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pt cruiser overheating issue

 
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Old 30 May 2012, 02:54 am
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Default pt cruiser overheating issue

My cruiser started running a little bit hot a couple of months ago, but not overheat, meaning 3/4 of the way up on the gauge. I thought it might be the thermostat, so I changed the thermostat, but did the same thing but worse barely made it home after 10 miles or so, before it got back to the 3/4 mark. Then I found out the low speed wasn't working on the fan, so I traced that down and found out it was the fan motor, replaced it and now the fans work good, but runs hot if I drive it still, can only get about a mile or 2 down the road, tried bleeding it a couple of times, but have the same result. It will sit and idle and not run hot, but as soon as I go down the road and get it above 60 and then let off it wants to run hot. Do you think it might be the radiator being clogged up? I don't think its the water pump cuz heater blows hot air ( I read that if it does that then water pump is still good) and I don't have any coolant loss, other than me trying to bleed the system.
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Old 30 May 2012, 06:04 am
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Default Re: pt cruiser overheating issue

If the radiator is clogged or partially clogged, yes, that will stop/delay coolant from running around and cooling the engine and when your up to speed, that's when you need the full flow of coolant, so your guess could be right.
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Old 30 May 2012, 06:09 am
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Default Re: pt cruiser overheating issue

do you have pressure in the top radiator hose? Is it hot to the touch? If so you have at least some circulation going on. Make sure you keep the overflow bottle at the full hot mark. I think the system should bleed itself after a few start/stop/hot/cool down cycles
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Old 30 May 2012, 11:59 am
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Default Re: pt cruiser overheating issue

There's pressure on the top hose when the thermostat opens, but not when cold. When the engine is hot, is the entire radiator suppose to be hot as well or just the tanks? Also did a bit of an experiment, I took the thermostat out and see if it would do the same thing ( I know its bad to run without a stat) It did do the same thing. It acted the same as when it was in there, didn't run cooler or anything even sitting in the driveway which to me is confusing. I even took it down the road without the stat and it started running hot just like before. That would have to be a bad water pump or radiator wouldn't it?

Last edited by 05pt_cruiser; 30 May 2012 at 12:04 pm.
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Old 30 May 2012, 12:11 pm
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Default Re: pt cruiser overheating issue

Does seem either radiator is plugged or water pump isn't pumping.
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Old 30 May 2012, 02:10 pm
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Default Re: pt cruiser overheating issue

Remove both radiator hoses and see if water from garden hose will freely flow out bottom bung.

A bad headgasket will pump engine full of air instead of coolant.

PT's have (except turbos) a metal pump impeller- It's next to impossible for it not to pump,
and, you showed it was pumping as the heater works.

Take cap off and see how low coolant is.
Sometimes you can see a constant stream of bubbles at idle if headgasket is leaking

You can have coolant tested for combustion gasses
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