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replacement engine cooling problem

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
1997 - 2000 S70, S70 AWD
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1997 - 2000 V70-XC
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Rocket99
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replacement engine cooling problem

Post by Rocket99 » Thu Jun 18, 2020 12:51 pm

Super pretty 2000 V70 AWD 56 engine blew a head gasket, I Just got a replacement 56 engine running has 72K miles by car fax, runs real smooth. Also new radiator OEM Volvo.

If I start it cold, let it idle for 30 to 40 min. it will boil the coolant. Its not registered so I'm not driving on the road. I need to get cooling working right with prolonged idle, right?

I do not hear the auxiliary fan come on (I assume it has one, I'm new to Volvo).

The dash temp gauge seems to display plausable temp, though it moves around quite a bit in a strange way

current fed to the radiator fan does make it rotate, it has two wires plus a ground feeding it. I should use the ground and one of the red or green, those are probably two speeds.

The engine installer no longer has my confidence. So I'll try to sort this out.

I just ordered the coolant temp sensor from Volvo, its on the thermostat housing and has a short wire that plugs into a wire close by.

What do you engine guys think,????

failure of radiator fan?

How to check the coolant system pressure on a volvo????

Thanks in advance

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volvolugnut
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volvolugnut

Re: replacement engine cooling problem

Post by volvolugnut » Thu Jun 18, 2020 1:33 pm

Did you get the air out of coolant system and refill the overflow tank? It has to run a while to purge air and the tank level will drop quite a lot. Repeated squeezing of the top radiator hose will help get the air out.
Is the serpentine belt in place to drive the water pump? The electric fan does not run all the time. It has to get hot first. Try turning on the air conditioner. The AC may force the fan on hot or not.
Coolant pressure can be tested with a pressure adapter cap like other engines. If you have a spare cap, you can drill the cap and tap for 1/4 pipe thread and attach a gauge.
volvolugnut
2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple parts cars.

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abscate

Re: replacement engine cooling problem

Post by abscate » Thu Jun 18, 2020 2:37 pm

If the temp gauge doesn’t go to 3 o’clock and stay there, there is a problem

Try that new Volvo engine coolant temp sensor first.
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Rocket99
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Re: replacement engine cooling problem

Post by Rocket99 » Fri Jun 19, 2020 10:48 am

Drained coolant and poured it back in according to Haynes procedure, slowly, with much tube squeezing.

Ran it up to heat, it did not blow out the cap this time. The level of coolant in the return tank did rise a bit above its previous level.

Progress???

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Re: replacement engine cooling problem

Post by Rocket99 » Fri Jun 19, 2020 11:11 am

It blow off coolant again. Turned on AC, cooling fan never ran.

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Re: replacement engine cooling problem

Post by Rocket99 » Fri Jun 19, 2020 2:11 pm

Got coolant system pressure test, pumped up zero until I screwed on a new cap onto the reservoir. Bingo. Right up to 20 psi immediately. How long must that hold ??

Then idled the motor until temp was 3 pm on gauge, zero rise in coolant temp.

Is that normal, correct?

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scot850

Re: replacement engine cooling problem

Post by scot850 » Fri Jun 19, 2020 4:26 pm

3pm is the normal running temp on the coolant gauge. Engine coolant may rise a bit when running but the biggest change often comes when you switch the engine off and the fan (some versions the fan runs for a while after the engine is switched off to reduce expansion of the coolant). If it doesn't the coolant will expand and overflow.

When I fill these engines I put the car on jack stands at the front before filling it and then so the rest of the procedure. I find it reduces the number of burps the engine does.

If the fan does not come on at all it could be the fan relay is not fitted correctly or has failed.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
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1997 Volvo 850 SE NA - Went to niece in California - Sold
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Re: replacement engine cooling problem

Post by misha » Fri Jun 19, 2020 4:44 pm

Rocket99 wrote:
Fri Jun 19, 2020 11:11 am
...Turned on AC, cooling fan never ran.
If it is low on freon,compressor will not kick in and cooling fan will not run.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
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'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

Rocket99
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Rocket99

Re: replacement engine cooling problem

Post by Rocket99 » Sun Jun 21, 2020 9:12 am

Thanks all you folks for your feedback and good ideas.

One knowledgeable person suggested the engine my be no good and coolant pressure test would reveal if it has blown gasket pushing hot gasses into coolant.

Does the coolant pressure test mean this is not the case,
1. ie it did not pump up pressure at all until I put a new coolant reservoir cap, then it pumped up to 20 psi immediately. It did leak down very slowly, I heard an slight pressure leak from the coolant reservoir so a replacement is on the way from volvo.

2. Secondly watching the coolant pressure as it warmed up from cold to normal" 3 pm" on the gauge (at idle only, not driving the car around). it did not develop any increase in coolant pressure.

are those two factors "right" for a fully functional engine?
Last edited by Rocket99 on Mon Jun 22, 2020 7:46 am, edited 1 time in total.

scot850
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scot850

Re: replacement engine cooling problem

Post by scot850 » Sun Jun 21, 2020 10:22 am

I would say yes. The cap pressure is 15psi if I recall correctly on the header tank.

The coolant can be tested for exhaust gases with a test kit. Some of the larger parts stores may rent the kit.

Have you heard the fan kick in yet at any point? If it is not then that may be your problem as suggested before.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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