Monday, December 22, 2014

When Heat Fails Us

This is the time of year when we depend on heat in our cars.  For most of us, the heat delivers on its design promise.  For a few unfortunates, though, it doesn’t.  The mechanic checks the coolant level, and makes sure the thermostat is working as it should.  If the engine is up to temperature the next place to look is the heater control circuitry.  When all else fails we are left with the possibility that the heater core itself has failed.

Heater core replacement is the automotive equivalent of a root canal.  It's ugly, painful, and costly but sometimes it has to be done.

Heater cores are like small radiators that shed some of the engine’s heat into the passenger compartment.  There are two ways a heater core can fail – by leaking or by clogging.  Leaks are obvious because you’ve got coolant all over the floor.  Clogged cores are more subtle.



Take a look at this core from a 2006 Land Rover LR3.  There’s nothing obviously wrong from outside, but when we cut the core open we saw a different story.  The whole far side of the core is clogged.  Only the left side of the core remains open.




You might think that would cause weak heat, but it actually created a different problem. This Land Rover – like many other late model cars – has separate temperature controls for the driver and passenger.  The air that blows through the core is sent to the left and right sides respectively, so with one side clogged we had normal heat on the passenger side, and virtually no heat for the driver.

This seemed like a control problem but it wasn’t.  When heater cores clog the repair is often a big deal.  In this Land Rover the whole dash had to come out for repair, as you see.  Jobs like this can run into multiple days of labor, and cost thousands of dollars.  And this is no place to cut corners looking for a low bid – this is detailed work.  Every fastener left loose, and every broken bracket is a potential rattle.  There are a hundred electrical connections, and any that come loose are problems for tomorrow.  This is work for someone who knows Rovers and specializes in large interior repairs.




When a job like this is done there will be faults in the airbag system and many other dash electronic systems.  The person who does the work will need to have a factory-level test system to clear those faults and ensure everything is working as it should.




 At Robison Service we are proud to be known as experts in repairs like this.  Author John Robison is a long time Land Rover service manager, and a technical advisor to many Rover clubs.  He’s written many articles on Land Rover service – indexed here.

No Land Rovers were harmed in the writing of this story, and environmentally friendly repair methods were used throughout.  We are located in Springfield, Massachusetts, where we stand ready to provide top-quality service and repair to owners of BMW, Jaguar, Land Rover, Mercedes-Benz, Porsche, and Rolls-Royce and Bentley motorcars.


© J E Robison Service

Wednesday, December 3, 2014

An Index to John Robison's Land Rover Service Thoughts


The Supercharged Range Rover (c) J E Robison Service



The ex-Buick V8 that Land Rover sold in America from 1987-2004 was never known for its reliability.  However, things took a sharp turn for the worse in 2002, and the last Discovery engines appear to have been doomed from the start.  Here are three articles about internal problems in the V8s:

V8 engine failures - slipped liners and more - from 2009

Should you rebuild a failed Land Rover motor? I have an article about that situation here that covers the decision process

What's the latest on top hat or flanged liners? This article tells all you want to know about the flanged liner overhaul

Discovery II models also have a problem with frame rust.  We first began to see this in the spring of 2014, when we saw several trucks whose rear frames rusted right through over the winter.  These vehicles seemed more vulnerable to rust than the earlier models.  Read this article to find out why, and what you can do about it.

Are you thinking of restoring a Land Rover?  This article shows some of what's involved.  This article explains the difference between repair and restoration, two very different processes.

If you drive a Range Rover Sport or LR3, read this story on differential failures

And if your supercharged Rover is losing power - read this

Programming keys for your Land Rover is here

(c) J E Robison Service

John Elder Robison is the founder of J E Robison Service, independent Land Rover specialists in Springfield, MA.  John's shop has supported Land Rover owners since 1987. They are experienced at all aspects of service, repair, overhaul and restoration.  Find Robison Service online at www.robisonservice.com or on the phone at 413-785-1665.