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98 dodge 4x4 1500 when heater fan is on high it blows colder air didnot do this till had heater core replaced and in ac mode when giving a lot of gas like to pass ac air jumps up to defoster let off of gas go back to dash vents why

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Sounds like they mis-connected the vacuum hoses to the control unit. passing causes vacuum to change.

Posted on Dec 09, 2014

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Posted on Jan 02, 2017

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Truck doesn't heat while idling


Could be low on antifreeze. The heater core is the highest spot in the cooling system and it may develop an air pocket. Another possibility is the thermostat is stuck partially open and doesn't let the engine warm correctly, watch your temp gauge on the dash and see if it comes up to the middle like it should while idling. If it doesn't, it may need replacement.

Oct 19, 2014 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

Heater is blowing cold air.


fix coolant leak where hose or tube goes from overflow jug to the radiator cap and replace radiator or overflow jug pressure cap see what happens.if problem still exist your blend air door stuck or air door vacuum or electrical actuator not working not receiving vacuum could have broken vacuum hose or faulty mode switch, could be many things.could have plugged heater core check both heater core coolant hoses both hoses should be hot.if heater core inlet hose hot and out let hose cold heater core could be clogged need flushing out.

Jan 05, 2012 | 2001 Dodge Durango

1 Answer

My heater will not come on ? well it will blow out and but its just cold air. but i looked at the fuses for the heater and its still good and not busted or burnt out.


the heater core does not have a fuse, it is passive. most likely it needs to be replaced. a good fan blowing over a cold core will not give you warm air. you need a hot core.

Feb 03, 2011 | 2004 Dodge Neon

1 Answer

Took 2000 dodge intrepid 3.2 engine to shop. NO heat. they sd it was the ac/heat control panel. they replaced it, when i picked my car up, still no heat. went and got another part from junk yard, now will...


the fact that after you changed the part from the junk yard it blew warm air indicates that the heater core is not the problem
could be the heater control is not fully opening or the junk yard replacement part is faulty

Jun 17, 2017 | 2000 Dodge Intrepid

3 Answers

99 SAAB 9-5 PROBLEM WITH AC....AC IS WORKING.. CONDENSING WITH NO PROBLEMS ...WATER RUNNING OUT UNDER CAR..PRESSURES ARE 225 HI 35 LOW... NOT GETTING COLD AIR INSIDE...LUKE WARM ON DRIVERS, AND COOLER...


OK, most cars have heater cores that get hot but the blender door directs air away from this core in the a/c mode when you want cool air from the evaporator.

I'm not sure if there is a control valve which stops the water from going through the heater valve.

I think the part is called a 'heater blend door actuator' that you are after.
http://www.autoanything.com/air-conditioning-65-861/201A1060.aspx?kc=AFFCJ&mr:referralID=c9ca506d-9f22-11df-bf8d-0026b95a1738


Aug 03, 2010 | 1999 Saab 9-5

1 Answer

Rear a/c heat vent do not work


Sounds like the flapper valve for the rear heater/AC core is not doing its job to send the air through the AC core when called for.

Another clue of this is the fact that the air is coming out on the lower vents when it should be up high fro AC.

Have someone listen back by the fan inlet in the back usually on the right while you switch between AC and heat to see if they hear any noise or change in air flow.

Worst case is that the interior panel there has to be removed to service the assembly behind it.


Jul 06, 2010 | 2000 Dodge Caravan

1 Answer

Heater blowes cold air replaced heater controls and all vales are working the heater core gets hot on both sides so how do i fix this


It seems to me if your heater core is hot, and the fan blows cold air, then your ducting is closed off. Try and see if your duct door is opening up. You say you changed out your controls, but it sounds as though it wasn't your controls that were bad, but what they control is not opening up.
It's all well and good that the heater core is getting hot, but if the fan cannot deliver that hot air passing through it, then walah.
It has to be an air duct obstruction. Either the ducting is collapsed, the duct door is not opening, or you have some obstruction blocking the ducting. My guess, because that is all I can give you without seeing for myself, is that the linkeage or solonoid that opens the duct door is not working. Older cars had a cable, but I believe newer use a solonoid to operate the opening and closing of the door. The door is there so you don't get the heat from the core when you are using AC.
Hope this helps.

Sep 11, 2009 | Dodge Pickup Cars & Trucks

1 Answer

My heat blows hot for about 5secs then grt cold again whats that


If there is no sign of coolant loss (air pocket in heater core),then check for plugged heater core. Both hoses should be very close to same temp with engine at operating temperature with heater fan on high setting.If the return hose is alot colder, then coolant flow is restricted.

Jan 31, 2009 | 1999 Ford Expedition

1 Answer

Blend Door on 98 Ford Explorer


the blend door is roughly in the middle of air distribution Plenum assembly between the heater core and the AC evap core, it either directs air through the heater core or the AC evap core or mixes air from both.

Jan 14, 2009 | 1998 Ford Explorer

1 Answer

Low heat coming from heater


heater core may be clogged. disconnect the hoses. CUT THEM OFF THE HEATER CORE!!!! If you pull them you may damage the solder joints at the tubes causing a leak. Them connect a garden hose and flush one way then another till water runs clear.

Nov 17, 2008 | 1995 Dodge Dakota

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