Overheating

Henry Allen · Mar 1st, 2015, 19:56

Hi , I have a Volvo V40 1.9 TD. when I start it up it will drive for a while and then overheat, if I then turn off the engine and restart it goes to normal temperature. When it is overheating the coolant comes out of the pressure cap, obviously I am then loosing coolant and eventually overheats again. Has any body got any ideas. thanks

310den · Mar 1st, 2015, 20:11

It could be your thermostat failed and not opening. Be worth testing it or just change it as not a high priced item.

skyship007 · Mar 1st, 2015, 21:35

Have you looked at the coolant for traces of oil and checked to see if there is coffee cream in the engine oil ??

It's probably just an Iffy thermostat or lots of air in the system if was fiddled with recently. The vent hole should be at the top of the thermostat and gen Volvo ones tend to fail open rather than shut.

Matt86 · Mar 1st, 2015, 22:05

Couple things it could be... I'd start troubleshooting it in this order...

1. air in the system, diesels have a air valve on the heater matrix pipe at the back of the engine to the bulkhead and one on the main water pipe its under the top intercooler hose. Undo them to check if there's any air while the engine is running. As soon as fluid appears close the valve.

If there's no air then check the coolant cap, it's rare but possible its failing and causing pressure problems.

Finally I'm guessing the water pump has failed. When was it last changed?

Mar 1st, 2015, 19:56	#1
Henry Allen New Member Last Online: Mar 3rd, 2015 18:53 Join Date: Mar 2015 Location: Walsall	Overheating Hi , I have a Volvo V40 1.9 TD. when I start it up it will drive for a while and then overheat, if I then turn off the engine and restart it goes to normal temperature. When it is overheating the coolant comes out of the pressure cap, obviously I am then loosing coolant and eventually overheats again. Has any body got any ideas. thanks

Mar 1st, 2015, 21:35	#3
skyship007 Premier Member Last Online: May 2nd, 2018 08:14 Join Date: Sep 2011 Location: DownSouth	Have you looked at the coolant for traces of oil and checked to see if there is coffee cream in the engine oil ?? It's probably just an Iffy thermostat or lots of air in the system if was fiddled with recently. The vent hole should be at the top of the thermostat and gen Volvo ones tend to fail open rather than shut. __________________ 2003 V40 1.9TD Mods: Scratches, bent bumpers, raised REAR mats & internal mud guards. SHELL ULTRA 5/40 & LIQUI MOLY CERATEC. Everyone should DYOR (Do Your Own Research)

Mar 1st, 2015, 22:05	#4
Matt86 Premier Member Last Online: Aug 1st, 2015 09:34 Join Date: Oct 2013 Location: Southampton	Couple things it could be... I'd start troubleshooting it in this order... 1. air in the system, diesels have a air valve on the heater matrix pipe at the back of the engine to the bulkhead and one on the main water pipe its under the top intercooler hose. Undo them to check if there's any air while the engine is running. As soon as fluid appears close the valve. If there's no air then check the coolant cap, it's rare but possible its failing and causing pressure problems. Finally I'm guessing the water pump has failed. When was it last changed? __________________ V40 1.9D 2004 Car Photos

Mar 1st, 2015, 20:11	#2
310den Senior Member Last Online: Jul 26th, 2015 22:56 Join Date: Aug 2014 Location: West Sussex	It could be your thermostat failed and not opening. Be worth testing it or just change it as not a high priced item.

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