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Check / cleaning heater core 200 1984

posted by  Volvodad on  Thu Apr 14 03:01 CST 2005
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last visit: Thu Oct 23 16:18 CST 2014
[RELATED]

If you have doubts about the heater valve, replace it with a non-thermostatic one - that's what Volvo dealers are doing. FCPGroton have them.

Core flush: you may be referring to an old post of mine. I disconnected the hoses at the heater valve and, using a couple of three-foot extensions made from heater hose, rinsed the core back and forth with that "CLR" scale remover available at any grocery store. A lot of crud came out, and more when I connected the garden hose to it and power flushed it. Care needed with this step; the 240 cap is set to limit cooling system pressure to 75kPa (about 11 psi) whereas your house water supply may get to 500kPa (75psi).
--
Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar 77 MGB, and a few old motorcycles)






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