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If you are looking for some sort of water valve that diverts water to/from the heater core, forget it. They don't exist anymore. They went away shortly after the widely adapted use of air conditioning in today's modern cars. Now, hot coolant is routed thru the heater core at all times, but is controlled by a cable-operated, or vacuum operated "blend door" located inside the heater box. If you are not getting heat to the vehicle, there are a few possible problems:
1. Bad thermostat - thus low coolant temperature and lack of heat.
2. Clogged heater core - no water flow thru core, thus no heat.
3. Broken control head - loss of cable or vacuum actuation of blend door.
4. Broken heater box/vacuum tank - no actuation of blend door.
Of the items listed above, based on the age of the vehicle and the likelihood of occurrence, I would investigate them in the order of 2, 4, 1, 3.
Oct 25, 2012 - Uploaded by Lloyd Ankney
1997 Oldsmobile Bravada heater core removal ... How can I replace a blend door actuator on a 99 Bravada? .... Heater core replacement 2000 S10 4.3L ( slideshow picture ) - Duration: 3:52. by Joe Lleras 169,585 views. 3:52.
Oldsmobile bleed air in heater core Cars & Trucks ... - Fixya
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If your cooling system has any bleed screws incorporated, crack them once in a while as well. 2000 Oldsmobile Bravada heater blows cold air. Had a new heater .
If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired. Heater Housing
The heater housing is usually under the dash and must be removed to gain access to the heater core.
Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
The heater housing is disassembled to get to the heater core.
Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
Remove the heater coolant hoses.
Remove the cable and/or vacuum control lines (if equipped).
Remove the heater core securing brackets and/or clamps.
Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.
This is probably the same as it is on the S-10 truck. You'll have to remove the dash to get to the heater core box. Drain the coolant and locate the two hoses on the engine side of the fire wall and remove them. There are large electrical connectors under the dash that have to be unplugged. Remove the large bolts/nuts holding the dash to the frame and drop the steering column to ease removal of the dash. You'll be able to see the heater core box now. Remove the bolts hold it to the firewall and there are also bolts on the engine side of the firewall holding the box in. This is where it gets frustrating. Remove the blower motor resistor that is mounted in the engine bay and inside that hole is another bolt holding the core box in place. With all of the bolts out you can pull the case apart and replace the heater core. Put it all back together and fill the cooling system. Start the vehicle and run the heat on full. Leave the radiator cap off so air can escape. Watch the coolant level and add as needed until the engine reachs normal operating temperature and put the radiator cap back on. The last one of these I did I charged $450 to do plug parts. His next best quote was $950.
the temp control on your dash operates a hot water valve under hood, it's probably vacuum aparated, like the doors in the heater housing, the valve may be close to heater core,check for vacuum leaks around dash control, totally unrelated leaks can cause problems, and yes a blocked heater core can definitly cause the problem,but I would save that unless it's easy to get at, eliminate other stuff first, luck
i belive there is what looks like t perferated line in the plastic where the heater core is that you are suposed to cut to gain access to the heater core. i have never done this but i know several people who have you just need to make sure you get the access door resealed if you go that route or it may affect your heat. remember if you remove the dash instead of the other method you will have to have the a/c system emptied since it also circulates through that box.