Question about 1987 Porsche 944

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1984 944 Porsche - Overheating

Alright, what I've done:
Replaced water pump
Replace radiator
Replace thermostat
Replace fans
Replace fan temperature switch
Replace upper hose (twice) and lower hose
New timing belts
and the car is still overheating. I am in the process of draining out the coolant and flushing the system then refilling to see if there is a change. Has anyone ever had this much of a problem with this type of car. Any ideas or thoughts would be great. As well as the fact that I have had to get two going on three upper hoses. The hose continues to drag on a belt pully. Any thoughts on how to correct this misdirected system? I think that I will stop here for now to see what kind of feedback there is.

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  • wolvesrus1 Jun 16, 2009

    Thank you to both of the replies so far. I will be continuing the work throughout the week and probably some of the weekend. Thanks again.

  • yadayada
    yadayada May 11, 2010

    leaking head gaskets are your problem.

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Did you replace the heater core? Does your heater work when you turn it on full, with fan. What I'm getting at is your control to the heater stuck open an blocked. Also believe it or not if your heater is fully functioning you can cool your engine somewhat by turning the heat on inside the car, thus increasing the surface area for heat dissipation. Try a back flush of your entire cooling system.

Posted on Jun 16, 2009

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As far as the hose goes, try turning it so it pulls away from the pully, then tighten it. If you've done all that work, and you're still overheating, I would start to look at a blown head gasket. If your head gasket is blown, you will have a mucky substance, or coolant on your oil dipstick. If not, then the flow journals in the engine are severely clogged. If it ends up being flow journals, you will need to disassemble the engine and have it hot tanked.

Posted on Jun 16, 2009

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I have a 944 that had a similar problem. actually turned out to be the fan relay under the dashboard. The fans would not turn on at all, but if they ever actually did they would run till the battery went dead. You might want to check the relay that is under there and make sure that it is seated good, and functions properly.

Posted on Jul 27, 2009

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A-You have not mention the fan clutch replacement, I assumed that you see the fan turn before the electric fan kicked in.
B- Do you lose a lot of water?
C-Do you open the oil cap to observe the milky stuff as a result of moisture mixing with oil coming from a blown head gasket?

If not
To find out any blockage in your water jacket you can test as following.
1- Remove the Thermostate.
2- By pass the heater core by installing a hose by pass the cooling path in and out of heater core.
3- Run the engine for a while the same time with an eye on temperature gauge.
4- Touching the upper hose you can feel the water flowing to conclude if your water circulated or not.

If everything OK.
Take out the Bypass heater core
Let the cooling path flow as it designed (but not putting Thermostate back)
Run again to see if there is a temp problem. This will eliminate the heater core blockage. The rest is easy to determine. Good luck. I'll check back to see how thing is going.

Posted on Jul 05, 2009

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Have you checked your heater core for leaks? If not it could be a problem with your over heating. Also try a different coolant to water ratio mixture. For instance if you are using a 50-50 try a 60 coolant to 40 water. That might help keep your engine a little cooler

Posted on Jun 17, 2009

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