I have a 99 Dodge Intrepid. I had everything replaced that has to do with the heating system last year. Now my heat only works when I'm driving. I've taken it into my "car guy" and they can't seem to find anything wrong with it, but I'm still freezing when I stop at a light!
What does your thermostat say? is it reading in the cool range or in the normal running temperature range?
if its reading cool..... your thermostat needs to be replaced.
does the fan blow well? or does it only blow while moving?
if the fan doesnt blow well/ not at all, or seems to blow better when driving then its either a bad fan or/and wiring problems to the fan
some cars have vacuum activated valve that turn on and off the heater. if you have a leak in the vacuum line under your dash it could be causing the valve to only open half way. making it not work as well..
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either a heat switch is not switching heat to the compartment or else the thermostat in the cooling system is defective. when it is not open it does not let hot water to the internal heating system, has your engine been overheating or running hot? also as this would be a symtom.
Replace your overflow tank cap. This is a small problem that a lot of people overlook and end up replacing everything. What happens is the heated water and engine heat causes the seal to break down, and overtime the cap/seal can no longer hold pressure which causes the car to have a high temp or over heat. It will also cause you to lose coolant sometimes if you find yourself refilling on a regular basis. Try a new cap or have yours pressure checked at a local store. A new cap is $7-$12
This sounds like your automatic climate control is starting to malfunction. Check to make sure your coolant is full, and temp is not fluctuating, and when your vehicle is warmed up, try using the low setting and feel for air temp. Is it warmer than if you turn it up? When at idle the vehicle is not producing heat the same as if you are driving, putting load on your engine and more air/fuel combustion means more heat, which is why you can feel heat while driving. Ideally you should feel heat as soon as the engine is warming up, getting hotter as it reaches peak temp of 190-210 degrees. You can try to make sure your water control valve is not blocked, and all electrical connections are secure. This will be located close to your firewall and connected to the coolant tubes that run into your firewall to your heater-core. Also use recirc (setting)to try to summon as much heat as possible, however ultimately, you may need to take you vehicle in for service. If it only warms when driving defrost will be an issue. Good luck.