Ford F-150 - 1997-2003 :: Heater Blows Cool Air
Dec 2, 2012
I took the dive into a new heater core, as the heater was not getting hot. These are the things I did while on my adventure.
1. Before reinstalling the hoses, I blew thru them to make sure of no clogs...water flew out the other hose..no problem..no clog.
2. inspected mix door not cracked or broken...no problem
3.actuator opens and closes ok, I assume, I can hear the motor run and the door thump closed...no problem
4. water and anti freeze level good....no problem
Start vehicle,let warm up, turn on heat.....No Heat...
5. check hoses at core, one is hot ,the other is not....Problem...
1997 f150 4x4 ...
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So my heater works when I'm rolling down the highway. When I'm at about 20 mph or less it blows cool air. Also when it's just idling it blows cool air. What I might have an issue with?
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1998 F150 step side, 4.6 V-8 automatic, 176,000 miles -
Heater begins to blow heat as the engine warms up - heat gauge moves up to normal level - running at speed, suddenly the heater blows all cold, the heat gauge pegs to total hot - the oil light comes on, the engine begins to miss - stop the truck, shut off the motor, wait 10 seconds, start back up and all is normal and away I go. Heater working just fine. Gauges are just fine. Have checked the hoses when it pegged to hot, and they are just warm just as if everything is normal.
Problem is intermittent.
Have changed radiator reservoir cap, thermostat, made sure fluid level and mixture is correct - what else to check? Computer issue?
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I have a 2003 Ford f150 5.4. Heater blows hot, then cold, then hot then cold. When it start blowing cold it pukes out the degas bottle. I have burped it, did the combustion test to make sure not a blown head gasket, the oil clean, there is moisture coming out tail pipe but it has no coolant in it. flushed heater core, pulled water pump off and checked it, its good. Changed thermostat 2 times, put front on ramps to get any air out. I am at a total loss now.
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My wife drives a 2010 Hyundai Elantra with a 5 speed manual trans with about 40K mi on it . We purchased the service maintenance package that covers all scheduled major and regular maintenance. A year ago they replaced the head gasket because they discovered a small oil seep. This was covered by the warranty.
Well a couple of weeks ago I noticed that the heat is fine on the drivers side and blows cool on the passenger side. This is a problem particularly when defrosting the windshield. When she brought it in for the next scheduled service a couple of days ago I asked that she mention this problem to the service people.
Their response was "we need to do a cooling system flush which would not be covered by the service contract" to the tune of a couple a hundred bucks. The coolant is the transparent green it should be due to it being changed one year ago so I have my doubts about it being the heater core.
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I have a 1997 ford f 150 lariat with the 4.6 v8 and my engine had a piston slap so I replaced the engine with a used one and I put a new water pump on the engine. My problem is the heater does not get hot and it only gets warm when I get on the freeway and the rpms stay steady for a bit. but when i idle it just blows cool air. the heat door works cause I can turn it to cold air when I'm on the freeway and i just replaced the thermostat so I don't believe its that. It weird because the heater worked fine before I changed out the engine so i cant figure it out. the only thing i can think of is the water pump is bad out of the box. Could it be the belt or does spacing on the water pump have something to do with it. nothing is leaking.
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A friend has a 2003 F150 that after starting up will run hot but blow cold air when the heater is on. The truck will run hot for ~ 5seconds then all of a sudden the temp drops to normal range and the heater begins to blow hot. Simultaneously, the oil pressure light comes on when the truck runs hot, then falls to the normal range when the temp drops. I thought perhaps the thermostat is in backward.
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I just bought a 1997 Toyota Tercel 5-speed stick, with 175,000 miles, and the temperature gauge moves from its lowest possible position to its highest possible position when the key is turned on, although the engine does not overheat, and no coolant is leaking or being burned. I replaced the coolant temperature sensor, but the actions of the gauge were not affected. I don't know if it is somehow related, but the heater blows cold, regardless the setting of the temperature dial on the dash. What I might try next?
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My 94 is on the mend , since I got it a few months ago. The air conditioner blows cool , just not cold . It's still a R12 system, and I got the fittings/R134a/oil charge/and mineral spirits to do the change over, but hesitated when I found someone locally had a few cans of R12 for sale . My thought is to buy 1 can , and see if a shot would make the difference before going through the procedure to flush the 12 out and go with the 134a .
My biggest problem is lack of a gauge set , but a guy from CraigsList here says he walk me through the change over for 60 , and betting he'd have the hoses for a 12 system to hit that if that's how I decide to try first. I just wonder why , since I got it , the "cool" it does blow hasn't changed so I am betting it isn't leaking , but the jackleg I got it from was one that IMHO wouldn't know how to open the hood , or what to leave alone, I am just at that point of impasse, as to which way to go ...
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I took my truck to a friends express lube to have some freon added to it. My truck has been blowing cool air, not cold. So i thought it might be low on freon considering its a 2000 f-150 w/ 145,000 miles. He took a pressure gauge to it and said it is over charged, the pressure was high.
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I went to walmart and let the engine run for a while and shut it off. It would not start until it cools off. Now that its cool it starts fine. It just started doing it. Come to think of it i did get some gas in it.
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When I turn on the heater on at any temp and fan setting the A/C automatically turns on (compressor and condensor fan turns on) . Engine temp comes up and stays at 190. I can turn up the heat to HI and still cold air blows. All buttons and LEDs work on the climatronic, is it the climatronic that is bad?
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My 2003 Buick Century heater works fine while accelerating but as soon as I release the gas the air begins to cool, swiftly. I have had the radiator flushed and the coolant topped off but the problem persists.
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1) no cool air at all from AC
2) low pressure side shows 0 even after adding some refrigerant
3) ac compressor engages. I can hear a slight load on the motor when I push the ac button
4) when pressing the ac button the fans don't automatically come on. They should come on right
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I need to diagnose a heat problem. I have a 2001 F150 XL. 4.2L Manual controls. The a/c blows nice and cold, but when you put the heat on its not really hot, blows warm air. I changed the blend door actuator,it got a little warmer. Now that winter is around the corner need to figure it out and fix it. The thermostat, water pump, and coolant flushed before I bought it. Could it be the blend door itself, or is there another actuator I'm missing.
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When going down the road, the air blows threw the defrost and on the down hill it comes back to the vent.
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My 1999 F250 ld light duty has an AC problem. It only blows cold sometimes. And it doesn't always work when selected to AC or Max AC. It will work on Panel also. When it works it works great. It blows really cold. But it will work fine then I'll come to a stoplight and it will stop sometimes.
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I have an '08 350 with less than 82K miles. My problem is the AC. The vents on the passenger side blow out cool air and all the vents on the driver's side blow out hot air. Even the vents in the backseat, the left one blows hot air and the right one blows cool (my son informed me of this as I hadn't even checked). As you can imagine it's very uncomfortable driving around in this CA heat every day, especially since the driver side vent in the center cannot be completely closed. What could cause this?
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I have a 2004 Buick Century with about 48,000 miles on it..the A/C blows very cool but not cold,it should be colder..i also have a 2003 century that blows icy cold.. I hooked up a cheap gauge to the low side service port on both vehicles and got about the same reading. Other then being slightly low on refrigerant is their anything else that would cause the A/C to blow cool air rather then icy cold? The compressors seem to kick on the same on both vehicles. I really don't want to add refrigerant if it's not low...
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I have an '02 Durango, and the AC only blows cool air when going down the road at 25+ mph. I thought I'd try putting some refrigerant in, but when I hooked up the gauge on the can it buried the needle, so it's over 100 psi on the low side, and the pressure was high enough that no refrigerant would flow in. Up where the lines attach to the expansion valve, when idling the in line is HOT - like too hot to keep your hand on and the out line is about air temp. The guy at the parts store thought the expansion valve was bad. As stated, AC works okay (but not excellently) while going down the road.
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I've read that this is a somewhat common problem but can't find the part number to what I need. My heat stopped working and won't change blowing any temp only blows slightly chilled air. I found that its suppose to be a part in the dash that controls this thru the climatronic head unit some lever that isn't getting pushed over correctly dew to a worn out part. What part I need to get my heat back working.
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