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Old 02-15-2014, 09:27 PM   #1
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Heat Question

I have a 93' w/ 2.5l. I'm running a new bestop soft top with half soft doors. My question is what Temp does the heat normally blow out at? I believe I'm not getting heat like I should be. If I put my hands on the defrost its warm but not hot and at the vent on the floor its only slighty warm (feet never get hot even if left right in front of the vent.. Im curious to if thats normal or should it be hotter? I ive asked a few people Ive run into with jeeps and some say heat sucks and some say theirs runs them out... Ive put new sensors in and a new thermostat and once the weather breaks am replacing the radiator and heater core. just curious if I should be getting decent heat or not.

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Old 02-15-2014, 10:19 PM   #2
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IF, the heating system is working correctly, and the top is sealed good, then after the motor gets up to temp, the fan switch should never be on anything but low.

Is your new thermostat a 195 degree? That is what is needed.

Mine is a 4.2L and a hard top, but, if you get it up to temp, you cant hold your hand on the defroster vent for more than a couple seconds. I don't think its actually enough to burn, but it feels that hot.

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Old 02-15-2014, 11:26 PM   #3
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My heat blows hot. I'll shoot it with the flir infrared camera from work one day. Gotta be 150
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Old 02-16-2014, 11:44 AM   #4
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Here's pics of what I had today with the defrost on high for like 20 mins after it got to temp
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Old 02-16-2014, 11:50 AM   #5
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95 degrees? that aint even warm yet.

Like rednek said, its at least 150 or better.

Go through the sticky at the top of the tech page, and look at it compared to your heating system. It explains everything in detail.
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Old 02-16-2014, 12:00 PM   #6
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Not sure where you seen 95 degrees the vent temp was 105.6 and the temp gauge was a little below 210
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Old 02-16-2014, 12:12 PM   #7
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Quote:
Originally Posted by MyFirst93yj View Post
I have a 93' w/ 2.5l. I'm running a new bestop soft top with half soft doors. My question is what Temp does the heat normally blow out at? I believe I'm not getting heat like I should be. If I put my hands on the defrost its warm but not hot and at the vent on the floor its only slighty warm (feet never get hot even if left right in front of the vent.. Im curious to if thats normal or should it be hotter? I ive asked a few people Ive run into with jeeps and some say heat sucks and some say theirs runs them out... Ive put new sensors in and a new thermostat and once the weather breaks am replacing the radiator and heater core. just curious if I should be getting decent heat or not.
upgrade thermostat. goto upull and save. junkyard. get late 90's grandprix blower. it will fry eggs on your dash
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Old 02-16-2014, 06:53 PM   #8
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Thermostat is new and upgrading the blower wouldn't make it have more heat. More air yes but it blows enough air
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Old 02-16-2014, 07:06 PM   #9
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HELLO,
This is easy enough, first let her cool off place a drip pan under the engine, disconnect the heater hoses from the heater core. Connect a garden hose to one of the ends and a short hose to the drip pan from the other heater core line and back flush the heater core. if you have restriction then problem is in the core. I would then blow out the core with air to remove most of the water and hook everything else up and top off the coolant. if not then take a look at the fins of the core and ensure they are not blocked with crap / debris. You need air flow to take the heat where you need it. If the engine is making the heat and yours is then its likely in one of these areas.
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Old 02-16-2014, 07:44 PM   #10
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Flushing the cooling system completely is always a good idea. Like was said, flush and back flush the core then open the Petcock on the bottom of the radiator and flush it with a garden hose. Refill and bleed the air from the system.
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Old 02-16-2014, 08:09 PM   #11
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I've flushed my whole system new coolant new 195 degree thermostat the gauge reads 210 had the heater box out and no air leaks and I know mine doesn't get that warm still all my vent doors work correct and everything

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