Jump to content
  • When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

High engine temperature


DrA76

Recommended Posts

Some years ago when my '69 was my winter daily driver (I know...bad, bad me, but I had no choice!) I noticed that for the first 4-5 miles on the freeway my temp gauge would climb up to about 2 o'clock, even with the heater going full blast (in the 20s-30s outside).  Then all of a sudden the gauge would drop to 4 o'clock, then gradually come back up to its normal 3 o'clock about the time I reached work.  

 

After watching that phenomenon for a week or two, I pulled off to the side of the road while the gauge was reading high, and felt the hoses around the thermostat.  Sure enough, the 'stat wasn't opening until it really got hot, then it went from fully closed to fully open all at once--instead of gradually. I swapped out the thermostat and all was back to normal. 

 

So if you've ruled out more common problems like a loose alternator/water pump belt, poorly grounding temp gauge sensor (it grounds through the threads so make sure they're clean), or a vacuum leak, you might check the hoses around the thermostat to see if it's opening properly.

 

mike

 

PS--if the gauge itself is flickering or jumping--and especially if the gas gauge is doing it too, then you have a faulty ground at the gauge end.  Lots of posts on the FAQ on how to fix that.

  • Like 1
  • Thanks 1

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

Link to comment
Share on other sites

My recent experience was a crudded-up radiator.  I took it to the local shop, he opened it up, rodded out the core, cleaned the tanks, then reassembled.  Cooling returned to normal.

     The radiator guy said it had more-than-plenty junk in the lower tank and the core.

 

I also installed a new thermostat, just because it was so easy to accomplish.  No reason not to.

 

Cheers,

 

Carl

 

Link to comment
Share on other sites

Also check your timing. 
Not enough advance when fully warmed up will cause engine to run hot. The later cars are especially sensitive to this if fitted with the dual pod distributor (vac advance and retard). The black electro valve allows advance only when the coolant temperature is cold. When car gets warm, the vac retard kicks in. If vac lines are not installed correctly and/or static timing is wrong … your timing can be too retarded = hot!

Been there….done that. 🤓

John

  • Like 2
  • Thanks 1
Link to comment
Share on other sites

4 hours ago, DrA76 said:

I flush the radiator. Checked all grounds. 

While driving gauge at 3 o'clock

In traffic 2 .

That's not completely abnormal.  When I'm in traffic, my gauge reads about 2:30--and that's with a 3 row core radiator, an 80 degree thermostat and an A/C condenser in front of the radiator.  

 

So depending on the air temperature and which thermostat you have, and presuming your gauge is reading accurately, you're not too far off.  Since you have a '76, there should be a shroud around the fan to assist air flow, as those cars are burdened with a thermal reactor exhaust manifold that generates a lot of extra heat, putting a strain on an already marginal (for the US) cooling system.  If you have A/C, even more.  

 

If you're not in CA--or another mis-benighted state that visually inspects emission controls, pitch that manifold into the neighbor's pool and install a "regular" exhaust manifold.  Your engine will run cooler, and the extra weight of the thermal reactor manifold won't put additional strain on the exhaust manifold studs, which weren't designed for that extra weight.  

 

mike

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

Link to comment
Share on other sites

11 hours ago, John76 said:

82 degrees at 6:45 AM ?

Don't think @DrA76 is in CA. 

We are having record rain and cold (north and south). 

My idea that CA (at least the southern part) is always warm has just been shattered (not really, I found out first hand about LA's "June Glooms.")

 

But I still bet it's warmer in CA than here in OH...

 

mike

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • BMW Neue Klasse - a birth of a Sports Sedan

    BMW Neue Klasse - a birth of a Sports Sedan

    Unveiling of the Neue Klasse Unveiled in 1961, BMW 1500 sedan was a revolutionary concept at the outset of the '60s. No tail fins or chrome fountains. Instead, what you got was understated and elegant, in a modern sense, exciting to drive as nearly any sports car, and yet still comfortable for four.   The elegant little sedan was an instant sensation. In the 1500, BMW not only found the long-term solution to its dire business straits but, more importantly, created an entirely new
    History of the BMW 2002 and the 02 Series

    History of the BMW 2002 and the 02 Series

    In 1966, BMW was practically unknown in the US unless you were a touring motorcycle enthusiast or had seen an Isetta given away on a quiz show.  BMW’s sales in the US that year were just 1253 cars.  Then BMW 1600-2 came to America’s shores, tripling US sales to 4564 the following year, boosted by favorable articles in the Buff Books. Car and Driver called it “the best $2500 sedan anywhere.”  Road & Track’s road test was equally enthusiastic.  Then, BMW took a cue from American manufacturers,
    The BMW 2002 Production Run

    The BMW 2002 Production Run

    BMW 02 series are like the original Volkswagen Beetles in one way (besides both being German classic cars)—throughout their long production, they all essentially look alike—at least to the uninitiated:  small, boxy, rear-wheel drive, two-door sedan.  Aficionados know better.   Not only were there three other body styles—none, unfortunately, exported to the US—but there were some significant visual and mechanical changes over their eleven-year production run.   I’ve extracted t
  • Upcoming Events

  • Supporting Vendors

×
×
  • Create New...