Question about 1999 Volvo S70

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Replace Heater Core for Volvo S70 (1999)

Hi, My Volvo S70 heat & defrost is not working. When I fill the radiator with coolant it leaks on the floor of the driver side and if I turn on the heat or defrost the car runs hot. Can it be my heater core is bad? And how easy is it to replace? Thanks

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  • Anonymous Mar 26, 2014

    replace

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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.

Posted on Feb 12, 2009

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We had the same problem - it was the heater core - but now the coolant disappears and we don't know where it is going - think the head gasket is shot since the car overheated..ugh.

Posted on Jan 19, 2009

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2012 mustang having no heat and no hot defroster. It blows just fineto vents, defroster and floor, but only cold air! When i change controls to floor only and press gas, after a bit i feel a little warmer...


Make sure radiator is full of coolant, this system heats the vehicle, also if you can smell coolant it may be a bad or leaking heater core? Hope this helps?

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Defrosting vent is steaming out and smells like anti freeze. would it be heater core


It sounds like it, feel the rug on the passenger side if its wet then that will confirm a heater core problem.

I hope this helps you out, if it does any positive feedback would be appreciated. Thank you.

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My front defroster is not working at its best, however the back one is working properly. If I add any heat while trying to defrost my windows the problem get worst.


Sounds like the heater core is leaking coolant. If it is leaking it will blow steam out of defrost vents and fog the windshield. Symptoms: low coolant level in radiator, steam coming out vents when engine is warmed up, odor of anti-freeze coming out of vents, wet carpet in floorboard near heater blower motor.
If so, replace heater core.

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Heater does not warm up. it blows out cold air


I would inspect the car for coolant leaks. If there are any they need to be repaired. Check coolan level in radiator, if full than follow this procedure. Change radiator thermostat. Drain old coolant. Remove heater core hose. Take a garden hose and run water through the heater core for 3-4 minutes or until clear. Retighten Hose. Fill radiator with premix coolant. Star car and let run with defroster on and heat on full blast. Let run for 20-30 minutes and wait till radiator fan to come on. Add coolant as the level drops in the radiator.Also open coolant bleeder screws to purge out air.

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If the heater core is not damaged or leaking ie: if you don't see coolant on the INSIDE of your windshield or coolant on the floor inside the car then chances are you may just need to BLEED the radiator.

remove radiator cap

Fill coolant resovoir to the cold line if the engine is cold from sitting overnight.

Start engine with cap off

Wait till engine gets hot

While waiting you will see a big gurgle of air bubbles come out and the coolant level will drop

Fill the radiator with more coolant to compensate.

When the fans come on and it stops gurgling air install the radiator cap

You are done

Watch the coolant level for the next few days and top off in the resovoir as needed to keep it filled.

Your heat should be very hot now providing you installed the correct oem thermostat correctly.

Hope this helps

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a heater uses the temperature of the cars water, running threw a heat exchanger if the heater core has failed water will not circulate threw the engine properly this will and can cause over heating as well as nothing blowing from the heater. good luck.heater cores are generally inexpensive parts to replace.

last thing you can check if heater core is ok. is the thermostat.

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Sounds like the heater core is leaking. Fill up the coolant and look under the carpet on the passenger side and see if there is not coolant there. IF it is a really minor leak you may be able to use a radiator fix, but do not buy something cheap and follow the directions. If one application does not seal it up, replace the heater core. It is not worth overheating the motor to try more of the sealer; it can clog the coolant passageways in the motor.

Hope this helps

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