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Post by Naeos_Valkarian on Jan 28, 2016 8:44:39 GMT -5
As odd as it sounds the knob that is used to control the heater valve springs back to cold when turned. I have traced the problem to where the cable connects to a control arm on the bottom of the heater core housing. I managed to open the valve a bit but as you can imagine it's not enough in the dead of winter. Am I right in assuming it's the valve that's stuck or is it something else and if so how would I go about replacing it?  |
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Post by taylorauto on Jan 28, 2016 17:56:12 GMT -5
It is most likely the Heater control valve
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Post by Naeos_Valkarian on Jan 28, 2016 19:30:59 GMT -5
It is most likely the Heater control valve Is the valve part of the heater core or can I replace it separately? |
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Post by taylorauto on Jan 29, 2016 12:15:32 GMT -5
Its Separate.
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Post by Naeos_Valkarian on Feb 5, 2016 7:06:28 GMT -5
Does anyone know the part number for the heater valve or have a link to where I can buy one? I have scoured the net and can't seem to find a part number or really any reference to it anywhere. I would go through the dealership but they have a knack for overpricing the simplest components.
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Post by ES_97Sport on Feb 5, 2016 15:23:52 GMT -5
Does anyone know the part number for the heater valve or have a link to where I can buy one? I have scoured the net and can't seem to find a part number or really any reference to it anywhere. I would go through the dealership but they have a knack for overpricing the simplest components. ninestar, are you talking about the flapper control valves in the boxes? Edward |
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Post by Naeos_Valkarian on Feb 5, 2016 16:27:19 GMT -5
Does anyone know the part number for the heater valve or have a link to where I can buy one? I have scoured the net and can't seem to find a part number or really any reference to it anywhere. I would go through the dealership but they have a knack for overpricing the simplest components. ninestar, are you talking about the flapper control valves in the boxes? Edward If you trace the thermostat control cable it terminates under the heater box, the cable pushes/pulls a lever that allows a valve inside the heater box to open/close which controls the flow of coolant through the heater core. That valve is possibly stuck in the closed position as it takes a tremendous amount of strength for me to open half way open by hand. Ofc it sounds like it could be the control mechanism too, I don't plan on taking all that apart just see what's wrong and then put it back together only to have to pull it all apart again when I get the parts. |
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Post by taylorauto on Feb 5, 2016 17:38:01 GMT -5
I believe mitsu calls it the door actuator or control valve. I can't remember.
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Post by Naeos_Valkarian on Feb 6, 2016 12:16:01 GMT -5
I believe mitsu calls it the door actuator or control valve. I can't remember. I googled these terms and still can't find anything related to the heater valve or the assembly in general, I guess I'm going to head down to the local junk yard and see if I can pull the whole heater box and just call it a day. Look on the bright side at least I'll have a spare heater core.  Oh and sorry about my earlier post seeming a little brisk, I was at work and had to ninja post it.  |
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Post by ES_97Sport on Feb 8, 2016 15:48:07 GMT -5
... If you trace the thermostat control cable it terminates under the heater box, the cable pushes/pulls a lever that allows a valve inside the heater box to open/close which controls the flow of coolant through the heater core. That valve is possibly stuck in the closed position as it takes a tremendous amount of strength for me to open half way open by hand. Ofc it sounds like it could be the control mechanism too, I don't plan on taking all that apart just see what's wrong and then put it back together only to have to pull it all apart again when I get the parts. Ok, that's what I thought. I wasn't sure if I missed something when i was going through the diagrams. So, you have the same problem I have. On mine its the directional air flow control. Probably the rubber flapper 'valve' is either getting hard or there's a bunch of accumulated crud in the box or both. That is a two piece assembly. There's an upper box that houses the heater core and a lower half that houses the fan. The lower is 'recirculating'. The upper hot/cold and the air flow direction controls - full defrost, half defrost/half floor/cab, floor, floor/cab, etc. I checked with the dealership. None of it is available from Mitsu.  Neither the entire assemblies nor the flapper valves themselves. You might get lucky and there's just crud that needs to be cleaned out but you are right that it would suck to find out you need parts and don't have them because the entire dash has to be taken out to do the top box. Edward |
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Post by Naeos_Valkarian on Feb 8, 2016 22:26:53 GMT -5
... If you trace the thermostat control cable it terminates under the heater box, the cable pushes/pulls a lever that allows a valve inside the heater box to open/close which controls the flow of coolant through the heater core. That valve is possibly stuck in the closed position as it takes a tremendous amount of strength for me to open half way open by hand. Ofc it sounds like it could be the control mechanism too, I don't plan on taking all that apart just see what's wrong and then put it back together only to have to pull it all apart again when I get the parts. Ok, that's what I thought. I wasn't sure if I missed something when i was going through the diagrams. So, you have the same problem I have. On mine its the directional air flow control. Probably the rubber flapper 'valve' is either getting hard or there's a bunch of accumulated crud in the box or both. That is a two piece assembly. There's an upper box that houses the heater core and a lower half that houses the fan. The lower is 'recirculating'. The upper hot/cold and the air flow direction controls - full defrost, half defrost/half floor/cab, floor, floor/cab, etc. I checked with the dealership. None of it is available from Mitsu. Neither the entire assemblies nor the flapper valves themselves. You might get lucky and there's just crud that needs to be cleaned out but you are right that it would suck to find out you need parts and don't have them because the entire dash has to be taken out to do the top box. Edward When I finally have some free time in the coming week(s) I will see if I can get a hold of an entire heater box and related parts from a junk yard, However I'm curious as to what years have compatible parts? Will the heater box from an 01 model fit in my 98? I doubt it but all I can seem to find around here is 01~02 models. I'd have to travel a few hours out to find parts for a 98. |
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Post by ES_97Sport on Feb 9, 2016 14:38:59 GMT -5
... When I finally have some free time in the coming week(s) I will see if I can get a hold of an entire heater box and related parts from a junk yard, However I'm curious as to what years have compatible parts? Will the heater box from an 01 model fit in my 98? I doubt it but all I can seem to find around here is 01~02 models. I'd have to travel a few hours out to find parts for a 98. I talked to the parts guy about this a few weeks ago. I asked him the same questions and he couldn't tell me anything useful. I THINK that '97-'98 are the same. The HVAC stuff started changing in '99. AFAIKT the '99 is the same as the '00 and '01 but don't quote me.  I have no idea how much if any of the '99 stuff is backwards compatible. It sounded to me and the parts guy was thinking along the same lines that '97-'98 are the only two years that are compatible with each other. Edward |
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Post by Naeos_Valkarian on Feb 9, 2016 15:50:13 GMT -5
... When I finally have some free time in the coming week(s) I will see if I can get a hold of an entire heater box and related parts from a junk yard, However I'm curious as to what years have compatible parts? Will the heater box from an 01 model fit in my 98? I doubt it but all I can seem to find around here is 01~02 models. I'd have to travel a few hours out to find parts for a 98. I talked to the parts guy about this a few weeks ago. I asked him the same questions and he couldn't tell me anything useful. I THINK that '97-'98 are the same. The HVAC stuff started changing in '99. AFAIKT the '99 is the same as the '00 and '01 but don't quote me. I have no idea how much if any of the '99 stuff is backwards compatible. It sounded to me and the parts guy was thinking along the same lines that '97-'98 are the only two years that are compatible with each other. Edward With this information it seems that I'll just have to make a road trip out of this. |
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Neither the entire assemblies nor the flapper valves themselves.
I have no idea how much if any of the '99 stuff is backwards compatible.