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
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.
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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.
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.
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.
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.
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.
No heat is often a symptom of low coolant, usually followed by overheat. There are other controls that regulate heater, but right now, re-fill the cooling system with engine running and heater on high, then check for leaks (coolant you lost went somewhere...you need to determine where) Low coolant will damage your engine. Take care of that first, then if heater still does not work, then do diagnosis on that. (if you loose the engine heat won't matter, will it!)