Heater not blowing hot air on 1997 Dodge Ram 1500

The heater on my 1997 Dodge Ram is not blowing hot air. It takes a long time to warm up in our Michigan winters and never gets very hot. Not sure if it's the thermostat and maybe needs a radiator flush. Any suggestions? Thanks.

Asked by for the 1997 Dodge Ram 1500
the hot cold selecter cable could be broken'
3 answers 2 comments
THANK YOU FOR YOUR RESPONSE. IT DOES BLOW COOL AIR, BUT IT DOESN'T GET VERY COLD. ALSO, THE HEATER DOESN'T GET VERY WARM EITHER. I HAD THE RADIATOR FLUSHED, BUT IT DIDN'T MAKE A DIFFERENCE. I'LL REPLACE THE THERMOSTAT TO SEE IF THAT HELPS. THANKS AGAIN. JACK
It sounds like your thermostat may be stuck open. A plugged radiator would make the engine run hotter not cooler.
i have a 1996 dodge ram 1500 4 wheel drive i had to replace the heater core because it was stopped up.
My 96 Dodge Ram 2500 will get up to its full operating temperature and still blows out cold air. Do you think its the heater core that went bad or got plugged up? It will heat up if I run it at higher rpms or driving it, but not while its idling.