Heater: 850: - Engine overheating after heater core replacement.

kurts2 · Aug 23rd, 2017, 01:37

Was driving the car the other day and the heater core ruptured causing a bunch of steam in the cab as well as the cab flooding! I was close to home and got there before the engine overheated. Put water in right away and then let sit overnight. Today I put in a new core and topped off with antifreeze. It took less than a half a gallon though. I guess too much water in the system. Ran the car till normal temp and checked for leaks prior to putting the dash pnls back on. All seemed fine untill I took it for a test run. Within 15 min, I had an engine overheat. Figured it was a vapor lock and let it cool a bit then opened the cap. I was able to get a few cups of fluid in (it was down). Drove again and overheated again! Is there a good way to bleed out the air?! Or maybe its due to not enough coolant to water ratio?

cheshired5 · Aug 23rd, 2017, 02:07

When the overheat starts to happen you need to check all hoses are too hot to hold first, particularly the heater pipes and radiator top and bottom hoses.
If one is significantly cooler or not as hot as the rest, you have a circulation issue.

Luxobarge · Aug 23rd, 2017, 09:05

As above, especially the pipe temperature either side of the thermostat - sounds like this episode may have tipped your 'stat over the edge and it may be stuck shut.

Baffler · Aug 23rd, 2017, 14:04

Genuine Volvo or aftermarket replacement?

Aug 23rd, 2017, 01:37	#1
kurts2 New Member Last Online: Jan 26th, 2023 18:18 Join Date: Aug 2017 Location: bwb	Engine overheating after heater core replacement. Was driving the car the other day and the heater core ruptured causing a bunch of steam in the cab as well as the cab flooding! I was close to home and got there before the engine overheated. Put water in right away and then let sit overnight. Today I put in a new core and topped off with antifreeze. It took less than a half a gallon though. I guess too much water in the system. Ran the car till normal temp and checked for leaks prior to putting the dash pnls back on. All seemed fine untill I took it for a test run. Within 15 min, I had an engine overheat. Figured it was a vapor lock and let it cool a bit then opened the cap. I was able to get a few cups of fluid in (it was down). Drove again and overheated again! Is there a good way to bleed out the air?! Or maybe its due to not enough coolant to water ratio?

Aug 23rd, 2017, 02:07	#2
cheshired5 Premier Member Last Online: Dec 26th, 2021 13:42 Join Date: Dec 2013 Location: Crewe	When the overheat starts to happen you need to check all hoses are too hot to hold first, particularly the heater pipes and radiator top and bottom hoses. If one is significantly cooler or not as hot as the rest, you have a circulation issue. __________________ 2002 S60 SE D5 Manual 209000 miles

Aug 23rd, 2017, 09:05	#3
Luxobarge Premier Member Last Online: Today 10:45 Join Date: Jan 2011 Location: Horne (Nr. Horley)	As above, especially the pipe temperature either side of the thermostat - sounds like this episode may have tipped your 'stat over the edge and it may be stuck shut. __________________ Some people are like Slinkies, they serve no useful purpose but they still bring a smile to your face when you push them downstairs.

Aug 23rd, 2017, 14:04	#4
Baffler Premier Member Last Online: Apr 21st, 2024 15:36 Join Date: Dec 2002 Location: Co. Limerick, Ireland	Genuine Volvo or aftermarket replacement? __________________ Liam... '96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.

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