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1998 gmc envoy heater problem, fan is working fine but is blowing cold air on defrost and heater.

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Do you smell antifreeze? If you do, then your heater core needs replacing.
If not then try these solutions:
Priority Action Part Type Cause 1 Inspect Cooling System Mix Coolant level low or flow is restricted. 1998 gmc envoy heater problem, - grey_line.gif 2 Inspect Thermostat Thermostat stuck closed grey_line.gif 3 Inspect Heater Control Valve Leaking or defective heater control valve.

Posted on Jan 19, 2009

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Posted on Jan 02, 2017

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My 2003 GMC Envoy sometimes shuts off while driving


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Sep 23, 2009 - My 2004 envoy has been cutting off ever since I replaced the battery. ...over beyond to the right and sometimes drops down way past the final. ... My enginecuts off when running air or heat what's the problem. 2003 GMC Envoy ... has recently started cutting off while in park and still on and while driving.

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1 Answer

Why would my combo A/C - Heater unit not blow air while heating or cooling is selected but will blow air just fine when set to "fan only"?


Sounds like wiring issue to me. I've delt with units like this and there is a wire lead for fan only and a separate one to run the fan when the unit is cooling or heating. I'm only speculating here but I would bet money that this was improperly installed.

Dont get discouraged though because it sounds like its working (for the most part) if you feel up to the task find the manual and check your connections. Otherwise hire a professional.

Sep 20, 2014 | Heating & Cooling

1 Answer

How do fix a/c on 2003 yukon it blow cold then hot than back to cold


A few possibilities:
Stuck or inoperable Air-flow Diverter:
There are tow types of air-flow diverters: Vacuum Actuated and Slide-Cable Actuated (some will have an electric solenoid that controls a vacuum actuated type). In either case the default position of the diverter is "cold air" or closed - blocking air flow over the heater core. Sounds like it may have a vacuum actuated control - when it looses vacuum it will let the air-flow diverter swing shut blocking off air blow through the heater core resulting in "cold air" Could be a bad control/slider, bad or loose hose, or bad actuator. If you remove the blower motor assembly you will be able to see the diverter and might be able to tell the issue is.
Stuck or inoperable heater valve:
This valve controls the flow of engine coolant to/through the heater core. It is normally closed - blocking flow. This can be vacuum operated or cable controlled just like the air-flow diverter. Simple to check - in the engine compartment, to the left of the engine locate the cooling (heating) lines that go into the fire wall - locate the valve and check its operation.
Another possibility is low coolant level in your engine/radiator which may be too low to allow flow of the coolant through the heating coil, although you would likely notice that the engine was over heating/running hot.

Sep 13, 2014 | Flex A Lite 2003 GMC Yukon XL - 6.0L V8 -...

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I have a danby(simplicity) portable airconditioner,was working fine till i heard ice droping into the fan(crunching noise).after that,it does not blow cold air anymore.any ideas what the problem could


Is the fan no longer running, or is it now blowing room temperature air? If it iced up enough to drop ice into the fan it may have simply gone into defrost mode. Unplug it and make sure it has completely defrosted - if it ices up quickly when powered up again, you likely have a problem with the condenser lines.

Jul 14, 2012 | Danby Heating & Cooling

1 Answer

1998 GMC safari heater and air condition was working fine but all of sudden heater failed to blow hot air only i get cold air i think the panel celector woking properly please let me know what do u think


The panel selector may be working, but the blend door inside the heater may not. Also, check you coolant level and the condition of the coolant, Is it dark and looks like coffee grounds? If so, the coolant has failed and may have clogged your radiator, as well as the heater core. You can try flushing the radiator with radiator flush (follow the manufacturer's instructions) and refilling the radiator with new coolant. If you do, pour slowly with the engine running to get all the air bubbles out.
The flushing alone probably not clear the heater core if it's severely clogged. That will need to be blown out. Keep in mind that most of the parts in the heater core are plastic, so be careful if you try to blow it out, yourself

Hope these solutions help to heat things back up.

Feb 23, 2011 | Heating & Cooling

1 Answer

Inside fan turns on when outside unit is in defrost mode when heat is selected. This causes it to blow cold air for about 10 to 15 minutes prior to the outside fan starting.


The inside fan will run while the unit is in defrost. The electric heat strips should kick on to help prevent you from feeling this cold air. When the unit is in defrost it is essentially running in the A/C mode. You should make sure the electric heat elements are working then go from there.

Dec 11, 2010 | Goodman PHKJ048-1 Air Conditioner

1 Answer

Indoor fan blowing cold air when on heating


The indoor fan will continue to run. When heat pump goes into defrost the outdoor fan stops, the reversing valve switches and the unit is basically working in the cooling mode. In order for you not to feel a blast of cold air in the winter the electric strip heat also comes on so the indoor fan must run while the strip heaters are on.

Jun 03, 2010 | Heating & Cooling

1 Answer

Fan freezes up with ice in winter


They need air, do not cover it when in use.

If ti cools fine in summer then you just have a defrost problem.

Make sure the outdoor coil is clean.
If the coils are clean, then you have a bad defrost control.

In heat mode the unit should go into a timed or temp controlled defrost. If it is frosting up to the point of stopping the fan, in heat mode only, and otherwise operates properly, then its a bad defrost control.

It is reccomended that the defrost temp sensor be replaced at the same time the defrost control board is replaced. Some temp sensors are part of the board and not a seperate component, but not most.

Aug 19, 2009 | GE Zoneline AZ25E12D3B Air Conditioner

1 Answer

Heater keeps cutting off as if it reached the set temp.


sounds like its in defrost mode and the electric aux heat is not working

Feb 20, 2009 | EdgeStar Portable Air Conditioner Heater

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