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I couldn't find a heater hose diagram specific to the 1999 Chevrolet Venture with rear heat and air, but I can give you the general location of the heater hoses and how to identify which ones go to the rear heat.
The heater hoses on a 1999 Chevy Venture are located on the passenger side of the engine compartment. There are two heater hoses, one that is hot and one that is cold. The hot heater hose will be connected to the heater core, which is located under the dashboard. The cold heater hose will be connected to the engine.
To identify which heater hose goes to the rear heat, you can look for the hose that is connected to the heater core outlet that is labeled "Rear Heat." The other heater hose will be connected to the heater core outlet that is labeled "Heating Core Inlet."
Once you have identified the heater hoses that go to the rear heat, you can reconnect them to the heater core. Be sure to use new clamps when you reconnect the hoses.
Here are the steps on how to replace the heater hoses on a 1999 Chevy Venture with rear heat and air:
Disconnect the negative battery cable.
Drain the coolant from the radiator.
Remove the heater hoses from the engine and heater core.
Install the new heater hoses.
Fill the cooling system with coolant.
Reconnect the battery cable.
Start the engine and check for leaks.
Replacement of the heater core is not usually necessary unless it is leaking -- you can see or smell coolant inside the cab.
When the engine is running and warmed up, with the heat set for full hot, are both heater hoses hot? If not, you can try back flushing the heater core. There are several good videos on YouTube showing how to do this.
If both hose are hot but no heat, with the controls NOT in the recirculate mode, is there (cold) air movement through the vents inside the cab? If no air movement, your air intake plenum (area under the grill below the wiper blades) may be plugged up, blocking air intake to the blower fan.
Check your thermostat first,could be staying open,not letting your coolant to heat up.If not that then the heater core could be bad.Here's how to check and remove,Here's how to replace heater core.
The cooling system should be flushed but lets start with the heat,remove both hoses from the heater core, install hose to each end of the core about 3 ft long next take waterhose and and start to flush out start with one side and flush with hose on full water, then move to other side , do this a few times, water flow should be clean and flow good, after that if the heat is still warm replace the thermostat and that should solve the problem. good day.
The right side hose coming from heater core runs into a connector. There is a hose parallel to this connector. At the end is what your looking for. If your wanting to replace this cause your heater doesnt work id recommend flushing your heater core first. My heat didnt work at all flushed it yesturday and works like a charm.
Inspect/Replace
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.
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.
it sounds like your heater core is leaking. Check to see if your coolant level is low. A radiator pressure test will show a leak. coolant may be dripping down from the heater air box drain hose. Replacement of the heater core is expensive. you can bypass the heater core, to keep you on the road, by looping one of the heater hoses back to the engine....but you will have no heat. Here are a couple of sites for reference;
Check the valve on the upper heater hose and make sure it moves,if it does then you need to have the heater core flushed.You can do it your self by removeing the heater core hoses from the heater core and runnin water through it with a garden hose but a rad shop can do a better job.If you choose to do it yourself pick up a bottle of rad cleaner first and put it in the rad a few days before you flush it.
my truck did the same thing. i unhooked the two heater core hoses, and then back flushed the heater core with a garden hose. seems to work pretty good so far
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