Slow Heater

[BiXLL]

I posted this in another area, but since realized it should be here. Sorry if my double post offends anyone, just trying to get my car fixed.

I have a 93 240sx vert. While I eventually get good heat, it takes a good 15 to 20 min AFTER the temp gage shows it is warm. I have changed the thermostat, took hoses off heater core at firewall and blew compressed air through to check for restrictions. After putting the hoses back on to the heater core, I started car and noticed the top hose got very warm, while the bottom hose did not change at all temp wise. This is making me wonder if perhaps since instead of having a cable/valve temp control for the water going to heater core, we have it controlled electronicly, if my climate control switch could be bad not allowing the valve to open fully to the heater core? What do you guys think?

[Hijacker]

I'm thinking it's the climate control from the sounds of it. They're pretty cheap at least

[BiXLL]

anybody know whre exactly that temp control valve is located? Perhaps I could manually check and see if it is opening all the way?