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About Skip Bollinger
Expertise
Heretofore, I will NOT answer any mechanical question. I am not qualified and can only offer speculations. You are better served by others that are true Techs. With that being said, please only ask about parts and locating obsolete Auto Parts. Thank you. I have the ability to locate quite a few mechanical parts for American made vehicles fron the 1900`s to present. Some are OEM and some are aftermarket. This would include engine, brake and chassis parts. Body parts and trim are VERY difficult to find but you may inquire. If you need assistance in repair, I have illustrated books for major American manufacturers that show some illustrations BEFORE 1974. If needed, I can supply repair manuals for your specific vehicle. PLEASE REMEBER I'M A PARTS SPECIALIST, NOT A TECH!! Thank you.. Skip

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Too many to list but they run from Europe through America and to Australia.

 
   

You are here:  Experts > Industry > Transportation and Logistics > Automotive > Low heat on Heater output

Automotive - Low heat on Heater output


Expert: Skip Bollinger - 1/16/2008

Question
My 1991 300zx is not producing much heat through the vents (i.e. 50 degrees). This is a digital climate control. The temperature is normal, the thermostat is good, no antifreeze leaks (i.e. heater core). All other functions are good.  Would the heater control valve cause this? Where is that located?

Answer
Tim,
  This is a repair question, NOT a parts question, Okay? I will offer you my thoughts but can't bother my customers (REAL TECHS) with this. I was beginning to "bother" them. I'm not supposed to use the phrase "Pi** them off". Please understand.. Okay, here is what I want you to do:
  If it has climate control, I don't know if it has a heater valve. I just looked in Murray (A/C & Heater parts manufacturer) and it didn't even list a heater valve for your car. It COULD be it is a dealer item only. If you follow the heater hoses, you should find the valve if it is on the vehicle. You will follow them to the heater core. Usually two hoses in juxtaposition going into the firewall. Feel both of them. They should feel the same temperature. If one is Hot and the other is Cool, then the heater core is plugging up. It is not letting the water pass through quickly enough to supply adequate heat. The water is just trickling through and the fan blowing over the core is cooling the water to the point is isn't hot anymore. This is what it sounds like to me. Question to you... IF you turn on the defroster or heater, does the air get hot?? IF so, then you may have a diverter door that may be stuck open letting ambient air into the vehicle.
  That is all I can think of. I'm a Parts Professional, NOT a Tech... Sorry. Good luck..
Skip

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