Question about 1995 Jeep Grand Cherokee

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What do I fill the radiator with water or 59/50 antifreeze.

Heater blows but not heat.

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With no more info than that, I'll tell you what I can.

First off, your radiator should have a mix of antifreeze and water (either pre-mix or mix yourself). The mix has a lower freezing point *and* a higher boiling point than even straight antifreeze (or water, of course). Additionally, the antifreeze has anti-corrosion chemicals added. So you should maintain the mix year round. [50 years ago we ran water in the summer and mix in the winter - but no longer.]

Now, as to why your heater is not putting out heat - that's a different question. Your heater is basically just another small radiator, through which the engine coolant is run. The fan blows air over it, picking up heat, and blowing the hot air out into the cabin. Given that the fan is working, there are generally three things that can cause your problem.

1. If it puts out a little heat, but not much - is the coolant actually reaching the proper temperature? If you have a REAL coolant temperature gauge on the dash, is it somewhere around mid-range? [More importantly, somewhere around where it has always been before, when the heater worked?] If it is not, then you probably have a bad engine coolant sensor, which is thinking the engine is hotter than it is. Simple and inexpensive replacement. Alternately, if you are in a really cold area, a bad radiator cap could be preventing the coolant from circulating as it should. Again, trivial and relatively cheap to replace.

2. You could have a plugged heater core. Shop can pull a hose and try to blow air through there. Usually the blockage can be blown out. Again, fairly cheap - although a bit messy, so you probably want your mechanic to do it. Cheap, *if* the heater core does not need replacing. [The heater core isn't particularly expensive, but on some models it is a real pain to get to.]

3. Valve not opening. There is a valve that controls whether (and how much) hot coolant circulates through the heater core. On older vehicles this is controlled by a leaver in the cabin, and moving the leaver simply pulls or pushes on the valve, opening or shutting it. Newer ones are electric, and a bit more "invisible." You can kind of get a feel just from moving the control as to whether it is mechanical or not. But it likely is going to need replacing/fixing by a mechanic. Nothing complex - but GETTING TO IT is sometimes a nightmare.

3.5 There are a couple of other things in some systems (don't have a shop manual for your Jeep handy). A few vehicles use pneumatic valves (some older Fords), and some can also have problems with pneumatic flaps in the air ducts themselves (controls mix of outside/inside air). Those can be a real bear to get to - so, unless you remember something (like "it used to make a loud noise when I switched to heat, and now it doesn't"), start with the simple things first.

Good luck...

Posted on Nov 27, 2014

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Always use 50/50 antifreeze, unless u live in an area where temperatures drop below the stated protection zone. As for the heat, low coolant will cause no heat, as well as a possible vacuum leak that will not allow the diverter door inside ur dash to open. If it's not something simple as adding coolant, I reccommend taking it to a service center you trust. It can be quite trying to figure out all the different possibilities.

Posted on Nov 27, 2014

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Your problem is not your antifreeze mixture, you have a circulation
problem to your heater core. Most of the time it's a valve that's not opening on the firewall. You can bypass by running heater hose directly to heater core but then it's always going to put out heat even with the fan off. By the way 50/50 is the correct mixture.

Posted on Nov 27, 2014

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Premixed antifreeze 50/50

Posted on Nov 27, 2014

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50/50 premixed antifreeze, or 1 gal regular antifreeze with 1 gal distilled water= 2 gals of 50/50. Only low coolant level will affect heater output, usually a thermostat that is stuck open, replace.

Posted on Nov 27, 2014

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