96 No Heat.... Bad Thermostat? replaced heater core & water valve control info inside

[eazycj]

Well after replacing the heater core. There is still no heat. I bypass the heater control valve too. By the dash gauge on the car it warms up fine(about halfway on gauge). I thought if the thermostat was bad it would be either stuck open or closed. Which would cause overheating or car wouldnt heat up at all. I know there is coolant getting to the heater core because it was leaking at first where the copper pipes came together at the heater core.


Well after some research I was told it was a blend door. Only problem this an Avalon and there isnt one. Well after reading I dont think this car has a blend door. It has a knob/electronic controls like a lexus to change the settings from hot and cold called an air mixture damper control only. There is no knobs sliders just buttons and a auto setting like a thermostat with a temperature dial So I dont know what else it can be. I took the water valve(heater control valve) out and bypassed it too. Still no heat


Also what do u have to do make the heater core stop leaking? It has brass pipes that come through the firewall then connect to the heat core but are two pieces (not soldered the heater core) >the only thing that seals it are two rubber o rings and kinda like c clips that go over the two connections but it still drips.

[carsrus]

Theres probably a place behind the dash where the temp selector motor pulls a wire to adjust a door into a blend chamber.

Remove radio and then climate control and you should see it. Removing the glove box should help as well.

[JohnGD]

Did you use new o-rings when you install the heater core? If so maybe change out the two pipes (probably electrolysis corrosion?).

Do the two heater pipes become about equally hot (this tells you hot coolant is entering and exiting the core). Or if you touch the heater core and it's hot then you know it is some thing in the console housing.