I have a 1999 Jeep Wrangler and I the heat is not working. (note: the blower is worker, but blows cold air and heat controls inside the jeep works.; I recently flushed the heater (radiator) and replaced the fluids but still cold air)
Help Me Please
Re: I have a 1999 Jeep Wrangler and I the heat is not...
Did you drill by the passenger side to put mud guard? I did drill into the vacuum reservoir, and it went into default blowing cold air up the windshield check vacuum lines first.
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You may want to check the two water houses that feed the heater core. they both have to be hot. (they are usually located next to the thermostat housing.) If they are cold first check the coolant level. Fill up if needed, then you may have to check of there is an obstruction by the housing or the heater core is clogged up. I would first disconnect the hoses and see inside the thermostat housing with a lamp. Also blow some Air inside the heater core to see if flushing is needed. Well if those hoses are both hot then that must be a problem inside the cabin with the vents selection. Either an electric switch or cable. But there are already a few things to check first.
Could be different problems. The blower uses a resistor to regulate fan speed, the resistor could be faulty. You would need to know if the radiator is full of coolant and if both heater hoses are getting hot. There may be a temp control valve in one heater hose that is not opening up to allow flow thru the heater core.
There is a flap that directs the air. the flap is controlled by a vacuum actuator. This is located inside the venting. The actuator is connected to little vacuum hoses that attach to the temperature control switch. Either the flap is stuck, or the actuator has gone bad.
any time you do not have hot water in the hoses to the in side of the vehicle, your water has quit either due to you having only water in the system and it froze in the winter and you started it . or the propeller just broke of old age. make sure u dont have a check valve in the hoses going to the heater core in side the car. valve would be under the hood somewhere in the duration of one of the two hoses, which is the feed. this should do u good
If the blower isn't working there are a few options.
Look in your fuse box under the dash on the drivers side and check the fuse that should be marked blower motor.
Next, The blower motor relay will be in a long rectangular box, near the battery. It will have a cover with a couple little clips that you have to squeeze to get it off. The lid of the box on the inside will have a diagram that tells you which relay is for the blower motor. If there is another relay with the same number on the back, you can swap it and see if the blower works. That's the easier way to see if that's the problem.
If it's none of those, then it's probably the blower motor itself. I would check to see if it's getting power before you replace it though. It could be the fan control switch on you dash too, but they don't go bad as often.
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