Hope this is of use to help solve the various heating issues people experience. It's a heck of a lot cheaper than forking out the money (£100 odd for the Dual Coolant Valve and £200 - £300 for the Changeover Valve, versus £20 - £30 odd for the repair kit) to replace one or other of the two different solenoid valves. The dealer said to bring it in but since I have around 43,000 miles I will have to pay for the diagnostic test if it is not covered by my power train or emissions warranty. With the Dual Valve, it's most likely only one of the two valves that is faulty/not working. Thermostat problems (P0597) My check engine light came on recently and I found out that it was code P0597 which is Thermostat Heater Control Circuit/Open. Most of the repair kits come with two sets of replacement parts, so the spare parts can also be used on the Dual Valve as well. I would recommend, as a first step, getting the repair kit and replacing the solenoid plunger, rubber washer and o-ring on the single Changeover Valve, and see if that solves the (lack of heat) problem. The rubber washer in this valve is more likely to get swollen or perish, as it is constantly subjected to hot engine coolant flowing over it. ![]() If you are getting no heat at all, or very little heat through either side of the cabin, then it's this valve at fault. This is why I've got the repair kit and am getting him to replace the internals on the changeover valve. My mechanic tried to clean and grease up the washer in the single changeover solenoid valve, it would work briefly and we would get heat through the heater, but the rubber was too perished to do its job, the valve would get jammed and then no heat at all, or limited heat through one side of the matrix, as only a small amount of hot coolant was passing through the valve. no heat or limited heat through one side only, I replaced the double solenoid valve first to no effect. when the rubber washer is knackered, the engine coolant won't get to the matrix. When the FBH operates the changeover valve routes coolant to the matrix, but if this valve is not working properly, i.e. The double solenoid valve routes coolant to either side of the matrix, but coolant first has to go through the single valve. ![]() ![]() The double solenoid valve unit is for the coolant to the heater matrix, but it's not the valve that causes the main problems, its the changeover valve that channels hot coolant to the heater matrix either from the FBH or from the engine.
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