In just one week ,I’ve either seen on fire or burnt out the following. One coach (Cornwall), one truck ((Bridgewater) , one of the line painting jobs)), and five Vauxhall Zafiras. Is it the heat?
Diesels with dpf’s have to get extremely hot in the region of 650° could be one cause of vehicle fires these days. Especially if some mechanic that has worked on it hasn’t replaced heat shields around the exhaust or they have rusted and come off. Or a fluid leak of diesel for example hits the hot exhaust.
Hot weather can also play a part in vehicle fires of course.
Many reasons why a car can set on fire, electrical shorting is another example. Sure it was Peugeot who had a big recall some years ago due to starter motors staying engaged and burning out and starting a fire.
BMW police vehicles were taken off the fleet due to a fire related to the dof if memory serves me correct.
And Vauxhall models including the Zafira had a recall due to a blower motor risk of setting on fire. Could well be vehicles that have missed out on the recall to Vauxhall being that particular model.
That’s just some examples of what vehicles can end up ablaze.
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We have people over here that have mainly 4WD’s catch light because the spinifex builds up underneath and catches light.
I think there’s gonna be a nationwide shortage of car transporters due to the number of these catching fire in recent years
We’re in the deepest depths of winter here, with daytime temperatures of 27⁰~29⁰C. We don’t have cars, or trucks, spontaneously combusting, so I seriously doubt the ambient temperatures are the cause. Some air conditioning systems use flammable gases, such as LPG, that’s more likely to be a factor.
Star down under.:
We’re in the deepest depths of winter here, with daytime temperatures of 27⁰~29⁰C. We don’t have cars, or trucks, spontaneously combusting, so I seriously doubt the ambient temperatures are the cause. Some air conditioning systems use flammable gases, such as LPG, that’s more likely to be a factor.
Most car/truck Aircon systems use R134a or R1234yf refrigerant. Not sure without checking but doubt it’s the same as LPG but both are probably flammable. Seems R1234yf is mildly flammable but R134a isn’t.
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Star down under.:
We’re in the deepest depths of winter here, with daytime temperatures of 27⁰~29⁰C. We don’t have cars, or trucks, spontaneously combusting, so I seriously doubt the ambient temperatures are the cause. Some air conditioning systems use flammable gases, such as LPG, that’s more likely to be a factor.
Buses seem to be the favourite for going up in smoke. It was happening while I was ‘on the buses’ and still does now. gas powered rather than diesel, burning. I was coasting down the outbound side of Victoria bridge with an LPG bus when it blew the guts out of the silencer. I bloody near went out through the roof. 
peterm:
We have people over here that have mainly 4WD’s catch light because the spinifex builds up underneath and catches light.
Luckily the roads around the schools here in the UK are mostly clear of Spinifex so at least that is a problem we can avoid.
8wheels:
peterm:
We have people over here that have mainly 4WD’s catch light because the spinifex builds up underneath and catches light.Luckily the roads around the schools here in the UK are mostly clear of Spinifex so at least that is a problem we can avoid.