Question about 1991 GMC S-15 Jimmy

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Low valume of air out of the heater

The fan is working properly, but there is little valume of air comming out in any direction.

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I had the same problem with my '93 jimmy....the dealer i got it from had replaced the blower with a counter-clockwise direction fan and it was barely putting any air out of any vent. took out the blower and replaced with one that was clockwise rotation, now it will blow your hat off!.......worth a look...not too hard to remove the blower, just remove the overflow tank and you can get to all the screws holding the blower in.

Posted on Feb 07, 2009

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Does the vents swithc from defront to vent and floor or its it stuck on defrost? if its stuck on defrost then open hood check for broken or cracked vac line to hose on the hood. if it switches then remove the blower resistor and inspect the evap core for clogging if it is clean it to restore the flow of air thru heater system

Posted on Jan 20, 2009

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1 Answer

Heater not working at all


The morning commute can be stressful.
But if your car heater starts blowing cold air and suddenly stops working in the middle of winter, it can make it downright miserable.
If your car has no heat, not only would the inside of your car feel like an ice box, but a broken heater can prevent your defroster from blowing warm air to your windshield to eliminate ice and fog, which can pose a hazard while driving. Not having a working heater in your vehicle could even become a dire situation, if you end up stranded.

Why is my car heating not working?

K car heater can stop working for a number of reasons, including:
• A low antifreeze/water level in the radiator due to a leak in the cooling system.
• A bad thermostat that isn't allowing the engine to properly warm up.
• A blower fan that isn't working properly.
• Coolant that contains rust particles or becomes otherwise contaminated and is blocking the heating core from circulating air into the cabin properly

Cost to fix a car heater

Most heating-related repairs range from $300 to $1,000,, but it's difficult to pinpoint an exact number because of the variety of problems that exist.
A decrease in the coolant level or a leak in the coolant system is one of the more common problems,
"Topping it off may help in the short term, but it's an indication of a deeper problem and should be checked out," "You shouldn't have to add anything at all if everything is working well. It can damage the motor if there is low heat [from too little coolant]."
leaks could be as simple as a loose hose clamp, or a major problem like a leaking engine cylinder head gasket, which can cause serious damage to the engine and cost several hundred dollars to replace.

Sep 28, 2016 | 2007 Fiat Grande Punto

1 Answer

Honda Pilot 2003 temperature gauge gets only quarter way hot, and on highway it gets very low. Cabin fan temp is low too. Thermostat and was replaced several times. Cooling liquid was replaced too.


Sounds like you have either low coolant, due to not properly bleeding air from it when the coolant was changed, or the thermostat is not working, or possibly not right for the vehicle. (Honda's typically don't like aftermarket t-stats because they don't work as efficiently as the factory ones. And most are missing a bubble bleeder for air to pass through. (the little ball valve in most t-stats) You should also see if the cooling fans are stuck on all the time. They should cycle on and off fairly quickly as the switch calls for them. Air bleeding is critical as you have a large system with an aux. rear heater unit too. Even a relatively small air pocket trapped inside can wreak havoc on the operation of all related systems.

Apr 01, 2014 | 2003 Honda Pilot

1 Answer

Heater not blowing hot air


IT could be one of several things: possible the blower fan motor is bad; or the valve that lets the hot water in from the engine to the heater core is not opening; or the door that lets the air flow past the heater core and onward to your vents is not opening. All these are controlled by your heater switch, via relays and vacuum lines. If the blower motor works well when you put power to it directly, but not when it is hooked to the car, a connection in the switch or a relay may be bad. if you get little or no effort from the blower motor when you hook it directly to a good battery, it's the blower motor itself gone bad. If you get airflow but not heat, it's the device which diverts the hot water into the heater core. and if its the door to let air flow over the heater core, it could be a relay, a vacuum hose or the switch.

Dec 09, 2013 | BMW 325 Cars & Trucks

1 Answer

Lowheater (temp) output


It could be your blend door or not enough flow through your heater core. Try removing the heater hoses at the heater core and flushing both directions with a garden hose!

Dec 14, 2012 | 1997 Dodge Ram 1500 Club Cab

2 Answers

All of a sudden the heater does not work. Fan works fine, just blow's cold air. Heater worked great yesterday but this morning it does not. It is running a little hoter than usual but not overheating. Any...


check your coolant level. If you have a leak, you could have air in the system preventing flow thru the heater.

Please see my tip at http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Feb 01, 2011 | 1992 Subaru Legacy

1 Answer

Heater fan only works on "high speed"


All cars are designed with a blower fan motor that pushes air through the ventilation system. This air is processed by a series of vents to direct the air to various positions. Example: heater, air conditioner and defrost modes. Most blower motors are power by a basic electrical circuit that utilizes a multi resistor or a solid-state resistor to control different fan speed modes (low, medium low, medium and high). If the resistor malfunctions it may lose one or more of the lower fan speed settings.
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Mar 02, 2010 | 1999 Buick Century

3 Answers

Would the heater control valve malfunctioning make the engine overheat blowing hot air out the heater one moment,then not blowing the hot air, temp gage spikes 225 plus. The motor takes awhile to heat up...


Heater control valve malfunction will not cause engine to overheat unless coolant is leaking externally...Overheating going down the road can be the result of a few different things...Partly clogged radiator...Insufficient air flow due to possible fan problem...External coolant leak...Make sure fans are operting properly and have cooling system pressure tested for leaks...Gaining and losing heat on the inside of the vehicle usually means system is low on coolant but you must find out where coolant is going

Jan 06, 2010 | 2004 Chevrolet Impala

2 Answers

Heater / defroster is blowing lukewarm air only. It seems to work just a little better if the fan is on half. When it is on full the air seems cooler.


is the cooling system full,if so you may hve to get the heater core cleaned as they can plug up if the dexcool anti freeze has not been changed,could also have defective thermostat(stuck open)if you have gauge does it go half way or stay low temp,other causes could be stuck air blend door in heater system

Oct 05, 2009 | 2004 Chevrolet Impala

2 Answers

Heater temperature does not stay hot


1st thing to check is the coolant level. I've seen cars w/ no heat, or very little quite a few times caused by low level in cooling system--not low enough to overheat the engine, but enough that circulation of coolant to heater core is affected (no or little hot coolant circulation to heater core=no or little heat),
Is the engine temp gauge in the normal range? If it's in the low range, engine not reaching operating temp. it could be caused by a thermostat stuck in the open position (or no thermostat, sometimes people remove them when their car overheats, and this should not be done).
Here's how the system works: the heater 'box' contains a heater core (a mini radiator) w/ a fan and hoses connecting the heater core to the engine cooling system. Hot engine coolant is circulated thru the heater core. When u activate the heat switch on the dash, a flap door opens to expose the heater box to the passenger compartment. The fan switch on the dash activates the fan, which blows air thru the core, which heats the air.
So, if it's not the coolant level at the radiator, the fan is obviously working, the engine is reaching operating temperature, I would say it must be the flap door that opens, isn't opening fully, or isn't staying open. It could be the dash switch is defective (not supplying current to open flap door) or less likely the flap door is binding somehow. Hope it's as simple as correcting coolant level, if not, the dash switch control should be checked

Oct 22, 2008 | 2004 Dodge Caravan

2 Answers

Heater


Try spinning the knob real fast in either direction. Sounds stupid but it worked for me.

Sep 27, 2008 | 2005 Chevrolet Malibu

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