Question about 1998 Chevrolet S-10 Pickup

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Heater motor problem

Heater motor runs full time very slow, normal for ventilation purposes.
When used on A/C, it still runs slowI..
When used for heat, the control has 3 speeds, none of which seem to work.. The motor has only one wire to it, the other side must be grounded through the mounting. What gives it the 3 speeds,? Is there by any chance a pc board in the circuit to contol the speeds.?
If so, give me a clue where to look for it.

If I put separate 12 volt power to the motor lead, it runs like crazy..

Thanks for your help... Harry in Easton, Pa.

Posted by omega_1433 on


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Replace the switch

Posted on Jan 03, 2009


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1994 jeep cherokee i had the A/C looked at results are no leaks and full of freon found the A/C has no problems but still have a slow/weak blow of minimal cold air. does nothing to cool the vehicle but...

If the air-con working ok and full of gas it will be cold and the compressor clutch does click on and off. You say slow or weak air through vents. When was the last time the pollen filter was changed as heater motor air may be restricted by this if dirty or heater motor performance poor.

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Hi just wonder why my 2000 cavilier would still blow hot air when the heater is shut off

The vehicle is probably engineered that way, years back GM introduced what they called Astro ventillation tyo the Chevette line of vehicles, I had just started working for a dealership that was going to be slandered all over the news because they couldn't repair the vehicle from blowing warm air even though the fan and heater slide were turned off.
This was my first job in the dealer after the problem went around the shop for a month or two, I found an article paragraph on the first page of our in house reair manual for heater and air condition trouble shooting Chevrolet Chevette, it stated that the car with the key on whether running or not would keep a constant flow of air throughout its outer body skins called an Astro Ventillation system and its purpose was to keep any toxic and/or flammable gas fumes out of the vehicles cabin space.
It was around for a long time and probablyl is the reason why you have this same condition of warm air flow, its a constant turning of the heater blower fan.
Happy Motoring!!!

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Heater works when you drive at 65 mph

your either low on coolant or the heater core is restricted, check your coolant level in the resovoir while it is running and if it is full feel the heater hoses runing into the fire wall they should both be pretty hot if the vehicle is at normal operating temperature, if one hose is much hotter than the other, almost cold, at an idle then the heater core is clogged. SOMETIMES you can switch the two hoses around by removing the quick disconnects and just install them with hose clamps and reverse the direction of the coolant flow through the heater core causing the blockage to be pushed out from the heater core but replacing it would be the suggested method

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Yes.....The overall purpose of the thermostat is to keep the engine at a specific temperature for combustion purposes.
If the thermostat is open all the time:
1) Engine warm up is slow, heater and defrost function will be delayed and heater out put will be low.
2) Excess fuel consumption, fuel mileage will decrease due to low coolant temperatures.
3) Emissions testing will fail.
4) Excess carbon build up on spark plugs and combustion chamber, engine performance will begin diminish.
5) Moisture will condense on inside of engine crankcase causing oil contamination.
These are just a few things that will be caused by low coolant temperatures. Some will not occur immediately, but left unfixed, will decrease engine and transmission life expectancy.
Hope this helps, you can get by for a short time but it does need to be fixed.

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The fan motor can be checked by using jumper wires. remove the wiring connector from the fan.Run the positive wire from the battery to the positive on the fan and the ground to ground. It should turn smoothly and at normal speed at 12 volts.If it is slow and noisy, the bearings making the noise. This indicates the motor is bad.

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Heater problems

If you smell coolant , there is a leak. I'm leaning towards a leak in the heater core if no fluid is visable and you smell it.
Pull the blower motor off and look inside to see if it is wet.
Have you had any issues with the radiator in the recent past? Maybe tried to correct it with stop-leak and didn't open the heater to full on hot? (maybe clogged the heater core up?)

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