Melanie Reiff
Updated on Aug 11, 2022
Many common engine problems involve your vehicle’s cooling system. If your vehicle has overheated or you’ve noticed a pink, yellow, or green fluid on the ground under your car, bring it in for a check.
It’s never wise to ignore either of these situations. Your mechanic will likely run a radiator cap pressure test to determine whether your radiator cap is functioning properly. A radiator cap is essential for calibrating the pressure in your car’s cooling system.
Running a test typically costs about $35. If the cap needs to be replaced, that will cost you another $5-$25, depending on the price of the cap.
A functioning radiator cap is necessary to keep your car running smoothly. That’s why car insurance app Jerry has created this guide to everything you need to know about a radiator cap pressure test.
The exact cost varies between different Mercury models. For example, newer vehicle models are usually made with more expensive materials, so recent or high-end models will cost more, especially if your service requires a part replacement. Use the table below to estimate the cost for your own vehicle.
CarTotal Cost EstimateParts CostLabor CostAverage Dealer PriceEstimated Service Duration
2006
$60$0$60$601h
1967
Mercury 
Brougham
$60$0$60$601h
2008
$60$0$60$601h
1979
Mercury 
Marquis
$60$0$60$601h
2001
Mercury 
Cougar
$60$0$60$601h
1980
Mercury 
Monarch
$60$0$60$601h

What is a radiator cap pressure test?

The radiator cap is calibrated to ensure the right amount of pressure is created and released when needed.
The radiator cap pressure test will measure whether your vehicle’s radiator cap is regulating the pressure in your coolant system properly. A car’s coolant system (which has antifreeze in it) serves to keep your engine from running too hot.

How to conduct a radiator cap pressure test.

While a radiator cap pressure test is fairly easy, it requires the correct equipment. This is why the average car owner relies on a professional mechanic to diagnose problems with their coolant systems.
The first thing your mechanic will do is make sure the engine is cool before conducting any tests. Always avoid taking a radiator cap off when an engine is hot—you can be scalded by hot liquid.
Next, the mechanic will remove the cap and attach the cap to a special pump, which reads the pressure. If the cap does not register the correct pressure—or does not hold the pressure for at least a minute—it’s no longer working properly.
If a problem is found with the cap, the mechanic will replace it. New radiator caps typically cost between $5 to $25 without labor.

When do I need to test the pressure in my radiator cap?

There are several signs that something is wrong with your coolant system. Not all of them involve a problem with your radiator cap, but mechanics may test the cap if any of these issues develop:
  • The vehicle overheats
  • The radiator’s overflow bottle is too full or overflows
  • You notice that coolant is leaking underneath your car
  • There are problems with radiator hoses

How important is a radiator cap pressure test

Because driving a vehicle with an overheated engine can damage cylinder heads, never ignore a problem with your coolant system. A radiator cap pressure test is an essential diagnostic tool that a mechanic uses to find the cause of the problem, whether it be leaking fluids or an overheating engine.

How to find cheap car insurance

Making sure your car is in working order can be a hassle, but finding cheap car insurance shouldn’t be!
It’s this simple: download the [Jerry] (https://getjerry.com/signup) app or go to getjerry.com. In less than 45 seconds, Jerry collects all of your information from your existing insurer.
Choose from competitive quotes from 50-plus top [car insurance] (https://getjerry.com/car-insurance) companies and Jerry takes care of the rest—securing your new policy and helping you cancel your old one. No long forms. No calling around. No hard work. Just savings. The average Jerry user saves $887 a year on car insurance.
Keep in mind that your location is another factor that determines the final cost of repairs. Areas with higher cost of living will usually have more expensive car repair services, especially if there’s less local competition. Check out the table below for an estimate of what Mercury drivers pay in different cities.
CityCarTotal Cost EstimateParts CostLabor CostAverage Dealer PriceEstimated Service Duration
1978
Mercury 
Bobcat
$128.25$0$128.25$128.251h
1982
Mercury 
LN7
$111$0$111$1111h
1971
Mercury 
Montego
$112.88$0$112.88$112.881h
1995
Mercury 
Tracer
$131$0$131$1311h
1966
Mercury 
Montclair
$131$0$131$1311h
1979
Mercury 
Marquis
$126.67$0$126.67$126.671h
1981
Mercury 
Zephyr
$106.65$0$106.65$106.651h
1984
Mercury 
Lynx
$125.83$0$125.83$125.831h
Westbrook
CT
2006
$149.38$0$149.38$149.381h
1970
Mercury 
Cyclone
$108.5$0$108.5$108.51h
Jerry doesn’t just offer fair price repair estimates for Mercury drivers! Our team of writers has collected everything you need to know for every car. Here’s how much the repair costs for some popular cars:
CarTotal Cost EstimateParts CostLabor CostAverage Dealer PriceEstimated Service Duration
2002
Chevrolet 
Silverado 1500
$60$0$60$601h
1994
Ford 
E-350 Econoline
$60$0$60$601h
2002
Lincoln 
Blackwood
$60$0$60$601h
1968
Renault
 
R16
$60$0$60$601h
2005
GMC 
Yukon XL 1500
$60$0$60$601h
2009
$60$0$60$601h
The cost of repairs might vary depending on which Mercury you drive, but there’s an easy way to save money for the services you need! Just download the Jerry app for help lowering your insurance premiums. In less than 45 seconds, Jerry collects all of your information from your existing insurer. Choose from competitive quotes from top insurance companies and Jerry takes care of the rest—securing your new policy and helping you cancel your old one upon request.
With an average annual savings of $887, Jerry can help you free up funds for the repairs your Mercury’s needs.