Question about 1998 Chevrolet S-10 Pickup

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My 1998 S10 Chevy pick up heater only heats when I hold the gas pedal to the floor. When I let off the gas it slowly starts blowing cold air again. what is your thoughts on this problem?

Over the last two years I've had the radiator replaced and thermostat installed. Has V6 Vortec egine

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Sounds like a clogged heater core. You may be able to disconect the heater hoses and back flush it with waterhose. Without draining all the coolant from the engine just put a good dized pan under the hoses and push length of hose on both inlet and outlet ru inlet to pan then blowing in the other to recover coolant from core and give some idea if its clogged.
Cars used to. Have a vale to stop the flow to the core but not so much any more.
You may have a bad water pump.
On on of mine the impeller blades had completely corroded or eroded away and it moved no hot water at all
Worst case senario:
New pump, heater core, coolant, check freeze plugs for rusting through and hoses as well as flushing tge blocks waterjacket for rusty debris that will plug up the core again and erode a new impeller.

Posted on Dec 22, 2016

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Sounds like you have a restriction in the heater core. You can try removing the heater hoses at the firewall and putting a garden hose to the bottom inlet to reverse flush the core, if this is unsuccessful you will probably need to have the core replaced.

Posted on Dec 22, 2016

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1 Answer

My air only blows through the defrost and floor vents 1998 Ford F-150


To troubleshoot this types of problem,click the link below :----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the issue.

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Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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This will help.Thanks.

Feb 19, 2012 | 1997 Dodge Dakota

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1998 Tercel Cold heat to the windshield. Lukewarm out front vent.


Hey,

I just replaced my thermostat in my car due to the same problem. Except mine was a 92. I figured I'd start with the thermostat and antifreeze. Then the heating core. Now I have heat.

But yet I still have no heat on the windshield.

Oct 23, 2009 | Toyota Tercel Cars & Trucks

1 Answer

No heat air is blowing cold


First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest to flush the heater core.

Oct 22, 2009 | 1998 Ford Taurus

1 Answer

1998 Chevy S10 pickup air condition compres is on instead of heat


First be sure that you do not have the controls set to defrost the windows since on just about all vehicles nowadays with the controls set that way the air conditioner will be turned on...even if it is not so warm outside. So...be sure that you do not have any of the controls set to defrost and that the heater is turned all the way on.

It sounds like though that the control for the vents is not operating properly. This is a combination of mechanical movements of the vent flaps and small "air motors" that operate the flaps. These air units are controlled by air vacuum taken from the engine compartment through tiny hoses. If the hoses get cracks, holes or come loose from their fittings then your vents will not move correctly so it is a matter of looking and tracing each one of the hoses to make sure they are fastened correctly, have not come loose and are not cracked or leaking. The problem can even be in the engine compartment where the hose(s) connect to the engine vacuum system...so it will take lots of looking carefully with flashlights etc....good luck.

Aug 21, 2009 | 1998 Chevrolet S-10 Pickup

2 Answers

Heater 1998 chevy s10


You need to check your coolant level first. If it is low you have a coolant leak. No hot coolant=No heat

Jun 22, 2009 | 1998 Chevrolet S-10 Pickup

1 Answer

Heat wont blow through heater or defroster vents


common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Jan 18, 2009 | 1997 Chevrolet K1500

1 Answer

1996 chevy s10 heater not blowing hot air


heater core or leak on cooling system

Jan 06, 2009 | 1996 Chevrolet S-10 Pickup

2 Answers

Heater control 98 chevy s10 blazer


These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.

Dec 13, 2008 | 1996 Chevrolet Blazer

2 Answers

1998 buick park avenue drivers side blows cold, passenger side hot


sounds like the drivers temp door actuator is not working should be located on the drivers side of the air box down by the gas pedal or center dash area

Oct 03, 2008 | 1998 Buick Park Avenue

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