Question about 2007 Nissan Maxima 3.5 Sl Sedan

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Install new block heater

I bought a 2007 maxima with a 3.5 that had no block heater. How hard are these to install? I am very mechanically inclined, and am prepared to do this myself opposed to paying a dealer $80 / hour.

Have you done this? if so how tough is it to do on a Maxima?

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  • John Timmer Nov 05, 2008

    Thanks for the additional information, it certainly will help. I wasn't sure if there was a particular frost plug that was the best to use for this application or should I just pick the easiest one to access. We saw temperatures below - 35 degrees last year, and the car never skipped a beat. That said, it has to be hard on it so I think I'm going to install the heater and be done with it. My first thought was to install a circulating heater (the easy way out), but I hate to do that to this nice car.

    Thanks again!




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I have installed block heaters in lots of vehicles. I typically use the heaters that are in place of a freeze plug. I feel that these give better results and do not compromise the safety feature that the freeze plugs are there for in the first place.

You can pick these up in various sizes at any reputable auto parts store.

Nissan Scope Certified Technician- 10 + years experience in Nissan dealership

Posted on Nov 03, 2008

  • Jason Schoonmaker
    Jason Schoonmaker Nov 04, 2008

    I suppose that I didn't really answer your question very well... I apologoze.

    These freeze plug heaters are fairly easy to install. You will need to drain the cooling system (including the block drain- which is located on the forward side of the engine block) to completely drain the system.

    Next, find an accessible freeze plug and, using a chisel and hammer, tap on one side of the plug and it will turn sideways. Then use a pair of pliers to pull the plug from the hole. Make sure that the hole is clean and dry and apply a small bead of silicone sealant (RTV- I would recommend genuine Nissan silicone which is orange in color) to the heater you're going to install and tap that into the hole from which the freeze plug was removed. Let the RTV cure for at least 2 hours and then refill the cooling system with a 50/50 concentration of coolant/distilled water.

    Make sure that you run the engine until it reaches operating temperature and look for any leaks and make sure that you have good heat inside the vehicle.

    That's pretty much it... hope this helps a little more.

  • Jason Schoonmaker
    Jason Schoonmaker Nov 05, 2008

    I would use the easiest freeze plug that you can access. Having said that, I would try to stay as far away from the exhaust as possible also since you will have a cord coming off the the heater. Make sure that you route the cord so that it's not going to be close to the exhaust of fan or anything that could cause damage to the cord. I usually route the cord so that the plug is barely sticking out of the grille, making it easy to plug an extension cord into. There should be a cap to put on the cord when it's not plugged in to keep debris and water out of the connector.



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