Question about 1999 Ford F150 Regular Cab

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1999 ford f150 , after engine warms up , heater only blows warm air

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Check the hoses to the heater core and make sure they aren't deteriorated. Also, it might be worthwhile to clean and flush the cooling system.

It's possible there is a problem in the controls for the air conditioning system, too. The various valves in the ducts are vacuum controlled, and if a leak develops, it's possible that cold air is being mixed with the heated air.

Posted on Dec 03, 2010

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Heater will not blow hot air, on 1990. Ford F150 5.0


Check the temp. gauge...........is the engine reaching running temp.?
Is the radiator full? The overflow tank at proper level?
No warm air in defrost?
Could be a bad blend door motor(vacuum or electric,probably vacuum).
don-ohio (:^)

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My 2010 F150 Lariat. The heater blows warm air on driver side but blows cold air on passenger side. What could be the problem?


Does it have dual zone climate? If so, you have to adjust the passenger side. If it still doesn't work, check for vacuum hose off in engine compartment, going into the firewall.

Dec 03, 2016 | 2010 Ford F-150

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My heater is blowing cold air when the vehicle is stopped, still blows warm air when car is in motion.


hi there it sounds like the matrix has gone it is at the back of the centre panel at the bottom when the engine is hot touch the matrix to see if its warm

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1 Answer

I have a 2000 f-150 and my heater blows warm air but does not get real hot.It seams that the colder it is outside the less effective my heater is,what could the problem be?


Did you happen to check the t-stat or the engine temp gauge, to see if the engine is getting warm ?

Most will past this check, and go right to a blend door replacement ( which is time consuming ).

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1 Answer

1999 ford taurus se 155thousand miles, 3.0 V6


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4.6 liter has one heater hose warmer than the other. may be plugged core,or is ther a fuse to climate control switch?


Look for a heater valve on one of the hoses if there is no valve i would say its a plugged heater core.

Dec 11, 2009 | 1999 Ford F150 Regular Cab

2 Answers

Engine won't warm up. heater won't blow warm air.


maybe it is missing its thermostat.... this can keep the air in your heater cool in winter

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Several problems with 99 Ford F150


The AC/Heater blend door temperature control actuator electric motor is most likely defective, very common problem,

May 07, 2009 | 1999 Ford F150 Regular Cab

1 Answer

No heat just warm air


I think you are on top of your problem,,you dont need any one elses advice.
Complete rebuild of the cooling and heating system,, simple.

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3 Answers

My 1999 Ford F150 Heater only blows out cold air


guys have you checked for a vaccum leak????? there is a little plastic ball with a vaccum line going to it that controls the outside air coming in. check for a leak in this line

Dec 10, 2008 | 2001 Ford F150 Styleside SuperCrew

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