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Still overheating even after water pump

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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oragex
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Re: Still overheating even after water pump

Post by oragex » Tue Nov 15, 2016 10:27 am

When it overheats, how hot is the lower drivers side radiator hose? Also, does the engine ping uphill?

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Re: Still overheating even after water pump

Post by broken08 » Tue Nov 15, 2016 12:51 pm

I always run premium in my turbo cars. Can't imagine not doing that.

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Re: Still overheating even after water pump

Post by tryingbe » Tue Nov 15, 2016 5:04 pm

During those hill climbs, what was your speed, what's your engine vacuum/boost number and do you have a/c on?
85 GLH, 367 whp
00 Insight, 72 mpg

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Re: Still overheating even after water pump

Post by broken08 » Tue Nov 15, 2016 6:48 pm

tryingbe wrote:During those hill climbs, what was your speed, what's your engine vacuum/boost number and do you have a/c on?
Really just cruising gently around 55, boost between 0 and 3 but mostly 0. No a.c.

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Re: Still overheating even after water pump

Post by tryingbe » Tue Nov 15, 2016 9:48 pm

Radiator is probably bad.

I had to flush with CLR since no one makes a radiator for a TII turbo dodge.

This is what came out.

Image

Image
85 GLH, 367 whp
00 Insight, 72 mpg

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Re: Still overheating even after water pump

Post by abscate » Wed Nov 16, 2016 5:32 am

The best way to diagnose a blocked radiator is to use an IR thermal gun and map the temperature of the radiator from top to bottom
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Re: Still overheating even after water pump

Post by broken08 » Mon Nov 28, 2016 9:22 pm

UPDATE:

I went big and replaced the coolant cap, heater core, and the radiator, got an OEM thermostat in there too. Did a full flush, put in 50/50 pentofrost NF. Burped the system a couple times through heat cycling. Then I took it on a longer, harder test drive and it successfully kept temps below 225!!
I was so excited. Until I opened the hood and saw that the fluid had boiled out of the reservoir like before.
I'm at a total loss now. I guess all I can assume is that the head gasket is blown in such a way that only under serious boost it pressurizes the cooling system? In which case it's just time to push this POS off a cliff and say goodbye most likely.

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Re: Still overheating even after water pump

Post by broken08 » Mon Nov 28, 2016 9:23 pm

Note; it NEVER smokes

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Re: Still overheating even after water pump

Post by kahl » Mon Nov 28, 2016 9:57 pm

You have eliminated the usual suspects. I would check timing. Set the front cams to the notches in the plastic then pull the distributor and the cam position sensor to see if the cam shafts in the rear line up. Came across similar issues several years ago on a neighbors 97 850 turbo after he did timing belt and cam seals. Car was fine while idling and the temp was fine, but under load the temp needle would climb. I can't remember the particulars but one cam had to clockwise and the other cam counter clockwise.

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Re: Still overheating even after water pump

Post by theWIFES_S70 » Mon Nov 28, 2016 10:50 pm

kahl wrote:You have eliminated the usual suspects. I would check timing. Set the front cams to the notches in the plastic then pull the distributor and the cam position sensor to see if the cam shafts in the rear line up. Came across similar issues several years ago on a neighbors 97 850 turbo after he did timing belt and cam seals. Car was fine while idling and the temp was fine, but under load the temp needle would climb. I can't remember the particulars but one cam had to clockwise and the other cam counter clockwise.
This is such a crazy post... Sounds like the car is possessed or something! :(

Kahl, how would timing affect the pressurization of the engine?

If this is boost and coolant pressurization-related, have all the lines that have coolant running through them been inspected? I imagine all the coolant hoses have been checked. What about the coolant lines to the turbo? Could it be a defective cap? There are so many different kinds of resevoir caps... Good luck.
1998 Volvo S70, N/A, 5-speed, 183K
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