Q: AC system

asked by on July 18, 2016

On this 1998 Ford F150 the engine has been rebuilt so the miles that it says on here are the frame miles. On the truck there was a weird sound as if something was rattling, so I looked in the engine compartment and the AC clutch was bad. I replaced the AC clutch and when I turned the truck on and turned the AC on, the clutch continually moves. But once I turn off the air-conditioner (with the truck still running) the AC clutch disengages. I hooked an AC manifold gage to the high side and low side. The low side said 40 and the high side said 30. The truck blows cold but the gage reading does not make sense to me unless it's the expansion valve. Should I just evacuate the system and put new freon in? The truck does not have r24 the truck has r134. Ultimately, what should I do?

My car has 386 miles.
My car has an automatic transmission.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Can a running AC harm the car while parked
No, not as long as your cooling fans are working. Cars are made to run all day long with the AC on (https://www.yourmechanic.com/article/4-essential-things-you-should-know-about-the-heating-and-air-conditioning-system-in-your-car). If they have the cooling fan working, sucking air over the radiator into the AC condenser. It...
ESC Off light came on and continued showing
This light is indicating a logged fault in the stability control system on your 2009 Kia Rondo. Common issues are generally wheel speed sensor failures (https://www.yourmechanic.com/services/wheel-speed-sensor-replacement), but this can be determined by having the faults read out of the ESC...
Overheating, leaking, and starting issue
I think you meant to say that the engine's cooling system is leaking, rather than the AC system. Without testing the cooling system, there is no way to tell where the leaks are. The hard starting (https://www.yourmechanic.com/services/car-is-hard-to-start-inspection) may not be...
Running hot with water leaking
Hello, thanks for writing in about your Ford Expedition. From what you've described you may have dual heat on your vehicle and the rear heater core or one of the lines is leaking. It's also possible that your control valve...
Change timing belt now or later
Hey there. The timing belt is designed to last a long time and most vehicles recommend replacement between 60,000 to 120,000 miles. If your vehicle recommends a replacement interval of 90,000 miles then you should have it done at or...
I got a new battery new alternator put in but my battery just gets drained I keep having to buy new batterys
This may be a sign of a failing voltage regulator or potentially a bad grounding problem causing a draw on the system. The voltage regulator is a unit that regulates the charging of the battery by the alternator. Often times...
Leaking coolant out of radiator drain tube
If you are referencing to the radiator drain tube then you need to check to make sure the radiator drain valve is in the closed position. If the drain valve to the radiator is closed and still leaking then try...
How much would it cost to replace front brake pads on 2011 mercedes glk 350?
Hi There, The majority of brake pads (https://www.yourmechanic.com/services/brake-pads-replacement) on most cars start out with about 12 mm of material on them. You should definitely replace them by the time they get down to 3-4 mm of material and certainly at...

Related articles

A Buyer’s Guide to the 2012 Ford Fusion
Choosing Choosing a mid-size sedan for your family can be a tough call. There’s a lot of competition out there, including really popular models like the Honda Accord and Toyota Camry. Among all those, though, the 2012 Ford Fusion really...
A Buyer’s Guide to the 2012 Ford Expedition
The The 2012 Ford Expedition has ample room for passengers and cargo, while still being able to tow anywhere from 8,900 to 9,200 pounds. The Expedition has two-tone exterior packages making it stand out against its competitors. Along with that,...
The Best Used Cars to Buy If You're a Doctor Who Makes House Calls
If If you are a doctor who makes house calls, reliability is likely to be at the forefront of your mind when it comes to choosing a used car. You also expect a certain level of comfort. We have evaluated...