Post by Deleted on Oct 30, 2019 1:06:56 GMT 1
Been talking about these over some time and the consensus from garage staff at this time seems to be that they think they will be retired before these vehicles start rolling through the doors for repairs!
Well I've seen a few now for mot testing and they are getting quite old to be honest. Today we had a Plug - In hybrid with a customer complaint of heater blowing cold all the time. Funny thing is that I'm the one in the garage who gets back stabbed and undermined all the time but when a job rolls through the door like this one I always end up with the job! I wonder why that is?
As I pointed out previously I have only just started training on these types of vehicles. This one today, a Mitsubishi Outlander I am not familiar with at all, hence I did a visual inspection around the cooling system components and what I have learned to date is this. The heater matrix hoses and tubes travel along the floor panels to the rear of the passenger compartment, which must be for rear passengers heating. The hoses from the front matrix has one hot and one cold, following these hoses to the rear one is hot and the other is cold. The engine top radiator hose is hot but the lower radiator hose is cold, sounds like a thermostat I hear you saying?
My research to date not from the Mitsubishi but from my training material now understands that the ACC systems fitted to hybrids have their own cooling system comprising of a auxiliary heater and a circulation pump, kind of like a water pump on an engine, a heat exchanger and a PTC heater. Incorporated into this heating circuit are some valves and inside these valves are filters which can become blocked with sediment over time, hence the coolant flow becomes restricted and some hoses become hot and some become cold. You'd be forgiven for believing the coolant pump (electric) had failed due to the variations in temperature, however the filters would be my first port of call as a diagnosis here! The Mitsubishi was then past over to our other guy for a full service where I was told that the heater problem is coming back in another day. I wonder then who will get the credit for that diagnosis?
Well I've seen a few now for mot testing and they are getting quite old to be honest. Today we had a Plug - In hybrid with a customer complaint of heater blowing cold all the time. Funny thing is that I'm the one in the garage who gets back stabbed and undermined all the time but when a job rolls through the door like this one I always end up with the job! I wonder why that is?
As I pointed out previously I have only just started training on these types of vehicles. This one today, a Mitsubishi Outlander I am not familiar with at all, hence I did a visual inspection around the cooling system components and what I have learned to date is this. The heater matrix hoses and tubes travel along the floor panels to the rear of the passenger compartment, which must be for rear passengers heating. The hoses from the front matrix has one hot and one cold, following these hoses to the rear one is hot and the other is cold. The engine top radiator hose is hot but the lower radiator hose is cold, sounds like a thermostat I hear you saying?
My research to date not from the Mitsubishi but from my training material now understands that the ACC systems fitted to hybrids have their own cooling system comprising of a auxiliary heater and a circulation pump, kind of like a water pump on an engine, a heat exchanger and a PTC heater. Incorporated into this heating circuit are some valves and inside these valves are filters which can become blocked with sediment over time, hence the coolant flow becomes restricted and some hoses become hot and some become cold. You'd be forgiven for believing the coolant pump (electric) had failed due to the variations in temperature, however the filters would be my first port of call as a diagnosis here! The Mitsubishi was then past over to our other guy for a full service where I was told that the heater problem is coming back in another day. I wonder then who will get the credit for that diagnosis?