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If (BOTH) hoses are hot U might have a mixer door problem-A bad Actuator will do it,OR U could just have a small Vacume hose off - under the dash on the passenger side OR under the hood - Check from the Intake manifold 2 the fireeall on the passenger side.

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โˆ™ 2004-12-16 23:42:18
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Q: Why would a 99 Jeep Limited heater lines get hot but it only blows cold air?
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Related Questions

1989 corvette heater blows cold air even though both lines are hot going to the firewall do you have to change the heater core and if so how do you do it?

I would say that your heater core is sounds like you have a bled door promlem in the dash.

Why would your heat only work on defrost?

ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?

Why would a 2000 Saturn heater only blowing warm air?

it is a heater. heat. it blows heat. warm air

Why would a jeep wagoneer limited have hot heater lines and only blow cold air?

The thermostat could be stuck closed. the heater core could also be plugged or the door closes when you use ac and opens when you use the heater may not operate.

Why would you smell antifreeze through your defrost?

Blown Heater Core - The heater fan blows past the heater core and if it has a hole in it your antifreeze ios being blown onto your windshield.

What would cause a humming sound when car heater is turned on high?

The motor which blows air through the vents.

Why would an engine run cold temp gauge says cold and the heater blows slightly warm air?

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Why does heater blow cold at idle only blows hot air when accelerating temperature gauge shows normal Chevrolet Impala 2008?

If the coolant level is okay, I would suspect a restricted heater core. Try flushing the heater core.

Which fuse would be bad if the heater blows out cold air?

No fuse for those symptoms. Could be low on coolant. Bad thermostat. Plugged heater core (my guess). Temp blend door problems.

The rear heater in your 99 Astro van blows only cold air the front heater works fine any ideas as to what might be the problem?

The line or core is probably plugged, or if it has a manual or vaccum switch check to see that it is not corroded. If it moves freely, I would find both lines to the core (heater), disconnect them and drain as best you can. I would pour some flush into the lines and let it sit in the lines/core for 15 minutes then attach a garden hose and flush the crap out. I usually install some cheap clear plastic tubing on the core/lines to let gravity help me and to direct the waste away. Remember to top off the rad.It will heat good then. I hope this helps you. Mark

Why would your ford 150 leak radiator fluid when the heater is used?

because the heater uses hot coolant/antifreeze to heat your car....the coolant passes thru the heater core, then a fan blows the warm air thru your vents Your heater core is leaking and must be removed and repaired or replaced.

What would cause the heat to stop blowing in a 2004 Impala?

most likely your heater-core went bad. if you car runs perfectly fine besides having heat. if you car gets up to normal temperatures, doesn't over heat. the fan blows, but just blows cold air. then it is the heater core.

Why would a car heater blow cold air but when it's moving it blows hot air?

check heater core could be cloggedCheck the engine coolant level also.*no, the heater relies on the engine for heat and when you drive the engine warms generating heat:)*

1998 transport over heating. when the temp gauge is normal heater is blowing hot when temp gauge gets hot heater blows cool replaced thermostate Why would it be over heating?

This would indicate that the system is low on coolant when the gauge is hot. Not enough coolant to service the heater core.

Why would a car only blow cold air when driving?

Only blows cold air with the a/c on while driving, your cooling fan or fan clutch is bad depending on the year, make and model.......... Only blows cold air with the heater on while driving, you will have a bad or broken internal a/c - heater control door.....

What causes heater not to get hot in 1999 gmc truck?

air pockets in the cooling system, start by bleeding the lines, plus there is a bypass for the heater core when you have the a/c turned on, or your heater isn't on, this fluctuate between makes and models. but i would go to youtube and look up how to bleed coolant lines, and that should make it easy for you.

What would cause 2003 GMC Savanna Conversion rear air not to be blowing cold air still blows but is warm but front air works fine?

The heater hose vacuum operated switch that sends (and recirculates) hot antifreeze to your rear unit is stuck open. It is usually located in the near the radiator - or you can simply trace the heater hose lines underneath the vehicle from the rear unit to the front of the van.

If the heater died in a 1993 Oldsmobile Cutlass Supreme would it be a fuse?

Yes, if the blower isn't working. If it turns out to be the fuse, and it blows again, you probably have a bad blower motor.

What would cause a 98 dodge 1500 4x4 heater to blow luke warm air?

Any heater that only blows luke warm air isn't getting warm or hot water to the coil. This sounds like a problem with the thermostat not closing, and allowing the engine to heat the water properly for the heater.

Why would steam come out of the heater if heater core is good?

no.....the heater would have to be leaking

Why would a 1993 Pontiac Grand Am be leaking coolant from an elbow hose located by the AC HighLow pressure lines?

heater core

What would cause a heater to work improperly in a Ford F 150?

Assuming the blower fan is working but it blows cold air, it could be,Faulty temp blend door actuator.Plugged up heater core.Faulty thermostat,Low coolant level,

Where can you find vacuum lines for heater on 04 Chevy pickup?

You would find the HVAC vacuum line routing in a shop manual for that vehicle.

Can someone show you a pentagon with 2 parallel lines no right angles and no horizontal or vertical lines?

No because the shape would have two right angles because of the parallel lines and the limited number of angles available...just no.

Can you drive a truck wthout a heater core?

Sure. You can by-pass the heater core but you won't have any heat for defrosting the windshield should you need it.