I have a 97 Bonneville with digital climate control, and I have just replaced the heater fan. Now the new fan only works intermittently and more often than working it's not! It heats up okay, so when it dose work it's blowing hot. What can I do, if any thing? Thanks Chris....
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Most likely it is the heater control valve that shifts air from blowing across your heater core to your air conditioner core.
If your fan works and your car is fairly new..meaning your heater core isn't dirty and full of craap...then it is the climate cotrol valve.
If you are lucky, it might be a thermostat that is bad and blocking hot water from entering your heater core. Bottom line, if hot water doesn't circulate thru that little heater core, you won't get heat.
You might be able to look under the hood and grab the hot water lines that go thru the firewall and feed your heater core. If they feel cold to the touch after engine has warmed up, then you aren't getting circulating water to the heater core. If they feel nice and warm, then the heater core is fine, but your climate control valve has closed off the fan that blows across the core to disperse heat into the cabin
the heater core is removable from the climate control unit. The climate contriol unit has to be removed to replace it. The A/C system must be evacuated and lines removed as well as the dash, to access the climate control unit. The steam is coming from a leaking heater core.
REMOVE HEATER BLOWER MOTOR HOT WIRE BLOWER MOTOR IT.IF IT WORKS.YOUR AC AND HEATER CONTROL SWITCH IS FAULTY.CHECK HVAC FUSES AND CHECK BLOWER MOTOR RELAY.IF BLOWER MOTOR DONT WORK WHEN HOT WIRE REPLACE IT.IF ALL CHECK OUT GOOD.HAVE DEALERSHIP DO A DIAGNOSTIC TEST ON YOUR CLIMATE CONTROL SYSTEM.
Drain the cooling system into a clean container for reuse.
Remove or disconnect the following:
Heater hoses from the heater core
Right sound insulator
All necessary electrical connectors and remove the instrument panel compartment
Temperature valve actuator
Electrical connector and remove the HVAC programmer
Heater core cover-to-heater assembly screws and the cover
Heater core-to-heater assembly screws and the heater core
Fig. 1: View of the heater hoses and clamp positions — 1997–01 Bonneville and LeSabre
Fig. 2: View of the heater core cover — 1997–01 Bonneville and LeSabre
Install or connect the following:
Heater core and the heater core-to-heater assembly screws, then, tighten the screws to 12 inch lbs. (1.4 Nm)
Heater core cover and the cover-to-heater assembly screws, then, tighten the screws to 12 inch lbs. (1.4 Nm)
HVAC programmer and connect the electrical connector
Temperature valve actuator
Instrument panel compartment and connect any necessary electrical connectors
Right sound insulator
Heater hoses to the heater core
Refill the cooling system.
Connect the negative battery cable.
Operate the engine to normal operating temperatures; then, check the climate control operation and check for leaks.
Does the car have a climate control system? Could be the heater/AC control or the associated sensors have a problem.
The other required part of the system are the heater resistors. These allow for speed control. They could cause intermittent behavior, but would never cause the fan to run all the time.
you may have a failed blend air door motor/actuator. this part will regulate the amount of air from the heater core depending on the temp setting on your electronic climate control unit. if it has failed, it will be stuck at the temp that it was last set at when it quit working. it is also possible the heater core may be plugged up, but using the gm recommended dexcool coolant and flushing it out every 5 years, it should not be plugged up. you can pull the 2 heater hoses off the heater core on the passenger side of the engine compartment firewall and see if the heater core is the problem. caution-do not use a high pressure air hose to blow through the heater core as this could damage it and cause a leak!
there is no resistor but it does have a digital fan control module located under the hood above the fan motor in the heater box. you will need to remove the plastic cover again the firewall.and the the module will be under the relays.