TAMPA, FL, 3361-3961
PHONE: 813.888.7991
FAX: 813.243.8218 
MONDAY-FRIDAY: 8:30 A.M. - 5:00 P.M.
about us
warranty & returns
shop online
schedule appointment
contact auto air

login now
create account

View My E-Quote
View My Shopping Cart

Rock Bottom Prices
We offer wholesale prices to the public and can beat any competitor's price.

Like us on Facebook! +1 us on Google!

Click on the individual part below to learn how it functions with in your vehicle's A/C System.

compressors, evaporators, condensers, accumulators, orifice tubes, expansion valves, weld-on-barbs, splicer barbs, engine cooling fan, hoses and belts, receiver/dryers

Manufacturer & Supplier of Auto
Auto Air & Electric of Tampa sells a complete inventory of New & Remanufactured parts. We are a manufacturer and distributor of automobile air conditioning parts and provide automobile air conditioning service and repair. We order supplies directly from the after market manufacturers, if we don't have what you need in stock, we can make it for you.



The expansion valve's place in the system is at the evaporator inlet. Like any other valve, its job is to control flow; in this case, the amount of refrigerant entering the evaporator. Since system operating conditions vary (sometimes high cooling demand, sometimes low cooling demand) it is necessary to be able to adjust the amount of refrigerant entering the evaporator. For any given operating condition, if we were to to allow too much refrigerant to enter the evaporator, it would get too cold, and the moisture collected on it could freeze. This would not allow the hot interior air to pass through its fins, and the refrigerant flowing inside the evaporator would not be able to absorb the head from the air. This would eventually bring cooling to a halt. If we were to allow too little refrigerant to enter the heat, which would also result in inadequate, or no cooling. This process of varying refrigerant flow based on system cooling demand is referred to as "metering" the refrigerant into the evaporator.

So how does the expansion valve know how much refrigerant to meter into the evaporator, and how does it do it? First the "how it does it," and its quite simple. Expansion valves contain a movable rod which travels up and down inside the valve. As the rod moves up and down, it can open and close the passage inside the valve that serves as the flow path for the refrigerant. The valve does not have to be fully opened or fully closed at any given time. Its position can vary, or modulate, between the fully opened and fully closed positions. Because of this, it can very accurately meter the precise amount of refrigerant needed to meet any given cooling demand.

This internal passage inside the TXV is much smaller than that of the refrigerant flow pipe that delivers the refrigerant to it. Because of this, as the refrigerant flows through this passage, its pressure drops, and it becomes a low pressure liquid. So as you can see, the expansion valve also serves as a "dividing line" between the high and low pressure sections of the system.

Now the "how does it know how much" part. This is based on evaporator temperature. The warmer the evaporator is, the more refrigerant flow needed, and vice-versa. The expansion valve has a temperature sensing device called a sensing bulb. The sensing bulb measures the temperature of the evaporator and sends a signal to the movable rod inside the expansion valve. This signal corresponds to the amount of refrigerant needed, the rod moves to the propper position, and the correct amount of refrigerant enters the evaporator.

An expansion valve could somewhat be likened to the thermostat in an engine cooling system:

- The thermostat controls the flow of coolant from the engine to the radiator based on cooling system temperature.

- The exapnsion valve controls the flow of refrigerant entering the evaporator based on evaporator temperature, or A/C sytem load/cooling demand.


Delivery, Service, & Installation in Tampa Area

Nationwide & International Shipping Available

Call our knowledgeable staff today for the highest-quality products and services at the most affordable prices.

Are You Getting Ripped Off at the Gas Station?
Faulty gas pumps mean you could be buying watered down gas, gas with sediment in it, or getting less gas than you pay for.
Fri, 23 Jun 2017 16:06:00 GMT
Automakers Fight Weaker Sales by Cutting Shifts, Laying Off Workers
Despite other signs of a relatively healthy economy, automakers have been scheduling production cuts faster than at any time since the Great Recession.
Fri, 23 Jun 2017 13:59:00 GMT
Which Automaker Ranks Highest for Quality? Surprisingly, It's Kia
Kia topped the list of brands in J.D. Power's annual quality study — but only four Detroit brands made the top 10, and just one Japanese automaker.
Wed, 21 Jun 2017 17:20:00 GMT
Airbag Maker Takata Will Reportedly File for Bankruptcy
Takata, whose airbags were implicated in the deaths of at least 16 people worldwide, is reportedly filing for bankruptcy.
Fri, 16 Jun 2017 11:09:00 GMT
Only 2 Out of 37 Vehicle Models Pass the Headlights Test
The vast majority of midsize SUVs offer headlights that fail to light up the road effectively, according to a new study.
Tue, 13 Jun 2017 20:17:00 GMT
Shareholders Reward Tesla, But Remain Wary at GM
Investors are betting on Tesla to deliver massive growth, but worry that with U.S. auto sales starting to slump, GM could relive its previous mistakes.
Thu, 08 Jun 2017 11:22:17 GMT
It's Going to Cost You 30 Percent More to Insure That Tesla
AAA plans to raise its rates on Tesla vehicles by as much as 30 percent, saying they have 40 percent more claims, and repairs are costly.
Tue, 06 Jun 2017 14:09:00 GMT
Toyota Is Developing a Flying Car to Debut at the 2020 Olympics
Already the world's largest automotive manufacturer, Toyota might soon dominate personal transportation on the ground — and in the air.
Mon, 05 Jun 2017 16:25:00 GMT
It's Been a Bad Week for Uber — But Next Week Could Be Worse
Uber's finance chief just quit, its self-driving guru just got fired, and the company is in a huge lawsuit with Google. What else could possibly go wrong?
Fri, 02 Jun 2017 15:20:00 GMT
GM Cuts Half Its Workers from Michigan Plant
General Motors will eliminate a shift at a transmission plant in Warren, Michigan — meaning indefinite layoff for about 300 workers.
Thu, 01 Jun 2017 15:35:00 GMT
Ford CEO Tried to Fire His President — Then Got Booted Himself
Ford CEO Mark Fields tried to shift blame for the company's weakening performance to his top lieutenant — who then wound up with a significant promotion.
Thu, 01 Jun 2017 15:21:00 GMT
GM Accused of Cheating on Diesel Emissions
General Motors became the sixth automaker accused of using some form of cheat device to pass its diesel emissions tests, according to a class-action lawsuit.
Fri, 26 May 2017 17:02:00 GMT
Tesla Workers Suffer Almost Twice as Many Serious Injuries: Report
Workers at the Tesla assembly plant in Fremont, California, suffered serious injuries almost twice as often as average, says a study by non-profit Worksafe.
Fri, 26 May 2017 15:12:00 GMT
More Shakeups at Ford as New CEO Names His Own Team
Just days after Ford announced a new CEO, the company has ousted a number of executives and even rehired one who had left for Uber.
Thu, 25 May 2017 17:02:00 GMT
Some Uber and Lyft Riders Are Already Ditching Their Own Cars
The fast adoption of ride service technology bodes well for self-driving car technology, a big area of investment for many companies.
Thu, 25 May 2017 11:46:00 GMT
Did Ford Nix Its CEO Because He Was Too Much of a Visionary?
Mark Fields had a clear vision of where the industry is heading 10 years from now, but his grasp of current challenges was perhaps a little murky.
Mon, 22 May 2017 18:39:00 GMT
Ford CEO Mark Fields Ousted After Plunge in Sales, Stock Price
Facing increasing pressure as its sales, earnings and stock price all slide, the Ford board of directors has ousted CEO Mark Fields.
Mon, 22 May 2017 10:49:00 GMT
Your Favorite Car Companies Are About to Look Very Different
All three Detroit automakers are trying to find unique solutions to a very challenging future.
Thu, 18 May 2017 18:33:00 GMT
Ford to Slash 1,400 White-Collar Jobs, Mostly in North America
Ford shares sank on news the auto giant will cut about 1,400 salaried jobs in North America and Asia as part of a cost-cutting plan.
Wed, 17 May 2017 15:01:00 GMT
Ford to Cut 10 Percent of Global Workforce?
Under increasing pressure from stockholders as sales decline, Ford is reportedly looking to cut as much as 10 percent of its global workforce.
Tue, 16 May 2017 15:52:00 GMT
European Car Plants Halted by WannaCry Ransomware Attack
France's Renault and its Japanese alliance partner Nissan have been forced to temporarily idle some of their plants in Europe.
Mon, 15 May 2017 15:03:00 GMT
1.25 Million Dodge Ram Pickups Recalled Over Fatal Software Glitch
Fiat Chrysler is recalling over 1.25 million Dodge Ram pickups due to a software glitch that could cause airbag, seatbelt failure in rollovers.
Mon, 15 May 2017 14:41:00 GMT
Lyft and Waymo Will Collaborate on Self-Driving Car Technology
The announcement comes as the Alphabet-owned Waymo is suing Lyft's biggest competitor, Uber, alleging theft of trade secrets.
Mon, 15 May 2017 02:18:08 GMT
Real Men Don't Drive 'Green' Cars? Trump Voters Least Likely to Go Electric
A new study reveals that demand for electric vehicles is strongest in states that voted for Hillary Clinton in the last election.
Fri, 12 May 2017 11:46:00 GMT
Hardly Anyone Will Own a Car in 2030, Say Experts
A new report says 95 percent of us will be riding in driverless, shared electric cars by 2030.
Fri, 05 May 2017 18:34:00 GMT

Auto Air & Electric of Tampa
3816 W Sligh Avenue
Tampa, FL 33614-3961
Copyright 2012 Auto Air & Electric of Tampa
All Rights Reserved
sitemap | xml | reset web session | admin
Phone: 813.888.7991
Fax: 813.243.8218