Thank you for your feedback! We understand that some questions might seem counterintuitive at first, but we assure you that all questions in CDL Help are based on official Commercial Driver Handbooks.To verify this information yourself, follow these steps:1. Open Google and search for "California Commercial Driver Handbook".2. Click on the first link, which should direct you to the official California DMV website.3. Open the PDF version of the handbook.4. Go to page 70 (you can use the page selector at the top if you are viewing the page on a computer).5. Find the section titled "Engine Coolant", where this information is explained in detail.Clarification of the question:The handbook states that some vehicles have sight glasses, see-through coolant overflow containers, or coolant recovery containers, which allow drivers to check the coolant level even when the engine is hot.This is why the correct answer in our app states that you can check the coolant level of a hot engine.However, this does NOT mean that you should remove the radiator cap while the engine is hot. The handbook explicitly warns against this, as it can be dangerous due to pressurized steam and boiling coolant.Why this question is included in our database:This specific question and answer format is commonly found on real CDL exams, which is why we have included it in our database in this exact form. While the explanations might need better clarification, the question and the answer are correct and can be found on various exams.Continuous Improvement:We have a very large database of questions, and thanks to valuable feedback like yours, we can identify inconsistencies and make improvements. Based on this, we will be enhancing the clarity of question descriptions and adding more detailed explanations where necessary.We acknowledge that this question may seem unclear at first, and we appreciate your feedback. Our team is constantly working on improving the clarity of our questions, and a major update is coming by the end of the month.If you need further clarification, feel free to reach out to us via email, and we’d be happy to provide additional resources. Your input helps us make CDL Help even better—thank you!

Hello Sergei,Thank you for suggestion! We will be adding this feature to the update in coming days.

We typically respond to customer support requests within 24 business hours. We couldn’t find any recent messages from you about the issue you’re describing. One things you could try is to tap on locked tests, and tap on "Restore" button under the listed prices. If you’re still experiencing problems, we’d be happy to help — please reach out to us via email or Telegram, and we’ll assist you as soon as possible.

Thank you for taking the time to share your experience. We’re very sorry to hear that the Tanker endorsement questions did not reflect what you saw on your actual exam.After reviewing your feedback, we conducted an internal review of the Tanker question pool. We found that in some states there are variations and additional question formats that were not sufficiently represented in our previous version.In response, we expanded and updated the Tanker section in our most recent app update. We added more questions and broadened topic coverage to better reflect state-by-state differences and reduce gaps like the one you experienced.We appreciate you bringing this to our attention and wish you success on your next attempt.

We're sorry that you're experiencing difficulties restoring your subscription.If the issue remains unresolved, please contact our support team on Telegram: @tdhsupport .We will promptly look into the issue and help you restore access.Thank you for your feedback, and we apologize for any inconvenience!