Question about 1998 Chevrolet Venture

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My 98 Venture's heater only blows hot air at highway speeds. Replaced theremostat didn't fix problem

Blows cold air unless at highway speeds. My temperature gauge bouces around alot but doesn't over heat. Replaced the thermostat and that didn't solve the problem. Any suggestions?

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  • 373 Answers

Could be your cooling system plugged up, or airlocked. Usually if your heater core is getting plugged, it wont allow coolant through causing heat only when there is more pressure. If you have changed your thermostat, did you drain coolant off? If so, it may be the air lock, but it does sound like your heater core is getting bad. Do you ever hear a gargling sound after shutting vehicle off?. In some circumstances, it could also be your radiator getting bad, but you should be able to inspect the condition of that. Hope it helps.

Posted on Jan 02, 2013

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It sounds like it is low on coolant. Maybe try taking a heater hose off to let air out as you add coolant. This is just a guess, not a surefire remedy. I know dodge trucks have to be blead to let the air out of the cooling system, haven't heard of it on your vehicle. But heck, it cost's nothing to try it. If it doesn't, you may need to replace the water pump. It may be wore out and only pumping enough water when the engine is revved up. That is most likely it.

Posted on Jan 02, 2013

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Posted on Jan 02, 2017

hankfan18436
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SOURCE: 2000 Chevy Silverado 4X4 - Heater isn't blowing hot air

No your thermostat is stuck open which will not hurt the engine. but needs to be replaced, the thermostat is what allows the engine get up to operating temp. before allowing water to flow through the radiator and when it is stuck open it doesnt allow the engine to reach operating temp. so the heater never gets hot. I hope that helps you out.

Posted on Nov 24, 2008

  • 217 Answers

SOURCE: '98 S-10 heater blowing cold air - not hot air

will the air flow switch from floor to the mid to defrost? if so then we have a problem with the tempature door actuator. easy to replace just in tight place. Keep me posted for more help or if this was any help thanks

Posted on Jan 31, 2009

  • 66 Answers

SOURCE: Truck overheat after thermostat was replaced. Blows cold heat too

Have you checked the coolant to make sure its full.Try this.Run the truck with the radiator cap off and let it warm up.When it reaches normal temps sqeeze the rubber hoses.These hose should be a little hard to squeeze.If they are the thermo and water pump are fine.

Posted on Apr 28, 2009

  • 108 Answers

SOURCE: Air, no heat '98 Astro. No leaks, engine

It sounds to me that you may have 2 problems. 1). Air Lock in the Heater Core. 2). Inactive Heat Damper in the Plenum.

But since you state that the Heater Hoses do not get warm that is indicative of an Air Lock in the Heater Core. This is a relatively simple fix. It is best performed COLD but requires a method of pressurizing the Cooling System. All reputable Auto Parts stores Sell and/or Rent Pumps that temporarily replace the Radiator Pressure Cap for Leak tests and curing Air Lock. The Collant Level must be filled FULL then pressurized and then loosening the Highest Heater Hose at the Firewall so that Air and a Small Amount of Coolant escapes. Once all the Air has escaped tighten the Heater Hose Clamp, remove the Pressure Pump, Restore the Collant Level to FULL, re-install the Pressure Cap and Start the Engine. As it Warms up you should be able to feel coolant running through the Heater Hoses and they should become warm.

Posted on Dec 07, 2009

geo5734036
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SOURCE: heater only blows Very luke

Read all of these instructions before starting this job.
First test your heater core for flow by disconnecting both heater core hoses from motor and forcing air from an air compressor into one of them watching for flow from the other. If you have no flow then you may need to backflush your heater core - it is possible you have blockage in it. Your local auto parts store has a backflush kit you can buy that will have a backflush valve ( to be added to your supply heater core hose ) and an additive to put in your coolant system. The kit will not include new coolant so you will need to get that too. Install valve and connect a garden hose.Run motor specified time in the kit. Remove lower hose from your radiator and turn on the water from the hose full blast. Watch the coolant coming out from your radiator to see if any chunky stuff comes out - also watch for the color of the flow. Run water until it comes out clear, then shut off water and disconnect garden hose. Allow system to drain, reconnect radiator hose and cap flush valve. Refill coolant system, turn heat on high and run motor until it is warm. Top off coolant in radiator ( be careful - the pressure may cause coolant to spray out when you remove cap - put a rag over the cap before you remove slowly). If you do not have warm air at this point you may have a bubble in the heater core and may need to block rear wheels then raise the front of the vehicle until the radiator cap is higher than the heater core. Restart vehicle and turn heater on high . Check coolant level in radiator and top off, then cap radiator and shut off motor. Lower vehicle and start again with heater on high. If you still have no heat then your heater core may be plugged. To check, remove both heater hoses from motor and force air from an air compressor into one of the hoses, watching for flow from the other hose - if no flow then core is plugged and needs to be replaced, but if you have flow then you still have an air bubble in the system and need to purge using the above steps until you have heat.
Hope this helps and please rate my solution - good luck!!

Posted on Nov 29, 2010

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