estimate and diagnose the problem better than I can online. I hope sincerly that this helps.
I would change the Thermostat. if that doesn't fix it? I would buy a Radiator flush and follow the directions exactly you will be surprised how much junk comes out. That should fix all your heat problems.
2006 pontiac montana
I suggest you try one of those instant download manuals. My nephew bought one for me when my car broke and we could fix it all by ourselves with the manual costing $10. This website reliable-store.com is very good for this.
?Try it.
First off make sure the thermostat settings are set the same on the control panel for both front and rear units if thats ok it could b a few possibilities. 1 pluged heater core in rear 2 blocked heater hose try looking into these and see if it helps any
a heater uses the temperature of the cars water, running threw a heat exchanger if the heater core has failed water will not circulate threw the engine properly this will and can cause over heating as well as nothing blowing from the heater. good luck.heater cores are generally inexpensive parts to replace.
last thing you can check if heater core is ok. is the thermostat.
There is a flap in the venting itself that can get stuck. Or the actuator that moves it can become faulty. It is located above heater core and it's housing. You will have to remove bottom console to access it.
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