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post #1 of 18 Old 11-29-2017, 06:49 AM Thread Starter
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95 Acclaim running hot or normal?

1995 Plymouth Acclaim 2.5L

I just picked up this car a week or so ago. Replaced the entire cooling system as a previous mechanic had made a mess of things. Got it all replaced and bled out with no issues.

When driving it seems to run hot to me, but I've never had a 4cyl in one of these so idk if it's normal or not?
It climbs to there on the gauge, then the thermostat opens and it drops to just above half, then slowly climbs back.

94 Voyager: 3.3L/4-speed swapped, Off-Road Mini
95 Acclaim: Mild 3.0/a604 swapped, originally 2.5/3-speed.
92 Caravan: Stock 3.0/3-spd, 69k orig mi.
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post #2 of 18 Old 11-29-2017, 07:03 AM
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Re: 95 Acclaim running hot or normal?

I'd say that's "high-normal" for the 2.5L. Both of mine tend to float low-to-mid on their gauges when warmed up (a tad over halfway in traffic and about the 30% mark while moving). This is for my Sundance and Daytona 2.5L engines.

Just for fun I'd swap out the sending unit on the front of the head. Very quick & inexpensive.
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post #3 of 18 Old 11-29-2017, 07:07 AM Thread Starter
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Re: 95 Acclaim running hot or normal?

I will try that first.

It rides in that 1/2 to pictured range regardless of where I'm driving it. It never goes over where I showed, never goes under 1/2.
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post #4 of 18 Old 11-29-2017, 08:48 AM
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Re: 95 Acclaim running hot or normal?

I would suggest swaping senders.
and just for good preventative maintainence.
swap in a 180* thermo. they are like 10$. and drill it for the bubble/bleed hole.

Flush the system before you change the thermo. use some CLR in the system for about a hour and leave it over night.
Then drain it and flush it with a hose. put in the good thermostat and call it a day.


ALSO start the car. let it get warm and idle. then unplug the coolant sensor on the side of the thermostat block.
Make sure the fan is coming on.
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post #5 of 18 Old 11-29-2017, 09:05 AM Thread Starter
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Re: 95 Acclaim running hot or normal?

Quote:
Originally Posted by masterjr3333 View Post
I would suggest swaping senders.
and just for good preventative maintainence.
swap in a 180* thermo. they are like 10$. and drill it for the bubble/bleed hole.

Flush the system before you change the thermo. use some CLR in the system for about a hour and leave it over night.
Then drain it and flush it with a hose. put in the good thermostat and call it a day.


ALSO start the car. let it get warm and idle. then unplug the coolant sensor on the side of the thermostat block.
Make sure the fan is coming on.
Going to swap senders. If that doesn't change anything I am going to snag a different gauge cluster as I recall having a similar issue on my 3.0 Acclaim, which ended up being a fried cluster.

Already been through the entire cooling system, flushed, new radiator, new water pump, new hoses, new 192* thermostat (with bleed hole drilled), flushed again and refilled.
Fans work as they should.
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post #6 of 18 Old 11-30-2017, 05:35 AM
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Re: 95 Acclaim running hot or normal?

The gauges are not accurate, in the summer my gauge reads to the 3/4 mark before the fan cycles on, in the cold weather the gauge never reads above 1/4 although actual coolant temp is the same.

I DO NOT recommend installing a 180 T-Stat.
The engine will run cooler which uses more fuel and is less efficient.
I DO recommend the 195 T-Stat and drilling the 1/8" bleed hole at the 12 o'clock position in the T-Stat flange.

There was also a TSB put out by Chrysler explaining coolant temp gauge fluctuation.

Before replacing more parts why not verify actual cooling system temp by backprobing the CTS and reading the voltage when the fan cycles on and off.

BACKPROBING CTS/CHECKING ENGINE TEMP
95 Acclaim running hot or normal?-backprobing-cts.jpg

95 Acclaim running hot or normal?-cts-voltage-chart-2.jpg

CHRYSLER TSB
95 Acclaim running hot or normal?-5-cooling-system-tsb.jpg

DRAINING AND REFILLING COOLING SYSTEM
95 Acclaim running hot or normal?-cooling-system-drain-refill-1.jpg

95 Acclaim running hot or normal?-cooling-system-drain-refill-2.jpg
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post #7 of 18 Old 11-30-2017, 06:20 AM Thread Starter
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Re: 95 Acclaim running hot or normal?

Well the problem made itself apparent leaving work last night.

The head gasket let fly when I was getting ready to leave last night. Guessing it was leaking enough to heat up the cooling system, leading to my hot readings.

Going to change the HG and try again. Anything to be wary of?

Thanks all for your quick responses.
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post #8 of 18 Old 11-30-2017, 08:22 AM
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Re: 95 Acclaim running hot or normal?

head gaskets are EZ PZ on a TBI.

half a day job while drinking beer and jerking around.
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post #9 of 18 Old 11-30-2017, 09:05 AM Thread Starter
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Re: 95 Acclaim running hot or normal?

Quote:
Originally Posted by masterjr3333 View Post
head gaskets are EZ PZ on a TBI.

half a day job while drinking beer and jerking around.
I figured they gotta be easier than the 3.0s. I got those down to 6hrs

I'll order the gasket set, $under $20 thru Rock, and probably tackle it next weekend.
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post #10 of 18 Old 11-30-2017, 09:09 AM
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Re: 95 Acclaim running hot or normal?

Agreed. Do a good cleaning on everything. May want to coat the head gasket with copper spray just to make sure it doesn't seep.

Only point to watch is the head bolts. Check them with a straight edge to make sure they aren't deformed and over-stretched. When you do the torque sequence, when you get to the final 90* turn, set your torque wrench to 90 lb-ft. If the head bolt doesn't hit that before you get to 90*, it's a junk bolt. If you decide to replace them, Felpro's are hit or miss on quality. Genuine Mopar bolts are available on ebay, but you should be fine re-using the stockers on a tbi motor...

One other item, buy a real Mopar valve cover seal. The Felpro's aren't the right size & leak. Found that out the hard way.... Felpro head gaskets are fine.

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post #11 of 18 Old 11-30-2017, 11:16 AM Thread Starter
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Re: 95 Acclaim running hot or normal?

Quote:
Originally Posted by 83scamp View Post
Agreed. Do a good cleaning on everything. May want to coat the head gasket with copper spray just to make sure it doesn't seep.

Only point to watch is the head bolts. Check them with a straight edge to make sure they aren't deformed and over-stretched. When you do the torque sequence, when you get to the final 90* turn, set your torque wrench to 90 lb-ft. If the head bolt doesn't hit that before you get to 90*, it's a junk bolt. If you decide to replace them, Felpro's are hit or miss on quality. Genuine Mopar bolts are available on ebay, but you should be fine re-using the stockers on a tbi motor...

One other item, buy a real Mopar valve cover seal. The Felpro's aren't the right size & leak. Found that out the hard way.... Felpro head gaskets are fine.
I was looking at the Victor Reinz set https://www.rockauto.com/en/moreinfo...228283&jsn=588
I've had good luck with the VR head gasket sets.
It comes with new head bolts, so I will replace them.
I may reuse the valve cover gasket that's on it as it was just replaced less than 2k ago, I'll see how it looks.
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post #12 of 18 Old 11-30-2017, 12:48 PM
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Re: 95 Acclaim running hot or normal?

Quote:
Originally Posted by 6g72 acclaim View Post
I was looking at the Victor Reinz set https://www.rockauto.com/en/moreinfo...228283&jsn=588
I've had good luck with the VR head gasket sets.
It comes with new head bolts, so I will replace them.
I may reuse the valve cover gasket that's on it as it was just replaced less than 2k ago, I'll see how it looks.
I wouldn't use the VR head gasket set. Never tried one because of all the bad stuff I've heard. VR is usually good stuff, but for some reason, they can't get it right for the 2.2/2.5. At least that's what I've been told over the years.

MP, Cometic, or Felpro are the only 3 that have ever been recommended to me. Now that's from the turbo guys. I guess if you do decide to try it, let us know.
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post #13 of 18 Old 11-30-2017, 03:04 PM Thread Starter
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Re: 95 Acclaim running hot or normal?

Quote:
Originally Posted by 83scamp View Post
I wouldn't use the VR head gasket set. Never tried one because of all the bad stuff I've heard. VR is usually good stuff, but for some reason, they can't get it right for the 2.2/2.5. At least that's what I've been told over the years.

MP, Cometic, or Felpro are the only 3 that have ever been recommended to me. Now that's from the turbo guys. I guess if you do decide to try it, let us know.
I guess I'll find out, already ordered.
I guess at worst if it looks like it doesn't match well I send it back and get the FP set.
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post #14 of 18 Old 12-01-2017, 12:54 PM
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Re: 95 Acclaim running hot or normal?

Quote:
Originally Posted by NAJ View Post

I DO NOT recommend installing a 180 T-Stat.
The engine will run cooler which uses more fuel and is less efficient.
I DO recommend the 195 T-Stat and drilling the 1/8" bleed hole at the 12 o'clock position in the T-Stat flange.

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post #15 of 18 Old 12-01-2017, 06:19 PM
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Re: 95 Acclaim running hot or normal?

Some helpful info you may need while performing your head gasket replacement.

First a Caution...
Do NOT use 3M Roloc Particle Discs to clean the Head/Deck Surfaces.
If the material from the disc gets into the oil it will destroy the rod/main bearings in short order.
https://www.3m.com/3M/en_US/company-...3242240&rt=rud

DO use 3M Bristle Discs.
https://www.3m.com/3M/en_US/company-...3223502&rt=rud

If you are going to check the head/deck for flatness the spec is .005 max variation using a flat edge and a feeler gauge.

Run a tap/thread chaser into the cylinder head bolt holes in the deck to be sure all threads are clean, blow out the hole using brake cleaner and air.
This will ensure the proper torque on all head bolts.

SETTING CAM AND IGNITION TIMING
https://www.turbododge.com/forums/f4/...n-84-95-a.html

95 Acclaim running hot or normal?-specs-engine-torque.jpg

95 Acclaim running hot or normal?-engine-2.2l-2.5l-cylinder-head-1.jpg

95 Acclaim running hot or normal?-engine-2.2l-2.5l-cylinder-head-2.jpg

95 Acclaim running hot or normal?-engine-2.2l-2.5l-stationary-bracket.jpg

95 Acclaim running hot or normal?-engine-2.2l-2.5l-timing-belt-1.jpg

95 Acclaim running hot or normal?-engine-2.2l-2.5l-timing-belt-2.jpg

95 Acclaim running hot or normal?-engine-2.2l-2.5l-timing-belt-4.jpg

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