Look near or behind the alternator. The valve that controls flow of coolant to the heater core on my 1987 Aerostar is located on the left wall of the engine compartment. I imagine the 1991 is similar. Trace the heater hoses from the engine/water pump and you will find it.
You can bypass your 1988 Buick Skylark heater core by removing the heater core water supply hoses. There will be to water hoses. Connect the water hoses to each other.
you should check to see that heater hoses are connected through the fire wall and they are connected to the heater core.
could be a number of things radiator,thermostat,water pump heater core, low coolant old coolant bad hoses,
Remove the water supply hoses from your 1993 Chevy Corvette heater core. Some water will drain out of the hoses and the heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
The heater core, in a Saturn and 1200, is held in place by four bolts and two water hoses. Remove the bolts and the water hoses. The heater core will come out. Reverse the process to install the new heater core.
Bolt the heater core into place, with the four retaining bolts. Connect the water supply hoses. You might need to bleed one of the hoses to get the water flowing through the heater core.
rad hoses route coolant to the engine to maintain operating temperature (to keep engine from overheating). Heater hoses supply the heater core (inside most vehicles) with hot water, when heater/ac temperature control knob is turned toward hot, to heat the interior of the vehicle by opening and closing a water flow control valve allowing water to enter the heater core for heat. =;)
This fluid can leak from many places. Look in places where water hoses meet the engine, where the heater hoses go into the firewall, the radiator and your heater core.
bypass the heater core by connecting the two heater hoses togethetr or replace heater core
you may not have the heater water hoses plugged in
the heater core water pump hoses including the heater hoses
Remove both heater hoses from the engine, then fabricate a fitting to attach a garden hose to one of the heater hoses. Direct the remaining hose into a bucket then slowly turn on the water until the water runs clean. Then reverse the flow by switching the garden hose over to the other heater hose and repeat until the water runs clean. Then replace the hoses to the engine and refill the coolant reservoir.
The heater core can be flushed out and hopefully be unclogged. A water hose can be hooked to the heater core hoses, and water flushed through to clean the core out.
With the vehicle warmed up and running feel both heater hoses with your hands. If one is hot and the other is luke warm or cold, the heater core needs to be flushed by itself. Flushing the whole system doesn't unclog the heater core. Disconnect both heater hoses from the engine, fabricate a fitting to attach a garden hose to one of the hoses. Direct the other hose into a container and gently turn on the water until the water runs clear, then reverse hoses and run again until clear. Reattach hoses to engine and refill reservoir.
Remove the water supply hoses from your 1997 Nissan heater core. Remove the heater core retaining bolts. The heater core will come out.
Drain the water from your 1988 Chevy cooling system. Remove the heater core water supply hoses. Remove the heater core retaining bolts. The heater core will come out.
Remove the water supply hoses from your heater core. Remove the heater core retaining bolts. Reverse the process to install your new heater core.
This is an indication that your heater core is leaking. To stop the leaking you will have to replace the heater core or stop using your heater.
Drain the water from your 1972 Chevy Nova cooling system. Remove the heater core water supply hoses. Remove the heater core retaining bolts.
I would disconnect both heater hoses from the engine, then fabricate a way to connect a garden hose to one of the hoses leading to the heater, then gently turn on water supply for a minute, then attach garden hose to opposite heater hose and flush again, then reattach both hoses to engine and top off coolant reservoir.
I disconnect both heater hose off of the engine, then fabricate a fitting that will attach a garden hose to one of the heater hoses. While directing the other hose towards a bucket, I gently turn on the water supply to wide open and let the water run until it shows clear, then reverse the flow into the heater by switching hoses and repeat.
Check your heater hoses, that's where the water ciruclates into the heater from the water pump.
Remove hoses. Inject water into heater water output connection but be carefull not to use full pressure of house supply.