Originally Posted by bart0537
The front & rear are seperate systems so you need to look at what is common to both. On the front it won't be the heater core or blend door as they don't affect the rear. I doubt it's the front heater core or blend door affecting the front. Check the carpeting on the passenger side just below the dash. Usually if it's the core it will be leaking and the carpet will be wet. To replace the heater core or blend door is a major undertaking and a big pain in the A. With the heat on look under the hood and locate the hoses going into the heater core, feel them one should be hot and the other cool. The easiest way to check the blend door and core is to use a dremel and cut a hole in the plastic cover under the dash in front of the heater core. You can then feel the heater core to see if it is getting hot and can check the operation of the blend door. Save the piece you cut out so that you can epoxy it back in place. For the rear unit check the overhead controls and make sure the 2nd seat controls are turned to the hot position. The rear unit is all the way in the back on the drivers side. I suspect your problem is a clogged hose. Under the hood you will see 2 hoses going into the front heater core. Just before the core they each have a t in them to feed the rear unit the clog is most likely between the t and the radiator. Disconnect the lines from the front core and connect a hose to one and backflush the system, keep the pressure low so as not to damage the cores. When I did mine I cut the hoses right after the t and then reconnected them with copper pipe nipples and hose clamps. Good luck
Thanks for the reply. I'm starting to think no one cares/interested in helping me here.
I've been trying to figure this out the past week or so, but the weathers been really crap the past couple weeks making it harder/impossible to work on the vehicle. So anyhow, lets talk about the front first. I've been told by few forum users here & other sites, that the 2 hoses that goes in the heater core have to be both hot. So drove the car for about 30mins and checked the hoses. They were both hot meaning the coolant is circulating and heater core is okay/not clogged. I haven't check the carpet on the passenger side for leaks but I don't really smell any coolant/leak. I've also replaced the thermostat. Drove it for about 30mins again, and still the air is not as hot as it should be. I will flush the cooling system this week hoping this will solve the problem. I don't really want to start the dashboard removal until I've tried out every possibility.
AS for checking the heater core or blend door, do you mind sending me a picture as to where exactly I should dremel an opening?
I've included some pictures that I took when I checked the hoses.