Zerostart / Temro FAQ

Most of these heaters heat and circulate the coolant by Thermal Siphoning. Thermal siphoning refers to the process of heated coolant rising, thereby drawing cooler coolant in to replace the warm coolant.

The only Circulation Heater that has a pump is the Forced Flow Circulation Heater.

Circulation Heaters are used for industrial, agricultural and off-road applications. Check out the Circulation Heaters page or the  Zerostart / Temro Catalog for details.

If your car is newer than 1995, the circulation heater will not work. We do have other options to pre-warm your vehicle, like Freeze Plug Heaters, Engine Block Heaters and an array of aftermarket products like Pad Heaters or the Heat Magnet.

Yes, the heater is working however circulation has not been established. These heaters work using Thermal Syphoning. It is important to clear bleed all air from the lines. To test for this you will need to drain a small amount of coolant from the line.

Here are the steps:

1. Have a small bucket or pan ready to catch the coolant.
2. When the vehicle is cool, loosen the top (outlet) hose from the fitting and put your thumb over the end of the hose to block the fluid.
3. Lower this hose to below the Circulation Heater.
4. Allow some coolant to drain into the pan until there is no obvious, entrapped air affecting smooth flow.
5. Bring the line back up to the fitting and reattach.

The overheat temperature is 185°F.

The overheat temperature is 190°F.

Check to make sure that the hose is attached to the outlet on the circulation heater properly. If it is not attached properly or is completed unattached, then it will not heat your engine. To fix this, simply bring the hose back up to the outlet fitting and reattach it. If the hose is loose, tighten the metal fitting that goes around the hose and outlet.

No, a 2 inch hose is the largest our LRRH products accommodate. Check out our circulation heaters to find a better product for your problem.

Yes.

No, This heater is dependent on the upward rise to circulate the warmed fluid. We do have other circulation heaters that may work better for your application.

We will need to know the make and model of the engine. In some cases we may need the year. Refer to the Zerostart/Temro Catalog for more information.

GM has a thermostat in the cord. All GM block heaters have a cord with an in-line thermostat in the cord. The heater will come on at 0° F or -18° C.

No, using a cord without a thermostat will cause the check engine light on the dash to light up.

The engine manufacturer has determined that the best location is the left side of the engine. However, if you can determine that the block heater can be

1) Installed securely

2) At the same or lower elevation

3) And the element does not make contact with the wall of the engine, then the heater can be installed on the right.

There is no difference. Both describe a heaters that is used to warm the engine coolant in the block.

• A freeze plug uses the V-Loc system to lock the heater into position in the block by tightening the clamps against the wall of the engine.

The location is determined from the point of view of sitting in the driver’s seat. For example if the location is listed as right front, “rf” this means the passenger side of the engine toward the radiator in a conventional engine orientation with of the radiator to the front of the vehicle. If the engine is transverse, the position is again on the passenger side of the vehicle on the front corner of the engine.

The most likely cause is that there isn’t sufficient coolant covering the heater. One of the possible issues is that the vehicle is started while the heater is still plugged in the power. This can cause an air pocket to form around the element, preventing the transfer of heat and causing the element to burn out.

The LR number stamped on the side of the heater is the CSA File Number, Canadian Safety Administration; this is like the UL, Underwriters Laboratories in the United States. The CSA certification ensures the product will be safe and durable. We will need to know the model and manufacturer of the engine to determine the part number for the heater.

Antifreeze, liquid soap or silicone grease. Do not use petroleum based lubricants on the O-rings, this will significantly reduce the life of the O-ring.

We do not make a tester. There are several on the market, or you can use an Ohm meter.

Each heater is designed to fit a specific engine block. You will need to Contact Us in order to determine if it is correct for your tractor.

Absolutely.

When the GFI gets wet from moisture, rain, puddles, pressure washing, or snow the GFI will trip until it is dry.

• Disconnect the heater (cord) plug from the heater. Clean and dry it as well as possible.
• Clean and dry the cord plug.
• Reconnect the cord to the heater.
• Try it again to see if the GFI trips.

To pre warm your vehicle, the block heater should be plugged in at least 3-4 hours. There is nothing detrimental about leaving it plugged in overnight or longer.

Please see page 120 of the Zerostart/Temro Catalog.

With a multi-meter to check the Continuity or Resistance Test.

This is due to the element burning out. Fluid is needed to dissipate the heat from the element. You will need to purchase a new heater.