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  1. Ok folks, here's one I have a 1991 Lexus 400. And I have a problem with the heater. When I try to heat the cabin with the a/c either in auto or manual mode, and even if I keep pushing the temperature up to the maximum temperature I basically get no heat in my car. It does not mater where I have the air set to come out of. For example defrost setting blowing towards the windows. The heater setting blowd it down towards the floor. Also doesn't matter if the AC is on or not, for example in the defrost mode. The reason I say I get almost no heat is I have noticed that if I keep my driving speed up over 65 miles an hour I will get heat. But not as intense as I used to. Now driving at 65 miles an hour, I Drive in the normal mode With overdrive on should my rpms are probably a little over 2,500 or somewhere in there. Could be as high as 3000 but I haven't really made note of it. Also if it matters when I push the control to raise temperatures up or down it does respond with the beep beep beep. I have checked the heater valve in the engine compartment. When the heat is off the valve is in the closed position. When I turn the heater on the valve moves to the open position. So I'm sure the valve is opening. So what am I looking for? Information on what it could be and how to go about checking it. I don't know if it's an issue with my climate control unit. Or the heater volve... or what... Nor how to check anything else As always I thank all of you guys for your kind help!