C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Meziere Water Pump Question....

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Old Jan 21, 2002 | 12:25 PM
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Default Meziere Water Pump Question....

I have the Meziere HD Electric waterpump on my 95. My heater doesn't work and I can't figure out why. Is it possible that the waterpump is spinning backwards and preventing coolant from entering the heater hoses? I can grab the heater hoses at full operating temperature and they are just barely warm. The only thing that puzzles me is if the water pump was spinning backwards - why does my car run at normal temperatures??

Tim
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Old Jan 21, 2002 | 12:27 PM
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Default Re: Meziere Water Pump Question.... (I_HATE_Mustangs)

It shouldn't be spinning backwards. You did connect the blue wire to 12v and the black wire to ground? If it was spinning backwards your car would overheat. You might want to check your heater hoses for obstructions.
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Old Jan 21, 2002 | 12:29 PM
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Default Re: Meziere Water Pump Question.... (Nathan Plemons)

Yep, Blue wire to 12v and black wire to ground. It definitely works, I have had it on there for over 4,000 miles with no problems.
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Old Jan 21, 2002 | 12:46 PM
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Default Re: Meziere Water Pump Question.... (I_HATE_Mustangs)

Could be air in the system??????????
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Old Jan 21, 2002 | 12:50 PM
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Default Re: Meziere Water Pump Question.... (mackeyred96)

Could be air in the system??????????
That's what I was thinking but when I open up the purge valve coolant flows out.... That's good right? Should only flow air if there is air in the system and then flow coolant if there is no air?

Guess I should just drain my coolant and pull the heater hoses to check for obstructions :confused:
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Old Jan 21, 2002 | 01:25 PM
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Default Re: Meziere Water Pump Question.... (I_HATE_Mustangs)

You might have an airlock in the heater core. You can run pressurized water through both directions and that should eliminate it and clean the core some at the same time. Also, you may have something wrong with the temperature control valve (I have no idea where this is on the vette, probably buried somewhere and electronic), but it acts like a gate valve. If it's closed...no circulation, or very little. Stupid thought...check you fuses, maybe the circuit that controls the heat valve is blown and its not operating. Just a thought.
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Old Jan 21, 2002 | 01:49 PM
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Default Re: Meziere Water Pump Question.... (I_HATE_Mustangs)

I doubt it's air in the system. That's one of the other benefits of the electric pump, you can purge it with the motor cold. If the hoses aren't even getting hot then I don't think the coolant is getting there. Otherwise I would say make sure that the heater vents are functioning properly.

It almost has to be an obstruction somewhere.
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Old Jan 21, 2002 | 01:50 PM
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Default Re: Meziere Water Pump Question.... (emoshn)

You can run pressurized water through both directions and that should eliminate it and clean the core some at the same time.
Like from a garden hose nozzle? Or more like a pressure washer?
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Old Jan 21, 2002 | 01:55 PM
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Default Re: Meziere Water Pump Question.... (I_HATE_Mustangs)

I don't think I would try the pressure washer unless you fell like replacing the heater core soon.(not much fun) :eek:
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Old Jan 21, 2002 | 02:03 PM
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Default Re: Meziere Water Pump Question.... (Ramrod92)

Don't worry, I don't have a pressure washer - I was just trying to figure out what he meant by pressurized water....
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