Plugging an Outbreak of Leaks Audis with coolant drips and Nissans that shudder at moderate speeds are among the mechanical maladies covered in the latest technical service bulletins. The bulletins, which are compiled by alldatapro.com, offer automakers" insights into some recurring problems with various models. The bulletins, known as T.S.B."s, are not recalls; they are information provided by manufacturers to dealers" service departments and mechanics. Unless otherwise noted, the carmakers do not offer payment assistance for these repairs beyond normal warranty coverage. Alldata.com sells a more comprehensive version of the bulletins to consumers. Here are some recent examples: ACURA The front brakes of some 2013 MDX models may squeal when gently engaged. In T.S.B. 13-020 issued on April 13, Acura said the noise was caused by glazed brake pads. Replacing the pads and installing new pad return springs should result in quieter stops. AUDI A coolant leak in some models may mean a new water pump is in order. In T.S.B. 191336 issued on April 15, Audi said owners of 2009-13 A4, A5, Q5 and A6 models might notice leaks from the hose connecting the water pump to the heater core. Replacing the pump, hose and seal ring ought to stop the dripping. Also, owners of several Audi models may notice water pooling in xenon headlamp assemblies. In T.S.B. 941314 issued on April 5, Audi said the headlight adjustment screw or the bonding channel between the housing and the lens might let water enter. The problem affects some 2013 A4, S4, A5, S5 and RS5 models. Replacing the headlamp assembly will prevent further puddling. FORD Certain 2011-13 E-Series large vans may use excessive amounts of oil. In T.S.B. 13-6-9 issued on June 13, Ford said that consumption of more than a quart in 3,000 miles had been found on some vehicles with 5.4- or 6.8-liter V-8s. Removing the engine - yes, that's Ford's directive - and replacing the valve seals should stop the oil usage. GENERAL MOTORS Warranty coverage on the water pump shaft seals of several G.M. crossovers are being extended. In T.S.B. 13091 issued on May 20, G.M. said the seal might fail and cause coolant leaks, although the company said most of the failures were likely to have been caused by the coolant level dropping too low. The warranty is extended to 10 years or 120,000 miles, from five years or 100,000 miles, on 2007-10 GMC Acadias and Saturn Outlooks, 2008-10 Buick Enclaves and 2009-10 Chevrolet Traverses. Should the leak develop, a new water pump is in order. HONDA Some Civic models may be eligible for an extended warranty related to uneven rear tire wear. In T.S.B. 13-047 issued on June 14, Honda said the uneven tire wear on 2006-7 Civics and 2006-8 Civic Hybrids might be caused by incorrect rear suspension geometry. Repairs include new upper control arms. MAZDA Noisy front suspension struts may plague some CX-5 crossovers. In T.S.B. 0200513 issued on May 24, Mazda said the knocking or squeaking noise on 2013-14 models was caused by a damaged strut bearing. A new bearing will restore the silence. MINI In a service campaign, Mini has begun to replace coolant pumps in a variety of models produced in the summer of 2012. In T.S.B. M110113 issued on April 1, Mini said customers might notice a leak from the pump, which is caused by cracks in the plastic housing. The campaign affects vehicles built from June through August 2012 and involves Hardtop, Clubman, Convertible, Coupe, Roadster and Countryman models. NISSAN A shudder at moderate speeds could indicate problems in certain Altimas and Pathfinders. In T.S.B. 13-064A issued on June 13, Nissan said the shaking action in 2013 models with V-6 engines could be a sign that the torque converter was defective and needed to be replaced. The bulletin is limited to shudder occurring at 18 to 35 m.p.h. with light pressure on the accelerator. TOYOTA A whine from the rear differential at 50 to 60 m.p.h. may be heard by some owners of Tacoma pickups. In T.S.B. 005713 issued on April 26, Toyota said the noise could occur in 2005-13 models with the 5-speed automatic transmission that were not equipped with limited-slip or locking rear differentials. Replacement of the differential is the cure.