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K. Wiggins
K. Wiggins, ASE Certified Technician
Category: Ford
Satisfied Customers: 2514
Experience:  AA in automotive Technology, 15+ years in the trade
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How can i check if my water pump is working correctly? At

Customer Question

How can i check if my water pump is working correctly? At some point should i not be able to see the coolant actually flowing through the radiator with the cap off
Submitted: 1 year ago.
Category: Ford
Expert:  K. Wiggins replied 1 year ago.

Hello, That's correct about seeing the water flow through the radiator with the cap off. Once the thermostat is open the water will begin to move and the upper radiator hose will become very warm and also have a felt resistance if you should squeeze it by hand.

Customer: replied 1 year ago.
if I don't see that flow and its not working correctly what will my symptoms be
Expert:  K. Wiggins replied 1 year ago.

Overheating of the engine and no/little heater output

Customer: replied 1 year ago.
The truck isn't overheating but my heat is intermittent
Customer: replied 1 year ago.
Warm usually when im going down the road but cools down at idle
Expert:  K. Wiggins replied 1 year ago.

Thanks for the additional information. It sounds like you have some bloackage in the system. It's very common for rust and scle to build up over the years.

What I suggest in this case would be to flush the system. I recommned the kit below as well as a good radiator flush product such as Bars leaks or Prestone brand.

http://www.amazon.com/Prestone-AF-KIT-Flush-Fill-Kit/dp/B000CCFY5W

There's intructions on the kit, but basically it splices into the heater hose and uses a garden hose to flush the system after a flushing chemical is used to loosen any rust/scale in the heater core and radiator.

Expert:  K. Wiggins replied 1 year ago.

It's also a good practice to change the thermostat after the flush.

Expert:  K. Wiggins replied 1 year ago.

Hello, I was just wanting to follow up and see how things went.

Expert:  K. Wiggins replied 1 year ago.

Hello, just wanted to follow up and see how things went.