Question about 1998 Chevrolet S-10 Pickup

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Cool air coming from heater

What should I check first if my heater is blowing cool air instead of hot...if you say the coolant may be low, how do I check it?
If that doesn't work, what should I check next?

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  • 45 Answers

Try replacing thermostat it could be that it is stuck in close position

Posted on Dec 23, 2008

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Brian032472
  • 150 Answers

SOURCE: Frequently loss the coolant and

You are losing coolant if you have a coolant pressure tester follow the directions and use it. If you don't when the car is cool use a 50/50 solutuion of water and coolant fill system and check all the listed items carefully with a flash light and look for leaks. It is either a bad hose, cap, water pump or radiator. Your coolant circulates through the dash and the blower blows throught the heater core to produce heat. No coolant no heat. I would also check the passanger side floor for anti freeze or moisture could be a leaking heater core also.

Posted on Nov 02, 2008

  • 480 Answers

SOURCE: 2001 BMW Z3 2.5 my

i would have the cooling system flushed and have the heater core flushed seperate half the time the heater core gets clogged with crud and you get very little coolant flow through causing no or poor heat.

Posted on Dec 07, 2010

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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1 Answer

2000 caddy Seville ...after starting and engine warm turn on the heater and it blows cold air. Fan works / waiting for hot air and then all the sudden it kicks in. Engine at normal temp


Low coolant, if there is an air pocket in the engine it will make it to the heater core. Once there , the air coming out is cold/cool. Once the coolant fills the heater core, it gets hot. If the coolant is fine hot or cold, then have the HVAC system scanned.

Oct 09, 2016 | 2000 Cadillac Seville

2 Answers

Heater blows cold air


Check the coolant level, low coolant can cause this. The other thing is the heater controls. Generally not the dash but the controls behind the dash that blend the hot and cold. The blend door might be stuck, broken or loose. You can usually see the controls under the dash behind the glove box

Feb 15, 2014 | 2000 Dodge Durango

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My 2008 dodge ram temp gauge goes from normal to high ,check gauge lite comes on in a few minutes temp gauge goes back to normal but heater will only blow cold air I,ll shut heater off wait a few minutes...


Souds like it's way low on coolant. The heater will blow cold air when the cooling system is so low that there is no water (coolant) running through the heater core. Then the thermostat opens, it trys to be normal but the system is low so it gets too hot in just a few minutes. If its that low, there must be a leak somwhere.

Nov 05, 2013 | 2008 Dodge Ram Pickup 1500

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Heat goes in and out and the temp gauge goes up and down


Your temp sensor has nothing to do with your heater. The temp sensor needs coolant in order to work properly. So first check the coolant level because if it is low your heater will act the way you describe. Once the coolant gets low enough the heater will blow cold. Another possibility is the radiator cap. After the engine has warmed up it expands when it cools down it contracts. As it is contracting if the cap is weak air can be drawn into the system and cause air pockets to form and will cause the same problem

Feb 09, 2013 | 2000 Pontiac Grand Prix

1 Answer

My S reg ford escort diesel only blows cold air or very luke warm air can you help?


CHECK FOR LOW COOLANT,NOT ENOUGH COOLANT IN THE SYSTEM.IF COOLANT LEVEL OKAY.THERMOSTAT NEED CHANGING STUCK OPEN.IF THERMOSTAT BEEN REPLACED.CHECK BOTH BOTH RADIATOR HOSES AND HEATER CORES HOSES THEY ALL SHOULD BE VERY HOT.IF ALL HOSES HOT AND BOTH HEATER CORES HOSES GOING INTO FIREWALL IS HOT.HEATER DOOR NOT OPEN ALL THE WAY OR STUCK.IF ONE OF THE HEATER HOSES GOING INTO FIREWALL HOT AND OTHER HEATER HOSE COMING OUT OF FIREWALL NOT HOT.MORE LIKELY HEATER CORE PLUGGED NEED TO FLUSH OUT COOLING SYSTEM.FLUSH OUT COOLING SYSTEM IF NOT BEEN DONE IN A LONG WHILE.

Nov 04, 2011 | 1998 Ford Escort

2 Answers

The heater is only blowing cold air.


The first thing to check is the level of your antifreeze (engine coolant) If it is low, the heater will not have any flow of the hot coolant to heat the inside of your car. If the coolant level is low, you need to find out why it is low. The coolantis in a sealed system and you should never have to add any to it. The only way it is going to be low is if there is a leak somewhere in the cooling system.

If the coolant is not low, the problem could be a bad thermostat. The thermostat controls the flow of coolant through the radiator and thus keeps the engine at operating temperature.

If the engine is at operating temperature and the coolant level is ok, then you probably have a problem with the blend-air doors or the controls for them that adjust the temperature of the air coming out of your heater and vents.

Dec 05, 2010 | 2002 Saturn Sl

1 Answer

Hot air blows but cools down in 15-20 seconds.


You likely have a restriction in the heater coolant hose circuit - perhaps a coolant control valve not fully opening, or a kinked hose.
Insufficient coolant volume is flowing to keep the heater core hot.
Try back flushing the heater core system with a garden hose to check flow.

Nov 13, 2009 | 2003 Audi A4 Cabriolet

2 Answers

Heater blows cold air


I had the same problem with the heater only working when accellerating. Found the overflow tank pick up tube was kinked. This of course made my coolant level low. So when the cars hot the coolant would push into the overflow, but when the car cooled the kink would prevent it from flowing back to the radiator.

Dec 05, 2008 | 2001 Mitsubishi Eclipse

2 Answers

Frequently loss the coolant and temperature increase. Heater blow cool air instead hot air


You are losing coolant if you have a coolant pressure tester follow the directions and use it. If you don't when the car is cool use a 50/50 solutuion of water and coolant fill system and check all the listed items carefully with a flash light and look for leaks. It is either a bad hose, cap, water pump or radiator. Your coolant circulates through the dash and the blower blows throught the heater core to produce heat. No coolant no heat. I would also check the passanger side floor for anti freeze or moisture could be a leaking heater core also.

Nov 02, 2008 | 1993 Toyota Camry V6

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