Discovered a leak in the dash heater core and the Volvo dealer said that the coolant must be drained and refilled under vacuum to avoid air locks. So basically I can't do it myself. Any truth in this?. I was going to drain enough coolant out by removing the coolant filter. The core and expansion tank are at roughly the same height so it shouldn't need much drained out. Then after the new core is in, run the engine with the expansion cap off to burb the system. Truck is an 07 780 with the D12.
thanks.
Replacing Dashboard Heater Core
Discussion in 'Volvo Forum' started by TheEnglishMan, Apr 19, 2015.
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Sounds like the Volvo dealer has been getting to close or living in a vacuum.... lol
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I don't know about your specific model. Whenever I have drained fluid for repairs. I have changed the entire bunk heater, Front radiator, misc. hoses. thermostats. I never worried about a air bubble in the system. Most trucks I have worked on had shutoff valves for the front heater and the bunk heater. Just flip them off and drain the heater core. Refill your overfill tank or the radiator directly. Heat the motor to operating temp. Let it run about 30 minutes. Let cool check fluid add as needed.
I may be wrong but I think this dealer is trying to get a little work from you. Call a different dealer for another opinion.
Good luck. -
I've done same thing on my ISX. And now every now and then I get very little heat till I crank it way high. And then I get too much. Do it yourself and then have dealer drain and refill it.
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has nothing to do with "dealer drain and refill" you have a bad heater control valve. they are made of plastic and stop opening and closing properly internally. your increased flow rate is controlling how much heat you are getting instead of the valve controlling it. good luck.
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My local dealer is going to do the work. I'll take the truck in with the dash dismantled so they only have to drain, switch out the cores and then refill. Should be about an hours work or less. Then I'll do the dash reassemble.
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