There is air in your water system because of the replacement. Check the service manual how to release the air and should be done when engine is warm to hot. Also switch ON the heater fan to full before bleeding
You most likely had air trapped in the cooling system after the heater core replacement .Its CRITICAL all air is bled out of the cooling system ,and when servicing the cooling system not only is it important to bleed out any and all air .You also need to make sure the cooling system is topped off correctly .Since i don't know the year ,and model Its hard to say why it wont start .Unfortunately when you over heat a car to the point it dies .Then i would be more worried about cracked and or blown head gaskets .All it takes is one time on many cars To overheat it to a point of stalling many times head gaskets crack ,even cylinder heads around the valves can crack .You would be very lucky if no damage resulted from overheating ,which in this case the worst thing to happen or do is keep driving it ESPECIALLY until it stalls You should have pulled over the second you knew it was getting hot and let it cool You may have caused more damage than you realize Like i said if nothing happened from overheating the car then your extremely lucky
SOURCE: Replace Heater Core for Volvo S70 (1999)
It is your heater core. I fixed mine for $144. Ordered the new part on Ebay and followed these instructions http://www.volvospeed.com/vs_forum/index.php?showtopic=9717 It was very simple, I'm a middle age grandmother! The hardest part was cleaning up all the antifreeze. You will need a shopvac, a small one is $20 at WalMart.
SOURCE: 1998 Volvo V70 with potential transmission problems?
Yes, it's the 'pnp' switch (also known as the inhibitor switch) which is on the side of the transmission.
I own 2 Volvo 960s (3 litre automatics) which are similar in many respects ... and have that flashing arrow. It's a well known fault and you don't have much to worry about.
Rather than write it all here, you can read what I wrote as an ebay guide about it at http://reviews.ebay.co.uk/Volvo-960-Automatic_W0QQugidZ10000000003233806
I did put similar info on my website at http://www.glennsmart.btinternet.co.uk/volvo960.html with photos
Though the ebay guide is better ...
If you haven't got time to read it ... forget the flashing arrow and put a bit of black tape over it ... My wife's car has (192,000 miles) had that arrow flashing for 3 years. My car (100,000 miles) has had that flashing arrow since I bought it 1 year ago.
I did change the pnp on both cars ... but you also need to have the computer error reset by Volvo to have the light extinguished. Don't worry ... keep driving.
SOURCE: 1993 Volvo 850 wont start...help?!
It sounds like your fuel pump is having a problem with getting the last of the fuel from your tank. The pump also has a strainer on it. The unfortunate reality with the 1993 Volvo 850 is that the pump and strainer are located inside of your gas tank. You can look for kinks or pinched areas in the line but from your description it sounds like the pump is going. It has to work much harder when the fuel is low in the tank.
SOURCE: volvo s70 heater core
FIRST OF ALL YOU NEED A HAYNES OR CHILTON REPAIR MANUAL.IT WILL TELL YOU HOW TO GET TO HEATER CORE.AND YOU NEED TOOL NO.155 8957 DISCONNECT THE HEATER HOSES FROM HEATER CORE.AND YOU NEED A TORX 20 SCREW DRIVER TO REMOVE SOUND PROOFING PANEL TO DASHBOARD SCREWS.
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