violent rumble under driver side hood. comes and goes even at idle. no fluid on ground below, but small amount on transmission case. My wife barely made it home from shopping on hot day.
Country: United StatesMake: VolvoModel: S-40Year: 2003
listened under hood. hoses jump up and down, cant see much. Intermittent can last for 30 seconds or more.
Hello, I will try to help. This is most likely a water pump bearing that is failing, or a CVVT camshaft hub failing. The variable valve timing camshaft hub has a series of vanes and springs that operate under engine oil pressure to advance or retard the cam timing. When that hub gets worn, it starts growling and making all kinds of racket. BOTH of these failures WILL result in bent valves if they come completely apart. This is very important. I WOULD NOT drive that vehicle anymore, I would have it towed, because if that water pump or hub comes completely apart and the timing belt that turns them jumps or breaks, The pistons will hit the valves and the head will have to come off to be rebuilt, or a replacing engine will have to be installed. I wouldn't risk it.
I've had 10 years of experience on the car line at 2 Volvo dealerships, Quality level Volvo tech.
I will make a statement. The problem was inermittent, violent and difficult to identify. My wife's 2003 Volvo s-40 had gone through doing a rear ender on a pickup truck. My wife had dozed. Maaco Body shop made it look like new, and it drove beautifully for about a month. My wife came home with this violent rumble. I had it towed to the mechanic who worked 2 weeks on and off trying to find the problem. The problem was the impact from the accident apparently unsealed the locktite on the bolts hling the torque converter to the tranny. In addition the plastic cage holding the radiator fan had a fracture that was not replaced by Maaco and the fan wilth all the viotlen rumbllng gouged the radiator and it was leaking. So the fans and radiator had to be replaced. The bolts on the torque converter were generously locktited and the car is like new now. None of this followed your advice.
Country: United StatesMake: VolvoModel: V70 2002 turboEngine: the bigger one of 2 ?L Already Tried: My V70 got a new top of the line Sears Die Hard European Battery $145. Once a month the charge goes to barely 12 volts and the car will not start until I get a jumper from another car. After that it will chage to 12.6 volts and act normal for another month. Then it happens again. I quickly made a voltage reading at the front then at the battery and unless I miss read, they were different. The car had a 4 amp charger on it. The Battery was at 12V and the front jumper connections were at 13V+.???
OK, I wasn't aware this vehicle was in an accident, The cooling fan assembly being lose or broken would certainly make a loud rattling noise. But, of course it should have been repaired by Maaco. There is no way in my opinion that an impact could break tourque convertor bolts loose. As the bolts are hidden behind the bellhousing and engine block. If the transmission has ever been out, then they weren't tourqued tight enough on reinstallation.
No Problem, I am not criticizing you. It is fixed now.
It's possible you could have a battery draw or parasitic drain on the battery. you can disconnect the neg. cable off the neg. post on the battery and hook a test light between the two. If the test light glows bright, you have a draw. test light should be very dim. Make sure all the inerior lights, console lights trunk lights. every light is out. Check the alternator output voltage when the vehicle is running by putting a voltmeter across the battery. should read around 14 volts. Also, on a battery load test, on a 12 volt battery, battery shouldn't drop below 9 volts when cranking engine. let me know what you find there.Edward Clayton41136.7615707176