answersLogoWhite

0


Best Answer

The heater blend door is vacuum actuated. You have a vacuum leak somewhere.

User Avatar

Wiki User

6y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: 1999 ford 150.blows heat at start up then only blows cold except when going 55-60 mph then blows heat until slowing to 35-40 mph then cold again?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

On your 2001 Chevy blazer it takes 10 minutes driving before the defrost or heater blows hot air then when slowing down it starts to blow cold air and when taking off again it blows hot Any suggestion?

thermostat is stuck open.


Will they warn us if mount saint Helen's blows up again?

yes they will do what they can


How do you get the holy materia?

You don't. It falls into the water and isn't mentioned again until the end, where it blows meteor out of the sky.


Your ac stopped working and now blows out hot air what do you do to make it run cool again?

Call the repairman.


What could be wrong if all the lights work on the car except the tail and dash lights?

Blown fuse. If you replace the blown fuse and it blows again, you have a short in the tail light/dash light circuit. It's going to take some detective work to locate the source of the problem.


How does a land breeze form?

the cold breeze starts at land, when it is at sea it becomes warm. Then it blows back to land where it becomes cold again


Can you tackle them?

In FOOTBALL, you can tackle them any time you want! Well, except for when the whistle blows when the play ends or when a guy gets hurt... or when the game hasn't started yet.


How did Brian finally make a fire in Hatchet?

Brian realizes that he needs to blow on the fire. He uses the hatchet to create sparks and they land on the birch bark. He blows the bark, but his breath is too hard and blows it out. He tries again and the sparks grew into a small fire.


In a 2002 dodge stratus heat blows hot then it gose cold then hot again?

Check your coolant level, If low you need to find the leak.


What are the disadvantages of using fuses?

Once it blows, you will have to replace it before the circuit will work again. If you don't have a spare on hand then you'll have to get one as soon as possible.


98 ford Windstar heater blows cold at red lights and you get going heats up again?

Check your coolant level. It may be critically low.


What can cause the fuse for the dash and lights to blow as I changed the switch and it still does not work blows the fuse again?

you have a short in the wires for your dash and lights So what do I do to fix it?