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no heat? no overheating

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
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

NYCKID221
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NYCKID221

no heat? no overheating

Post by NYCKID221 » Thu Feb 21, 2019 9:11 pm

its my project what can it be? i changed the thermostat last year and flushed the heatercore
previous owner did timing waterpump.

if i start the car and leave it running for 10/15mins or so and then put the heat on
it gets low heat for 5sec or so and then blows cold even if i rev the motor

edited: the top hose when car is running i can press on it and its warm but empty :(



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abscate
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abscate

Re: no heat???????no overheating

Post by abscate » Thu Feb 21, 2019 9:27 pm

The blend door dampers are lazy to not working

You can read EcC codes with a good scanner


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NYCKID221
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NYCKID221

Re: no heat???????no overheating

Post by NYCKID221 » Thu Feb 21, 2019 9:44 pm

my uni scanner was stolen from my brothers car / other scanners i have are for bmw and mercedes and vw


but would that cause the top hose to be empty?



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scot850

Re: no heat???????no overheating

Post by scot850 » Thu Feb 21, 2019 11:06 pm

How do you know the top hose is empty?

It may be you have a bad thermostat or an air-lock.

When you refilled the coolant, did you raise the front of the car to help the system burp with the header tank cap off?

Neil.


2000 V70 R - still being an endless PITA
2006 XC70
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abscate
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abscate

Re: no heat???????no overheating

Post by abscate » Fri Feb 22, 2019 5:05 am

Feel close to the metal pipes near the driver feet ( you might have to pull out the trim section) to see if it’s hot or air locked. It will burn you if at full temp so be careful.

That will sort out if it’s a damper or coolant issue


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NYCKID221
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NYCKID221

Re: no heat???????no overheating

Post by NYCKID221 » Fri Feb 22, 2019 4:15 pm

scot850 wrote:
Thu Feb 21, 2019 11:06 pm
How do you know the top hose is empty?

It may be you have a bad thermostat or an air-lock.

When you refilled the coolant, did you raise the front of the car to help the system burp with the header tank cap off?

Neil.
stat is brandnew
top hose is empty from pressing on it



NYCKID221
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NYCKID221

Re: no heat???????no overheating

Post by NYCKID221 » Fri Feb 22, 2019 4:27 pm

abscate wrote:
Fri Feb 22, 2019 5:05 am
Feel close to the metal pipes near the driver feet ( you might have to pull out the trim section) to see if it’s hot or air locked. It will burn you if at full temp so be careful.

That will sort out if it’s a damper or coolant issue
which pipes are you talking about?



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tardcart

Re: no heat???????no overheating

Post by tardcart » Fri Feb 22, 2019 5:01 pm

If the water level is very low, it won't circulate into the heater core. The last thing that happens before you over heat is no heat situation. Im not familiar with the 98 tank fill situation, but it goes into the radiator I think. If you haven't run it since a block drain, you have to run it for ten minutes and shut it off to cool. then it will pull coolant from the tank. It won't go in by gravity. It take sever cycles to illuminate all air. So you may be right that the hose feels empty.



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abscate
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abscate

Re: no heat???????no overheating

Post by abscate » Fri Feb 22, 2019 7:16 pm

Pull the foot trim above the pedals and you will see two metal pipes that deliver coolant to/ from the heater core


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wizechatmgr

Re: no heat? no overheating

Post by wizechatmgr » Sun Feb 24, 2019 5:52 am

Did they offer ECC for that year folks? If so, it sounds a lot like when I had the A->D converters blow which would show all 0's for the motor positions. They would sweep and then leave the blender doors in the full cold position.


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1999 V70 XC AWD - ~177k miles

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