Question about 1987 Chevrolet S-10 Pickup

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Heater problem I have a 1998 S-10. I get heat for the windshield but when I put control to vent position I just get cold air.

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You have a vacume leak

Posted on Jan 11, 2009

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As i described a few minutes ago about a 1992 olds cutluss 3.1 v6. System has been bled. new thermostat also...both hoses upper and lower are hot....circulation is good but only blows cold air


I need more info. When you set the vent control to defrost does it direct the air to the windshield. and when you set it to floor does it go there. if yes the control to divert air is working. before replacing the control unit you need to find the lines that feed hot water to the heater and check to see if line coming in to the heater is hot and the line returning from the heater is warm to hot. sometime the heater gets plug. if so just disconnect the lines to the heater and flow water from your garden hose to the return line of the heater for about a minute or so this will flush dirt from the heater. reattach the lines and check for heat. This is a known problem for all cars as they get old.

Apr 10, 2014 | 2003 Mercury Grand Marquis

1 Answer

Why my air condition blow cold air even when its not on


It blows cold air with the mode selector in what position. If it is on defrost and you have the temp adjusted to full heat than the a/c will be on to dry the air before it hits the windshield, this helps to remove the fog from the windows. If there is no heat coming out the vents than you need to check to make sure the blend door is working. You should hear a distinctly different sound out the vents when you turn the heat from full cold to full hot. Also check to see if the heater core is plugged. With the engine warm you should be able to feel little difference in the temp of the two hoses that go to the heater core. If one is hot and one is cool than there is a flow issue. Either the water control valve is bad, it is not being opened by the HVAC control head, the is a vacuum leak to the control valve or the heater core is plugged. Your vehicle may or may not have a valve that controls the flow of hot water to the heater core.

Sep 08, 2013 | Ford Ranger Cars & Trucks

2 Answers

Heater blowing out cold air


Several things.
If the heater hoses are hot, the problem could be a blend door under the dash. The blend doors direct air thru the heater core and out the vents.

Jan 24, 2013 | 2005 Dodge Caravan

1 Answer

I have a 1991 camaro.The air or heat doesn't come out through the front vent when switch to vent control.It only come out through the dashboard to defrost the windshield..I have bought and install a...


It is the vent control. It is located on the passenger side behind the dash. It is vacuum controlled. It can fail and not let you change the vent positions.

Good Luck!

May 09, 2011 | Chevrolet Camaro Cars & Trucks

1 Answer

Air/heat front vents not working


Center vents only open for A/C or cold air. If you turn to full cold then the pod that controls that door has gone bad or the dial has it closed off.

Jul 14, 2010 | 1994 Mercedes-Benz C-Class

1 Answer

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

A/C only from center vent. Heat from side vents and floor vents.


sounds like the blend motor from hot to cold is stuck open half way allowing both temps to come into the car.

Aug 24, 2009 | 2003 Jaguar S-Type

1 Answer

No heat - ac stays on blowing through defrost vents


If you have the heater directed to the windshield, the AC will turn on. Move the control away from defrost.

Feb 01, 2009 | 1998 Ford Windstar

1 Answer

Front panel temperature control switch


Very likely the blend door is broken. This door is mounted beside the heater core, blends cool air with hot depending on the position of the door. At the bottom of the door at the hinge point, there is a gear and coupling driven by an electric motor to position the door. The coupling is a drive much like a square drive ratchet and socket made of plastic and often cracks allowing the drive to turn without changing the door position. I've heard you can drill through the outer housing and put a screw in the door through the drive gear, but you would have to know your way around this area well.
I repaired mine by replacing the blend door, a big job at best. The entire dashboard must come out to access the top of the heater core housing which must be removed.

Oct 02, 2008 | 1998 Ford Expedition

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