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Old 01-21-2016, 12:07 PM
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Jeep does not blow hot air when throttle isn't pressed

Hello, the heating in my 2006 Jeep Grand Cherokee 4.7 Laredo is acting a bit weird lately, it takes longer to start and blows cold air if I’m not pressing on gas. Could this be a thermostat problem?

Also, the steering wheel does a half inch turn to the right when I’m driving slowly, as I can feel the tires turning and bumping over something slowly, like it’s trying to pull to the right. Could it need an alignment?

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Old 01-22-2016, 03:35 AM
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Re: Jeep does not blow hot air when throttle isn't pressed

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Originally Posted by Laredo2006 View Post
Hello, the heating in my 2006 Jeep Grand Cherokee 4.7 Laredo is acting a bit weird lately, it takes longer to start and blows cold air if Iím not pressing on gas. Could this be a thermostat problem?

Also, the steering wheel does a half inch turn to the right when Iím driving slowly, as I can feel the tires turning and bumping over something slowly, like itís trying to pull to the right. Could it need an alignment?


Does the temp gauge go up and stay in the proper operating range normally? Without more intel, I'd start with the water pump, if the impeller has become detached or isn't working properly it won't provide adequate pressure to circulate your coolant. This could be why it changes with RPM's. I'm assuming you've already done a visual inspection and have found no visible leaks? Thermostat is a possibility, but with your symptoms it doesn't seem too likely. The steering/ride issues sound like a possible separated tire, depending on the type and location it can cause some strange symptoms. You probably wouldn't notice it much at higher speeds, but at lower speeds it can translate into a pull or thumping feeling in the wheel if its a front tire. Another thing to consider is if your Jeep is a full time 4wd, you won't be able to just replace the one tire unless you can find an exact match to your other 3 (make, model, tread depth within 3/32"). The awd system requires certain tolerances in tires, read up on it in your owners manual or online. Feel free to post back with any questions or concerns, hope this helps.
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Old 01-28-2016, 02:22 PM
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Hi there,

Temp gauge is normal. Water pump was replaced 3 years ago, but at a local garage maybe they didn't install it correctly? It used to leak.

Not sure if I have a seperated tire. These winter tires are a bit old...maybe I'm inflating them too much? I was told I needed an alignment I believe last year.
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Old 01-30-2016, 02:44 PM
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Re: Jeep does not blow hot air when throttle isn't pressed

The pump could've failed already, I've seen them be anywhere from DOA and up. If it's not the pump, maybe a partial blockage somewhere? Have you ever replaced your coolant? Have you or anyone else serviced your cooling system lately? Trapped air could sometimes cause weird issues like this if the system wasn't purged of air when it was opened up. As far as the tires go, you should have them inspected. A separation can show up in all kinds of ways, may not even be visible to the untrained eye or without the proper diagnostic equipment. The alignment wouldn't cause they symptoms you're experiencing, wouldn't hurt to have done, but you shouldn't expect it to solve the issue. If there is a bad tire, the alignment machine could actually be thrown off so keep that in mind as well. Is it warm where you live? By that I mean in the winter when your snow tires are on do you experience warmer temps often? Snow tires are made of a different compound than all season tires are, they're a softer blend to promote traction and stay pliable in the cold temps. The downside to that is when they're used in warmer temps (40į+) they wear excessively and can develop tread separations. If you don't notice anything with a visual inspection, I'd recommend taking to a tire dealer for inspection, not sure where you live but usually the tire centers will perform a quick visual for no charge. Let me know what comes of it all, good luck.
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Old 02-01-2016, 04:29 PM
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Hey there. It was a tire seperation so I found a used toyo geo2 plus and changed it. Thanks. For the heating issue, coolant was changed 35000 miles ago. Garage said it's probably thermostat. Wants $130 to replace it.
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Old 02-01-2016, 10:03 PM
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Re: Jeep does not blow hot air when throttle isn't pressed

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Originally Posted by Laredo2006 View Post
Hey there. It was a tire seperation so I found a used toyo geo2 plus and changed it. Thanks. For the heating issue, coolant was changed 35000 miles ago. Garage said it's probably thermostat. Wants $130 to replace it.

Is that tire a match to your set? It could be the thermostat, which should've been replaced when the shop did your coolant, it's about a $10 part and super easy to replace but you have to drain the coolant to do it as it's on the low side of the block, well below all water lines. I'm not sure how proficient you are in the garage or mechanically but it's not a difficult task to undertake. The $130 quote is all labor I assume, they won't be $10 into the job in parts, assuming they reuse your coolant which is still good after only 35k. Let me know if you're going to do it yourself and if you want some pointers or step advice. Glad you got the tire issue squared away.
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Old 02-09-2016, 10:15 AM
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Hi again, yes I was lucky enough to find an exact used tire as the ones I have.

New developments:

Driving to work this morning I got a check gauges alert and noticed the engine temp was at maximum. I opened the heating and it dropped by a quarter. I was at a red light when all this was happening. Cold air started coming out even though I'd already driven 10 miles. When the light turned to green and I pressed on the gaz the temp dropped by another quarter to half before climbing back up to 3/4's.

Maybe I had put too much water in the coolant mix last year? Guy at garage did tell me thermostat looked like it had leaked some coolant. I did a coolant flush 30000 miles ago. Should I do another one and change the thermostat as well?

Guy at the garage said he would start with that. Should I have them check the water pump or something else? Or is there any test I can do to know what the real problem is?

Thanks.
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Old 02-09-2016, 03:47 PM
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Re: Jeep does not blow hot air when throttle isn't pressed

Was your system bled properly when the coolant was done? If there was any air left in the system, it can do strange things, like inconsistent heat flow and engine temp mgmt, etc... Do you ever hear a "sloshing" type sound originating from behind the glove box area when you accelerate from an idle? There's a bleed plug on the aluminum neck that your upper rad hose connects to, it's a flush mounted Allen key plug. You can start by just cracking that when the motor is @ operating temp, DO NOT remove it all the way, the system will be under pressure and the coolant will be hot! Just crack it about 1/4-1/2 turn, or until it starts seeping water, and watch for bubbles. Once it's solid fluid, tighten it back down. Be sure to do this on a level surface, the objective is to release any trapped air that may've been left in the system and had collected at the plug (high point in system). If no air present, or just a negligible amount, I would just replace the pump, thermostat and coolant. Do it all at once as just trying to do piece work here can be counter productive, the pump and thermostat are both wear items that should be replaced periodically, no sense in wasting time and money doing just the coolant when you'll have to do it again to replace said parts. The little bit of extra $ you'll spend on parts is minimal, especially compared to the possible catastrophic failure you could experience if you get that motor too hot. The shop that did your coolant previously should've at least mentioned the thermostat and probably the pump, the thermostat is such a cheap part but one that is critical in your cooling system, I opt to replace them almost any time I break into a cooling system. If you're taking a diy approach to the job, check out Rockauto.com for parts, usually the best price to be found and they have a ton of selection. I'd go with a new unit for the pump, a recon unit is not worth the monetary savings in this instance. You can also just check your local parts stores, may not be worth the online order if the cost is comparable after shipping and such. Also be sure to get the proper coolant, check your manual for specs but if I remember correctly, the only aftermarket supplier is Zerex G-05, but you can research that on your own, just look for an HOAT coolant. Hope this all helps, feel free to ask if you have any other questions.
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Old 02-10-2016, 06:28 PM
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Hi. Read all your advice and thanks. We checked a few things and changed the thermostat and flushed and replaced the coolant and everything seems fine now. There was a bit of gunk in the coolant and mechanic said if it happens again will need a new head gasket...like 850$ US. ..

What pisses me off is that they used a non hoat I believe light green type of coolant when I checked. I will call the manager tomorrow. Manual says to use hoat. Why the hell would these clowns use prestone non hoat???
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Old 02-11-2016, 12:17 AM
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Re: Jeep does not blow hot air when throttle isn't pressed

Quote:
Originally Posted by Laredo2006 View Post
Hi. Read all your advice and thanks. We checked a few things and changed the thermostat and flushed and replaced the coolant and everything seems fine now. There was a bit of gunk in the coolant and mechanic said if it happens again will need a new head gasket...like 850$ US. ..

What pisses me off is that they used a non hoat I believe light green type of coolant when I checked. I will call the manager tomorrow. Manual says to use hoat. Why the hell would these clowns use prestone non hoat???

That gunk you're describing is almost certainly due to the use of incorrect coolant, that's what happens in our blocks when not using the HOAT. You've gotta be selective when choosing a mechanic to work on your rig, sounds like these guys aren't the most intelligent or diligent in their work. If I were you I'd talk to the manager and demand that they do a complete chemical flush of your entire system, block and all, and replace your water pump and coolant (with the proper type this time) all at no charge to you. Or get a quote for that job from your local Jeep dealer and tell the independent shop that they can pay for it because you're not comfortable with trusting them to do the job correctly. Just dumping that fluid and replacing with the HOAT is not enough at this point, there is still conventional coolant that has remained in the system and undoubtedly some deposits of the "gunk" trapped in various locations, could even be restricting or completely blocking some water jackets and will lead to larger problems down the road. Until the system is completely flushed and clean, it'll never truly be decontaminated. Another point of interest is the water they used to dilute the coolant mix, did they use distilled water only as they're supposed to or did they just grab the garden hose and use tap water? That can be another issue as the minerals and chemicals in standard tap water will cause scaly deposits and buildup, just compounding the issues. You shouldn't let this go, and the cooling system needs to be addressed, just because there is correct fluid in there now does NOT mean all is well. Be diligent, they messed this up, they need to make it right. Keep me apprised and let me know if I can help further.
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