Hi Guys, I have a 1995 and 1997 Maxima. On my 1995 there is a old school cable driven heater valve on the the firewall. My 1997 does not have this. My heater is constantly on regardless of moving the lever from cold to hot. The a/c works but not cold air because of this. I checked the fuses and all look good. For a temporary fix I removed the cable from the clip on the heater valve on the firewall and moved the valve lever manually and now I have ice cold air conditioning.. I have ordered a spare switch that I will plug in to rule out a bad climate control switch. I followed the cable into the car and see where it goes into the blend door computer area near the gas pedal. If I pull that harness off there does anyone know what color wire I should have power at when moving from "cold to hot" on the switch? Thanks in advance. Nel

 

The only time I ever heard of this was from a guy in South Africa. Over there Nissan sold the 3rd gen as a 1995 model and didn't change to the 4th gen until the 1996 model. Are your two cars the same body style?

 

The guy above you already made that clear. Stop bumping old threads with your nonsense.

 

[QUOTE=walidd;9230134]Over there Nissan sold the 3rd gen as a 1995 model and didn't change to the 4th gen until the 1996 model.
/QUOTE]

looks like some kind of spam bot. Hopefully nobody clicked any of the links. Either way,

 

Hi Guys, it is definately a 4th gen lol. I know it's crazy and I have only seen one other with this cable driven heater valve. I' have to still install the climate control to see if it fixes the problem. So now the ac does not get cold. Thought the valve had moved to the open position but no,it is still how I left it. The compressor kicks on...suction line gets ice cold but no cold air. Going to make sure the ac line is draining next.. I assume if the drain line gets clogged it wouldn't blow cold air? Thanks guys

 

Are you sure the wire (Cable) to the blend door hasn't kinked or the blend door has issues between the hot and cold sides in that Heater/AC box?

26 years was a long run, but that's where I'd look for the breakdown.

 

Hi. Thank you for the reply. The cable looks good from what I can see. I thought about the blend door but then thought if this Maxima has a heater valve woud it have a blend door? They removed these valves in later cars than my 4/94 build and they are using a blend door. So I'm confused with this.

 

I am unaware of any heater control valve in any 4th gen Maxima.

3rd Gen yes and that ended with the 94s. If you had a heater control valve, they are usually inline between the engine and firewall and the control cable or vacuum line from the dash can open and close it. All you have is two hoses to and from the engine.

The only place any breakdown that you described can occur is in that Heater/AC box and somehow the blend door is most likely the culprit, like the hinge or seals around the door jams. Or some point in the linkage. The only other suspect, which I doubt, would be vacuum advancement for the box, so you can check all vacuum lines.

 

Thank you for the reply. Where is the lever for this flap...on pass side or driver side. I laid with my head next to the gas pedal and looked at the box. I pressed all the functions on the controller like defrost.floor level etc and I could see all that moving by the driver side. When I slide the lever from Cold to Hot nothing happens. So I'm going to change the controller first to see if it is bad.

 

USUALLY..... This is the part that goes. (This is what is in your 95): https://www.nissanpartsdeal.com/part...732-40u00.html

If it is what's wrong, do a google search on the nissan part number to find a vendor with the lowest shipped price.

 

Hello, Thanks again for all the help. Now I know what I should be looking for. If it is manageable I will do it. If not I guess I could disconnect the heater hoses from the firewall and loop them so the flow of coolant goes back to the engine. I imagine this would stop the hot air getting in there. I am in Florida after all lol Thanks again

 

The part is on the bottom of the heater box and above the ECU, which needs to be removed along with the bracket. Then the rest is easy.

DennisMik and The Wizard have done this and can hopefully share first hand experience details on getting the ECU out of the way.

All I know is Heat and Cooling make driving in all kinds of weather much more reasonable. Heat and Defrost being the most important.

 

Thank you for the reply. I'm going to give this a shot. Yes hopefully I can fix it the right way so I can keep the heating and cooling like factory. Thanks again for the reply.