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Old 05-25-2011, 14:54   #1 (permalink)
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98 f150 4.6 AC/Heater problem

For the past few years the AC/Heater has been acting wierd. When i am at idle or kinda just cruising at one steady RPM the air blows out of the vent just fine, but when i give it any kind of gas the air stops going to the vents and switches to the defrosting vent on the dash. Im not to sure what it could really be

The last owner I believe put a new climate control unit in, but that didnt seem to work.

Could this maybe be a bad blower motor or something with the wiring?

I also noticed there is a hose on the passanger side of the ending bay on the firewall that goes into the truck and is connected to one of the A/C lines is very loose. I kind of traced it to where it goes which looks like the blower motor but i have no idea since im not experianced in AC/Heater parts.

Any help would be greatly appreciated

Thanks
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Old 05-25-2011, 14:59   #2 (permalink)
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Re: 98 f150 4.6 AC/Heater problem

That would be a vacuum problem. The check valve, reservoir or lines are leaking. Usually it's the lines, check valve or reservoir under the hood.
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Old 05-25-2011, 15:24   #3 (permalink)
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Re: 98 f150 4.6 AC/Heater problem

ok cool

as far as the lines, you mean all the vacuum lines, what would be the easiest way to check for the leaks? Carb cleaner, starting fluid or something else?

also where is the check valve located?
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Old 05-25-2011, 15:26   #4 (permalink)
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Re: 98 f150 4.6 AC/Heater problem

ok cool

as far as the lines, you mean all the vacuum lines, what would be the easiest way to check for the leaks? Carb cleaner, starting fluid or something else?

also where is the check valve located? and is there a way to test it
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Old 05-25-2011, 17:37   #5 (permalink)
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Re: 98 f150 4.6 AC/Heater problem

I don't have access to that ibformation, but you can follow the line that goes inside. Followthe line back toward the engine. You'll see it tee off, one goes to the engine and the other to the reservoir. Look for a break in the line and check the reservoir and check valve.
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